Re: [CentOS] IP range
On 02/08/2012 22:45, Scott Silva wrote: snip Nope Work only .49 and .50 I bought 8 public IP-s ... so 8 IPs have to get work. In the hosting specification this IPs is usable with xxx.xxx.xxx.48-55 with subnet mask 255.255.255.255 with no gateway. As I sad, works perfectly with this command (8 times, of course :) ): #ifconfig eth:(0 to 7) xxx.xxx.xxx.(48-55) netmask 255.255.255.255 Thanks Levi It doesn't work that way... You may think you bought 8 ip's, but you can only pass traffic on 6... That is how it works... You buy 16, and only 14 work. The first and last address are as Johnny said... http://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos Thank you all for your time ... But I have another question: Why is a difference in setting up with icfg-eth0:0 and ifconfig ? As I sad, setting up all 8 IP-s with ifconfig works perfectly. Why if I specify explicitly the subnet mask in ifcfg-eth0:0 then appear other? Thanks Levi ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IP range
[For the archives, since I think Johnny just hit the wrong number key.] On Thursday, August 02, 2012 10:24:27 AM Johnny Hughes wrote: If you want 8 usable addresses (including the Network number, a gateway address, and a Broadcast address), that would mean you need at least 11 IPs in that subnet ... the closest fit would be a 255.255.255.240 subnet (which has 16 addresses). If you were to want to use th 255.255.255.240 subnet, then 192.168.1.48 would not be available as it would the the Network number for that subnet ... the usable addresses would be 192.168.1.49-63 that case and the Broadcast Address would be 192.168.1.64 192.168.1.63 would be the correct broadcast address; .64 would be the network address of the next subnet. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IP range
On 08/03/2012 08:54 AM, Lamar Owen wrote: [For the archives, since I think Johnny just hit the wrong number key.] On Thursday, August 02, 2012 10:24:27 AM Johnny Hughes wrote: If you want 8 usable addresses (including the Network number, a gateway address, and a Broadcast address), that would mean you need at least 11 IPs in that subnet ... the closest fit would be a 255.255.255.240 subnet (which has 16 addresses). If you were to want to use th 255.255.255.240 subnet, then 192.168.1.48 would not be available as it would the the Network number for that subnet ... the usable addresses would be 192.168.1.49-63 that case and the Broadcast Address would be 192.168.1.64 192.168.1.63 would be the correct broadcast address; .64 would be the network address of the next subnet. Indeed ... Thanks Lamar :-) signature.asc Description: OpenPGP digital signature ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] IP range
Hi all Can someone explain me this: ifcfg-eth0-range1: ONBOOT=yes IPADDR_START=192.168.1.48 IPADDR_END=192.168.1.55 CLONENUM_START=1 Why Bcast is 192.168.1.51 and why Mask is 255.255.255.252 ? OS: Centos 6.3/64bit Thanks Levi # ifconfig eth0:1Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.48 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:2Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.49 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:3Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.50 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:4Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.51 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:5Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.52 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:6Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.53 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:7Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.54 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:8Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.55 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IP range
On 02.08.2012 15:00, Birta Levente wrote: Hi all Can someone explain me this: ifcfg-eth0-range1: ONBOOT=yes IPADDR_START=192.168.1.48 IPADDR_END=192.168.1.55 CLONENUM_START=1 Why Bcast is 192.168.1.51 and why Mask is 255.255.255.252 ? OS: Centos 6.3/64bit Thanks Levi # ifconfig eth0:1Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.48 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:2Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.49 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:3Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.50 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:4Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.51 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:5Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.52 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:6Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.53 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:7Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.54 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:8Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.55 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos You can (and are encouraged) to specify the NETMASK as well in that range file. I don't know why it uses that mask and broadcast; maybe it inherits them from other already configures interface? -- Sent from the Delta quadrant using Borg technology! Nux! www.nux.ro ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IP range
