224.0.0.251
Hi All, Is there some special meaning (like 127.0.0.1.) to the following IP address? 224.0.0.251 Many thanks, -T
Re: 224.0.0.251
On 23 May 2014 22:02, ToddAndMargo toddandma...@zoho.com wrote: Hi All, Is there some special meaning (like 127.0.0.1.) to the following IP address? 224.0.0.251 Many thanks, -T It is an IP Multicast address. host 224.0.0.251 will tell you a bit more. Alan.
Re: 224.0.0.251
On 05/23/2014 02:08 PM, Alan Bartlett wrote: On 23 May 2014 22:02, ToddAndMargo toddandma...@zoho.com wrote: Hi All, Is there some special meaning (like 127.0.0.1.) to the following IP address? 224.0.0.251 Many thanks, -T It is an IP Multicast address. host 224.0.0.251 will tell you a bit more. Alan. Hi Alan, $ host 224.0.0.251 Host 251.0.0.224.in-addr.arpa. not found: 3(NXDOMAIN) Not sure what I am suppose to find. This is why I ask (VLC's doing): kernel: Vlan-out Everything Else IN= OUT=eth0.5 SRC=192.168.254.10 DST=224.0.0.251 LEN=56 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=UDP SPT=5353 DPT=5353 LEN=36 eth0.5 is a virtual Ethernet too, not hooked to the Internet. And port 3535 UDP? $ grep -i 3535 /etc/services ms-la 3535/tcp# MS-LA ms-la 3535/udp# MS-LA Thank you for the help, -T -- ~~ Computers are like air conditioners. They malfunction when you open windows ~~
Re: 224.0.0.251
On 23 May 2014 22:25, ToddAndMargo toddandma...@zoho.com wrote: On 05/23/2014 02:08 PM, Alan Bartlett wrote: On 23 May 2014 22:02, ToddAndMargo toddandma...@zoho.com wrote: Hi All, Is there some special meaning (like 127.0.0.1.) to the following IP address? 224.0.0.251 Many thanks, -T It is an IP Multicast address. host 224.0.0.251 will tell you a bit more. Alan. Hi Alan, $ host 224.0.0.251 Host 251.0.0.224.in-addr.arpa. not found: 3(NXDOMAIN) Not sure what I am suppose to find. This is why I ask (VLC's doing): kernel: Vlan-out Everything Else IN= OUT=eth0.5 SRC=192.168.254.10 DST=224.0.0.251 LEN=56 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=UDP SPT=5353 DPT=5353 LEN=36 eth0.5 is a virtual Ethernet too, not hooked to the Internet. And port 3535 UDP? $ grep -i 3535 /etc/services ms-la 3535/tcp# MS-LA ms-la 3535/udp# MS-LA Thank you for the help, -T Oops. Typo time. Substitute whois for host. Sorry for the confusion. Alan.
Re: 224.0.0.251
On 05/23/2014 02:39 PM, Alan Bartlett wrote: On 23 May 2014 22:25, ToddAndMargo toddandma...@zoho.com wrote: On 05/23/2014 02:08 PM, Alan Bartlett wrote: On 23 May 2014 22:02, ToddAndMargo toddandma...@zoho.com wrote: Hi All, Is there some special meaning (like 127.0.0.1.) to the following IP address? 224.0.0.251 Many thanks, -T It is an IP Multicast address. host 224.0.0.251 will tell you a bit more. Alan. Hi Alan, $ host 224.0.0.251 Host 251.0.0.224.in-addr.arpa. not found: 3(NXDOMAIN) Not sure what I am suppose to find. This is why I ask (VLC's doing): kernel: Vlan-out Everything Else IN= OUT=eth0.5 SRC=192.168.254.10 DST=224.0.0.251 LEN=56 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=UDP SPT=5353 DPT=5353 LEN=36 eth0.5 is a virtual Ethernet too, not hooked to the Internet. And port 3535 UDP? $ grep -i 3535 /etc/services ms-la 3535/tcp# MS-LA ms-la 3535/udp# MS-LA Thank you for the help, -T Oops. Typo time. Substitute whois for host. Sorry for the confusion. Alan. Hi Alan, Really slick command. Love it! Thank you! :-) I never would have learned this from Google. -T # yum --enablerepo=* whatprovides */whois jwhois-4.0-19.el6.x86_64 : Internet whois/nicname client Repo: sl Matched from: Filename: /usr/bin/whois # yum install jwhois # whois 224.0.0.251 Comment: Addresses starting with a number between 224 and 239 are used for IP multicast. IP multicast is a technology for efficiently sending the same content to multiple destinations. It is commonly used for distributing financial information and video streams, among other things. Comment: A document describing the policies for assigning multicast addresses can be found at: http://datatracker.ietf.org/doc/rfc5771