From: Birta Levente blevi.li...@gmail.com Can someone explain me this: ifcfg-eth0-range1: ONBOOT=yes IPADDR_START=192.168.1.48 IPADDR_END=192.168.1.55 CLONENUM_START=1 Why Bcast is 192.168.1.51 and why Mask is 255.255.255.252 ? Never used ifcfg-eth0-range, but did you try 49 to 54 instead of 48 to 55? $ ipcalc 192.168.1.48/29 Address: 192.168.1.48 1100.10101000.0001.00110 000 Netmask: 255.255.255.248 = 29 ...1 000 Wildcard: 0.0.0.7 ...0 111 = Network: 192.168.1.48/29 1100.10101000.0001.00110 000 HostMin: 192.168.1.49 1100.10101000.0001.00110 001 HostMax: 192.168.1.54 1100.10101000.0001.00110 110 Broadcast: 192.168.1.55 1100.10101000.0001.00110 111 Hosts/Net: 6 Class C, Private Internet JD ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IP range
On 08/02/2012 09:00 AM, Birta Levente wrote: Hi all Can someone explain me this: ifcfg-eth0-range1: ONBOOT=yes IPADDR_START=192.168.1.48 IPADDR_END=192.168.1.55 CLONENUM_START=1 Why Bcast is 192.168.1.51 and why Mask is 255.255.255.252 ? OS: Centos 6.3/64bit Thanks Levi # ifconfig eth0:1Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.48 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:2Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.49 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:3Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.50 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:4Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.51 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:5Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.52 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:6Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.53 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:7Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.54 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:8Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.55 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 That is obviously not going to work ... a 255.255.255.252 mask is a 4 IP subnet, with only 2 usable addresses and a network number and a broadcast address. The only free addresses in 192.168.1.48/255.255.255.252 are .49 and .50 The Broadcast and Mask settings are likely in your ifcfg-eth0 file and not in the range file at all. The Mask would either be set manually in ifcfg-eth0 ... or by the DHCP server if you get DHCP. The Broadcast address would automatically be set based on the Mask, unless it is overridden in ifcfg-eth0. If the address is set via DHCP, you need to change the subnet mask on the DHCP server as that is where it comes from. If you want 8 usable addresses (including the Network number, a gateway address, and a Broadcast address), that would mean you need at least 11 IPs in that subnet ... the closest fit would be a 255.255.255.240 subnet (which has 16 addresses). If you were to want to use th 255.255.255.240 subnet, then 192.168.1.48 would not be available as it would the the Network number for that subnet ... the usable addresses would be 192.168.1.49-63 that case and the Broadcast Address would be 192.168.1.64 Since this is on a private network, why are you not just using the full 192.168.1.0 network with a 255.255.255.0 subnet? I guess the real question is, what are you trying to do :D signature.asc Description: OpenPGP digital signature ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IP range
On 02/08/2012 17:24, Johnny Hughes wrote: On 08/02/2012 09:00 AM, Birta Levente wrote: Hi all Can someone explain me this: ifcfg-eth0-range1: ONBOOT=yes IPADDR_START=192.168.1.48 IPADDR_END=192.168.1.55 CLONENUM_START=1 Why Bcast is 192.168.1.51 and why Mask is 255.255.255.252 ? OS: Centos 6.3/64bit Thanks Levi # ifconfig eth0:1Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.48 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:2Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.49 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:3Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.50 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:4Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.51 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:5Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.52 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:6Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.53 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:7Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.54 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:8Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.55 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 That is obviously not going to work ... a 255.255.255.252 mask is a 4 IP subnet, with only 2 usable addresses and a network number and a broadcast address. The only free addresses in 192.168.1.48/255.255.255.252 are .49 and .50 The Broadcast and Mask settings are likely in your ifcfg-eth0 file and not in the range file at all. The Mask would either be set manually in ifcfg-eth0 ... or by the DHCP server if you get DHCP. The Broadcast address would automatically be set based on the Mask, unless it is overridden in ifcfg-eth0. If the address is set via DHCP, you need to change the subnet mask on the DHCP server as that is where it comes from. If you want 8 usable addresses (including the Network number, a gateway address, and a Broadcast address), that would mean you need at least 11 IPs in that subnet ... the closest fit would be a 255.255.255.240 subnet (which has 16 addresses). If you were to want to use th 255.255.255.240 subnet, then 192.168.1.48 would not be available as it would the the Network number for that subnet ... the usable addresses would be 192.168.1.49-63 that case and the Broadcast Address would be 192.168.1.64 Since this is on a private network, why are you not just using the full 192.168.1.0 network with a 255.255.255.0 subnet? I guess the real question is, what are you trying to do :D ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos I have eth0 with public IP, netmask is 255.255.255.252. Additionally I own 8 public IPs xxx.xxx.xxx.48-55 with class subnet mask 255.255.255.248 If I set up with ifconfig eth:(0 to 7) xxx.xxx.xxx.(48-55) netmask 255.255.255.255 it's work. But if I set up the ifcfg-eth0:(0-7) files with the same IP and netmask it's not work. ifconfig show me the 255.255.255.252 netmask even if in file other netmask is specified. The same situation in ifcfg-eth0-range1 case. Thanks Levi ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IP range
On 08/02/2012 09:33 AM, Birta Levente wrote: On 02/08/2012 17:24, Johnny Hughes wrote: On 08/02/2012 09:00 AM, Birta Levente wrote: Hi all Can someone explain me this: ifcfg-eth0-range1: ONBOOT=yes IPADDR_START=192.168.1.48 IPADDR_END=192.168.1.55 CLONENUM_START=1 Why Bcast is 192.168.1.51 and why Mask is 255.255.255.252 ? OS: Centos 6.3/64bit Thanks Levi # ifconfig eth0:1Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.48 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:2Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.49 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:3Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.50 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:4Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.51 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:5Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.52 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:6Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.53 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:7Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.54 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:8Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.55 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 That is obviously not going to work ... a 255.255.255.252 mask is a 4 IP subnet, with only 2 usable addresses and a network number and a broadcast address. The only free addresses in 192.168.1.48/255.255.255.252 are .49 and .50 The Broadcast and Mask settings are likely in your ifcfg-eth0 file and not in the range file at all. The Mask would either be set manually in ifcfg-eth0 ... or by the DHCP server if you get DHCP. The Broadcast address would automatically be set based on the Mask, unless it is overridden in ifcfg-eth0. If the address is set via DHCP, you need to change the subnet mask on the DHCP server as that is where it comes from. If you want 8 usable addresses (including the Network number, a gateway address, and a Broadcast address), that would mean you need at least 11 IPs in that subnet ... the closest fit would be a 255.255.255.240 subnet (which has 16 addresses). If you were to want to use th 255.255.255.240 subnet, then 192.168.1.48 would not be available as it would the the Network number for that subnet ... the usable addresses would be 192.168.1.49-63 that case and the Broadcast Address would be 192.168.1.64 Since this is on a private network, why are you not just using the full 192.168.1.0 network with a 255.255.255.0 subnet? I guess the real question is, what are you trying to do :D ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos I have eth0 with public IP, netmask is 255.255.255.252. Additionally I own 8 public IPs xxx.xxx.xxx.48-55 with class subnet mask 255.255.255.248 If I set up with ifconfig eth:(0 to 7) xxx.xxx.xxx.