Re: 224.0.0.251
On 05/23/2014 02:25 PM, ToddAndMargo wrote: This is why I ask (VLC's doing): kernel: Vlan-out Everything Else IN= OUT=eth0.5 SRC=192.168.254.10 DST=224.0.0.251 LEN=56 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=UDP SPT=5353 DPT=5353 LEN=36 eth0.5 is a virtual Ethernet too, not hooked to the Internet. And port 3535 UDP? $ grep -i 3535 /etc/services ms-la 3535/tcp# MS-LA ms-la 3535/udp# MS-LA I wonder why VLC goes out looking on eth0.5? And why port 3535 UDP? $ ip route show 192.168.250.0/24 dev eth1 proto kernel scope link src 192.168.250.133 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 192.168.254.0/24 dev eth0.5 proto kernel scope link src 192.168.254.10 192.168.255.0/24 dev br0 proto kernel scope link src 192.168.255.10 169.254.0.0/16 dev eth1 scope link metric 1003 169.254.0.0/16 dev br0 scope link metric 1004 169.254.0.0/16 dev eth0.5 scope link metric 1005 default via 192.168.250.1 dev eth1 -- ~~ Computers are like air conditioners. They malfunction when you open windows ~~
Re: 224.0.0.251
On 23 May 2014 23:12, ToddAndMargo toddandma...@zoho.com wrote: On 05/23/2014 02:25 PM, ToddAndMargo wrote: This is why I ask (VLC's doing): kernel: Vlan-out Everything Else IN= OUT=eth0.5 SRC=192.168.254.10 DST=224.0.0.251 LEN=56 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=UDP SPT=5353 DPT=5353 LEN=36 eth0.5 is a virtual Ethernet too, not hooked to the Internet. And port 3535 UDP? $ grep -i 3535 /etc/services ms-la 3535/tcp# MS-LA ms-la 3535/udp# MS-LA I wonder why VLC goes out looking on eth0.5? And why port 3535 UDP? $ ip route show 192.168.250.0/24 dev eth1 proto kernel scope link src 192.168.250.133 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 192.168.254.0/24 dev eth0.5 proto kernel scope link src 192.168.254.10 192.168.255.0/24 dev br0 proto kernel scope link src 192.168.255.10 169.254.0.0/16 dev eth1 scope link metric 1003 169.254.0.0/16 dev br0 scope link metric 1004 169.254.0.0/16 dev eth0.5 scope link metric 1005 default via 192.168.250.1 dev eth1 Sorry, I can explain that. :( Perhaps someone else will be able to jump in and assist? Alan.
Re: 224.0.0.251
On 23 May 2014 16:12, ToddAndMargo toddandma...@zoho.com wrote: On 05/23/2014 02:25 PM, ToddAndMargo wrote: This is why I ask (VLC's doing): kernel: Vlan-out Everything Else IN= OUT=eth0.5 SRC=192.168.254.10 DST=224.0.0.251 LEN=56 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=UDP SPT=5353 DPT=5353 LEN=36 eth0.5 is a virtual Ethernet too, not hooked to the Internet. And port 3535 UDP? $ grep -i 3535 /etc/services ms-la 3535/tcp# MS-LA ms-la 3535/udp# MS-LA I wonder why VLC goes out looking on eth0.5? And why port 3535 UDP? $ ip route show 192.168.250.0/24 dev eth1 proto kernel scope link src 192.168.250.133 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 192.168.254.0/24 dev eth0.5 proto kernel scope link src 192.168.254.10 192.168.255.0/24 dev br0 proto kernel scope link src 192.168.255.10 169.254.0.0/16 dev eth1 scope link metric 1003 169.254.0.0/16 dev br0 scope link metric 1004 169.254.0.0/16 dev eth0.5 scope link metric 1005 default via 192.168.250.1 dev eth1 I would expect it is so that you could stream the video etc to multiple desktops at the same time. So if your network supported multicast and you had say a bunch of different stations they could all get the same stream without the linear growth of traffic. Multicast was all the thing in the mid 1990's with universities and such looking at if for their remote learning and entertainment looking to use it for movies and such. The problem is that multicast has all kinds of corner cases which sidelined it because it tended to take out top level routers. Today I believe it is used for small dedicated networks. -- Stephen J Smoogen.