(48-55) netmask 255.255.255.255 it's work. But if I set up the ifcfg-eth0:(0-7) files with the same IP and netmask it's not work. ifconfig show me the 255.255.255.252 netmask even if in file other netmask is specified. The same situation in ifcfg-eth0-range1 case. What if you do this: ifcfg-eth0-range1: ONBOOT=yes IPADDR_START=192.168.1.49 IPADDR_END=192.168.1.54 CLONENUM_START=1 BROADCAST=192.168.1.55 NETMASK=255.255.255.248 NETWORK=192.168.1.48 (with a .248 subnet, you can not use the first address (192.168.1.48) or the last address (192.168.1.55) on a device, they are the Network Address and the Broadcast Address ... so an 8 IP subnet has 6 usable addresses. Also, one of those 6 addresses will also need to be assigned to the gateway router if you need to talk to another network, so you really only have 5 addresses that you can assign for use). signature.asc
Re: [CentOS] IP range
On 02/08/2012 17:52, Johnny Hughes wrote: On 08/02/2012 09:33 AM, Birta Levente wrote: On 02/08/2012 17:24, Johnny Hughes wrote: On 08/02/2012 09:00 AM, Birta Levente wrote: Hi all Can someone explain me this: ifcfg-eth0-range1: ONBOOT=yes IPADDR_START=192.168.1.48 IPADDR_END=192.168.1.55 CLONENUM_START=1 Why Bcast is 192.168.1.51 and why Mask is 255.255.255.252 ? OS: Centos 6.3/64bit Thanks Levi # ifconfig eth0:1Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.48 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:2Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.49 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:3Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.50 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:4Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.51 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:5Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.52 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:6Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.53 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:7Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.54 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 eth0:8Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.55 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee-fbf0 That is obviously not going to work ... a 255.255.255.252 mask is a 4 IP subnet, with only 2 usable addresses and a network number and a broadcast address. The only free addresses in 192.168.1.48/255.255.255.252 are .49 and .50 The Broadcast and Mask settings are likely in your ifcfg-eth0 file and not in the range file at all. The Mask would either be set manually in ifcfg-eth0 ... or by the DHCP server if you get DHCP. The Broadcast address would automatically be set based on the Mask, unless it is overridden in ifcfg-eth0. If the address is set via DHCP, you need to change the subnet mask on the DHCP server as that is where it comes from. If you want 8 usable addresses (including the Network number, a gateway address, and a Broadcast address), that would mean you need at least 11 IPs in that subnet ... the closest fit would be a 255.255.255.240 subnet (which has 16 addresses). If you were to want to use th 255.255.255.240 subnet, then 192.168.1.48 would not be available as it would the the Network number for that subnet ... the usable addresses would be 192.168.1.49-63 that case and the Broadcast Address would be 192.168.1.64 Since this is on a private network, why are you not just using the full 192.168.1.0 network with a 255.255.255.0 subnet? I guess the real question is, what are you trying to do :D ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos I have eth0 with public IP, netmask is 255.255.255.252. Additionally I own 8 public IPs xxx.xxx.xxx.48-55 with class subnet mask 255.255.255.248 If I set up with ifconfig eth:(0 to 7) xxx.xxx.xxx.(48-55) netmask 255.255.255.255 it's work. But if I set up the ifcfg-eth0:(0-7) files with the same IP and netmask it's not work. ifconfig show me the 255.255.255.252 netmask even if in file other netmask is specified. The same situation in ifcfg-eth0-range1 case. What if you do this: ifcfg-eth0-range1: ONBOOT=yes IPADDR_START=192.168.1.49 IPADDR_END=192.168.1.54 CLONENUM_START=1 BROADCAST=192.168.1.55 NETMASK=255.255.255.248 NETWORK=192.168.1.48 (with a .248 subnet, you can not use the first address (192.168.1.48) or the last address (192.168.1.55) on a device, they are the Network Address and the Broadcast Address ... so an 8 IP subnet has 6 usable addresses. Also, one of those 6 addresses will also need to be assigned to the gateway router if you need to talk to another
Re: [CentOS] IP range
From: Birta Levente blevi.li...@gmail.com I bought 8 public IP-s ... so 8 IPs have to get work. In the hosting specification this IPs is usable with xxx.xxx.xxx.48-55 with subnet mask 255.255.255.255 with no gateway. As I sad, works perfectly with this command (8 times, of course :) ): #ifconfig eth:(0 to 7) xxx.xxx.xxx.(48-55) netmask 255.255.255.255 So maybe you do not want to (or cannot) use an ifcfg range file and just use 1 eth0 file + 7 alias files... JD ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IP range
snip Nope Work only .49 and .50 I bought 8 public IP-s ... so 8 IPs have to get work. In the hosting specification this IPs is usable with xxx.xxx.xxx.48-55 with subnet mask 255.255.255.255 with no gateway. As I sad, works perfectly with this command (8 times, of course :) ): #ifconfig eth:(0 to 7) xxx.xxx.xxx.(48-55) netmask 255.255.255.255 Thanks Levi It doesn't work that way... You may think you bought 8 ip's, but you can only pass traffic on 6... That is how it works... You buy 16, and only 14 work. The first and last address are as Johnny said... http://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IP range
On Thu, Aug 02, 2012 at 12:45:46PM -0700, Scott Silva wrote: It doesn't work that way... You may think you bought 8 ip's, but you can only pass traffic on 6... That is how it works... You buy 16, and only 14 work. The first and last address are as Johnny said... It very much depends on if he bought a routed subnet or bought 8 individual IPs. It's very possible the OP _does_ have 8 IPs to play with but, because it's not a subnet, he may need to configure them individually. (I had a friend who bought 4 IPs from BellAtlantic DSL in the late 90s that were 4 available IPs and not a routed subnet; his OpenBSD firewall machine would proxy-arp for the Windows machines sitting behind it) -- rgds Stephen ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IP range
On 08/02/12 12:45 PM, Scott Silva wrote: It doesn't work that way... You may think you bought 8 ip's, but you can only pass traffic on 6... That is how it works... You buy 16, and only 14 work. The first and last address are as Johnny said... I've also seen DSL networks like this where those extra IPs are bridged not routed. in these cases, you use the same gateway as the 'main' IP, but usually the main IP has a /24 or whatever mask that encompasses ALL the IPs. regardless, the OP should contact the ISP and find out what the mask and gateway are for the extra IPs. -- john r pierceN 37, W 122 santa cruz ca mid-left coast ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IP range
on 8/2/2012 12:54 PM John R Pierce spake the following: On 08/02/12 12:45 PM, Scott Silva wrote: It doesn't work that way... You may think you bought 8 ip's, but you can only pass traffic on 6... That is how it works... You buy 16, and only 14 work. The first and last address are as Johnny said... I've also seen DSL networks like this where those extra IPs are bridged not routed. in these cases, you use the same gateway as the 'main' IP, but usually the main IP has a /24 or whatever mask that encompasses ALL the IPs. regardless, the OP should contact the ISP and find out what the mask and gateway are for the extra IPs. I guess with the ipv4 drought, this will become even more common... Until everyone gets to ipv6... ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] ip range cidr calculator
I found a command-line program that did this once before, used it for a while and then forgot about it until right now and I'll be damned if I can find it again. A command line IP calculator that takes an address range and give it back in cidr format. I found an online one that does this here: http://www.ipaddresslocation.org/subnet-mask-calculator.php But I would prefer to have the commandline one back again. Does anyone know what it's called and where it can be found? -- MELVILLE THEATRE ~ Melville Sask ~ http://www.melvilletheatre.com ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] ip range cidr calculator
On Fri, Dec 25, 2009 at 05:05:53PM -0600, Frank Cox wrote: Does anyone know what it's called and where it can be found? /bin/ipcalc - part of the initscripts package. John -- If man does find the solution for world peace it will be the most revolutionary reversal of his record we have ever known. -- George C. Marshall (1880 - 1959), American military leader and statesman, creator of the Marshall Plan, the only US Army general to receive the Nobel Peace Prize, Biennial Report of the Chief of Staff, US Army, 1 September 1945 pgpO2a8JmpZZ0.pgp Description: PGP signature ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] ip range cidr calculator
I found a command-line program that did this once before, used it for a while and then forgot about it until right now and I'll be damned if I can find it again. A command line IP calculator that takes an address range and give it back in cidr format. I found an online one that does this here: http://www.ipaddresslocation.org/subnet-mask-calculator.php But I would prefer to have the commandline one back again. Does anyone know what it's called and where it can be found? I like the one at http://jodies.de/ipcalc-archive/ipcalc-0.41/ipcalc which also gives Cisco wildcard masks as well as all the other useful things. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] ip range cidr calculator