Re: 224.0.0.251
On 05/23/2014 03:37 PM, Stephen John Smoogen wrote: On 23 May 2014 16:12, ToddAndMargo toddandma...@zoho.com mailto:toddandma...@zoho.com wrote: On 05/23/2014 02:25 PM, ToddAndMargo wrote: This is why I ask (VLC's doing): kernel: Vlan-out Everything Else IN= OUT=eth0.5 SRC=192.168.254.10 DST=224.0.0.251 LEN=56 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=UDP SPT=5353 DPT=5353 LEN=36 eth0.5 is a virtual Ethernet too, not hooked to the Internet. And port 3535 UDP? $ grep -i 3535 /etc/services ms-la 3535/tcp# MS-LA ms-la 3535/udp# MS-LA I wonder why VLC goes out looking on eth0.5? And why port 3535 UDP? $ ip route show 192.168.250.0/24 http://192.168.250.0/24 dev eth1 proto kernel scope link src 192.168.250.133 192.168.122.0/24 http://192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 192.168.254.0/24 http://192.168.254.0/24 dev eth0.5 proto kernel scope link src 192.168.254.10 192.168.255.0/24 http://192.168.255.0/24 dev br0 proto kernel scope link src 192.168.255.10 169.254.0.0/16 http://169.254.0.0/16 dev eth1 scope link metric 1003 169.254.0.0/16 http://169.254.0.0/16 dev br0 scope link metric 1004 169.254.0.0/16 http://169.254.0.0/16 dev eth0.5 scope link metric 1005 default via 192.168.250.1 dev eth1 I would expect it is so that you could stream the video etc to multiple desktops at the same time. So if your network supported multicast and you had say a bunch of different stations they could all get the same stream without the linear growth of traffic. Multicast was all the thing in the mid 1990's with universities and such looking at if for their remote learning and entertainment looking to use it for movies and such. The problem is that multicast has all kinds of corner cases which sidelined it because it tended to take out top level routers. Today I believe it is used for small dedicated networks. -- Stephen J Smoogen. Hi Stephen, That explains it. Thank you! -T -- ~~ Computers are like air conditioners. They malfunction when you open windows ~~
Re: 224.0.0.251
On 05/23/2014 06:12 PM, ToddAndMargo wrote: On 05/23/2014 02:25 PM, ToddAndMargo wrote: This is why I ask (VLC's doing): kernel: Vlan-out Everything Else IN= OUT=eth0.5 SRC=192.168.254.10 DST=224.0.0.251 LEN=56 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=UDP SPT=5353 DPT=5353 LEN=36 eth0.5 is a virtual Ethernet too, not hooked to the Internet. The .5 part refers to VLAN 5. This hooked to a virbr should allow the interface to talk to an 802.1q switch connected to your real Ethernet port, meaning you can selectively send the multicasts to interested ports on a LAN (or beyond). Jeff
Re: 224.0.0.251
On 05/23/2014 06:00 PM, Jeff Siddall wrote: On 05/23/2014 06:12 PM, ToddAndMargo wrote: On 05/23/2014 02:25 PM, ToddAndMargo wrote: This is why I ask (VLC's doing): kernel: Vlan-out Everything Else IN= OUT=eth0.5 SRC=192.168.254.10 DST=224.0.0.251 LEN=56 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=UDP SPT=5353 DPT=5353 LEN=36 eth0.5 is a virtual Ethernet too, not hooked to the Internet. The .5 part refers to VLAN 5. This hooked to a virbr should allow the interface to talk to an 802.1q switch connected to your real Ethernet port, meaning you can selectively send the multicasts to interested ports on a LAN (or beyond). Jeff Hi Jeff, Thank you! Nothing is hooked up to eth0.5 at the moment. I only have it around so I can emulate things at a customer's site. -T -- ~~ Computers are like air conditioners. They malfunction when you open windows ~~