On Fri, 2009-12-25 at 17:14 -0600, Barry Brimer wrote: I like the one at http://jodies.de/ipcalc-archive/ipcalc-0.41/ipcalc which also gives Cisco wildcard masks as well as all the other useful things. I'm pretty sure this is the one that I was using before. Thanks loads for the help. -- MELVILLE THEATRE ~ Melville Sask ~ http://www.melvilletheatre.com ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] ip range cidr calculator
On Fri, 2009-12-25 at 17:09 -0600, John R. Dennison wrote: Does anyone know what it's called and where it can be found? /bin/ipcalc - part of the initscripts package. As far as I can tell, that one doesn't do ranges (from a.b.c.0 to a.b.e.255 stuff). At least, if it does I haven't figured out the magic incantation to get it to do that. The one that Barry posted here does ranges. I'm pretty sure it's the same one that I was using before. This time I have put it into a directory that I'm not likely to lose. Thanks for the help. -- MELVILLE THEATRE ~ Melville Sask ~ http://www.melvilletheatre.com ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] ip range cidr calculator
On Fri, Dec 25, 2009 at 05:41:29PM -0600, Frank Cox wrote: As far as I can tell, that one doesn't do ranges (from a.b.c.0 to a.b.e.255 stuff). At least, if it does I haven't figured out the magic incantation to get it to do that. No, it indeed does not. My brain skipped over the part of your original post that specified you wanting to do ranges. I blame all the food consumed today :( The one that Barry posted here does ranges. I'm pretty sure it's the same one that I was using before. Also available in the epel repo if you want it in rpm format. John -- TURKEY, n. A large bird whose flesh when eaten on certain religious anniversaries has the peculiar property of attesting piety and gratitude. Incidentally, it is pretty good eating. -- Ambrose Bierce, The Devil's Dictionary pgpPQctks2Epz.pgp Description: PGP signature ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] IP range of Google Analytics server farm
Hi Centos Users I would like to allow outgoing traffic to Google Analytics servers (destination port 80). I wish to do a iptables rule. How to whitelist all Google Analytics servers? cheers Simon -- XMPP: [EMAIL PROTECTED] ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IP range of Google Analytics server farm
On 11/14/07, Simon Jolle [EMAIL PROTECTED] wrote: Hi Centos Users I would like to allow outgoing traffic to Google Analytics servers (destination port 80). I wish to do a iptables rule. How to whitelist all Google Analytics servers? cheers Simon -- XMPP: [EMAIL PROTECTED] hi...Simon, I thinks you can get your answer at http://www.google.com/support/analytics/ just have a search there -- [EMAIL PROTECTED] True greatness is measured by how much freedom you give to others, not by how much you can coerce others to do what you want. --Larry Wall ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IP range of Google Analytics server farm
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On 11/14/2007 05:01 PM, Shibu C Varughese wrote: hi...Simon, Hi Shibu I thinks you can get your answer at http://www.google.com/support/analytics/ just have a search there I didn't found my answer there. Can you point me to the right page? I wish to add an outgoing iptables rule that allows Google Analytics. cheers Simon - -- actually, I think Windows Vista has done more than virtually any OS release to promote the use of Linux (Slashdot Kommentar, 4. Oct 07) -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFHOzAmEMN/lNE/wrwRArnLAJ9GOWsGeOlIyNvpGaWPQSwSxtDtDgCbB0cI 7ahyQKZZdQAVL9AAiZL2cCs= =JimG -END PGP SIGNATURE- ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IP range of Google Analytics server farm
On 11/14/07, Simon Jolle sjolle [EMAIL PROTECTED] wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On 11/14/2007 05:01 PM, Shibu C Varughese wrote: hi...Simon, Hi Shibu I thinks you can get your answer at http://www.google.com/support/analytics/ just have a search there I didn't found my answer there. Can you point me to the right page? I wish to add an outgoing iptables rule that allows Google Analytics. cheers Simon - -- Simon ... i just searched at the google support page ... this is what they say http://www.google.com/analytics/urchin_software.html If you have content behind a security firewall or on an intranet or internal network that prevents you from using the Google Analytics service, Urchin 5 software is for you. -- [EMAIL PROTECTED] True greatness is measured by how much freedom you give to others, not by how much you can coerce others to do what you want. --Larry Wall ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
