Re: routing help
On Tuesday 27 January 2004 11:57, Demian Wandelow wrote: On Mon, Jan 26, 2004 at 12:59:03PM +0800, Jason Lim wrote: I believe there is a way to force a refresh or such of the ARP cache. Not sure how... but it can be done somehow. I'd be interested to learn the method under Linux as well, so if you find out, share it with the group ip route flush cache No that flushes the routing cache, not the arp cache. With the ip command you'd flush the arp cache with ip neigh flush all, you can also cycle through all arp entries and delete them with arp -d address Original poster's question (sorry lost original mail) ... On Mon, 26 Jan 2004 14:02:21 +1100 Lauchlin wrote: If I simply do ifconfig eth0:1 203.221.41.12 netmask 255.255.255.224 broadcast 203.221.41.3 I can ping the IP address from the machine that is on the same switch (e.g. from 203.221.41.1) but I can not ping or trace to the ip aliased interface. I have searched around on google but can't seem to find what I am doing wrong! Is the router at 203.220.47.153 aware of the 203.221.41.0/27 network? If the router doesn't know about the local 203.221.41.0/27 network it will assume that the network is not local and try to reach it through the Internet. -- Fraser Campbell [EMAIL PROTECTED] http://www.wehave.net/ Georgetown, Ontario, Canada Debian GNU/Linux -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: routing help
On Mon, Jan 26, 2004 at 12:59:03PM +0800, Jason Lim wrote: I believe there is a way to force a refresh or such of the ARP cache. Not sure how... but it can be done somehow. I'd be interested to learn the method under Linux as well, so if you find out, share it with the group :-) ip route flush cache or: sysctl -w net.ipv4.route.flush=n (n = seconds before flush, AFAIK) -- signature: command not found
Re: routing help
On Tuesday 27 January 2004 11:57, Demian Wandelow wrote: On Mon, Jan 26, 2004 at 12:59:03PM +0800, Jason Lim wrote: I believe there is a way to force a refresh or such of the ARP cache. Not sure how... but it can be done somehow. I'd be interested to learn the method under Linux as well, so if you find out, share it with the group ip route flush cache No that flushes the routing cache, not the arp cache. With the ip command you'd flush the arp cache with ip neigh flush all, you can also cycle through all arp entries and delete them with arp -d address Original poster's question (sorry lost original mail) ... On Mon, 26 Jan 2004 14:02:21 +1100 Lauchlin wrote: If I simply do ifconfig eth0:1 203.221.41.12 netmask 255.255.255.224 broadcast 203.221.41.3 I can ping the IP address from the machine that is on the same switch (e.g. from 203.221.41.1) but I can not ping or trace to the ip aliased interface. I have searched around on google but can't seem to find what I am doing wrong! Is the router at 203.220.47.153 aware of the 203.221.41.0/27 network? If the router doesn't know about the local 203.221.41.0/27 network it will assume that the network is not local and try to reach it through the Internet. -- Fraser Campbell [EMAIL PROTECTED] http://www.wehave.net/ Georgetown, Ontario, Canada Debian GNU/Linux
Re: routing help
If it works, don't fix it is my theory.. May be a better way but I don't know it. As Jason Lim says in his post, let the list know what happens as I'm sure others will have the problem. Only change I'd consider is using the up command (man interfaces) which would execute your script after the interface was brought up, instead of on boot. That MIGHT be better. The modification would look like: auto eth0 eth1 iface eth0 inet static address 203.221.41.11 netmask 255.255.255.224 network 203.221.41.0 broadcast 203.221.41.31 up /path/to/your/script You can also, according to the man page, simply put your script directly into /etc/interfaces, preceding each command with up, and the commands would happen in order, ie: auto eth0 eth1 iface eth0 inet static address 203.221.41.11 netmask 255.255.255.224 network 203.221.41.0 broadcast 203.221.41.31 up /sbin/route add -net 203.220.47.152/30 eth0 up /sbin/route add default gw 203.220.47.153 up /bin/ping -c1 203.220.238.152 up /sbin/ifconfig eth0 203.221.41.12 netmask 255.255.255.224 broadcast 203.221.41.31 . . . etc Rod Hi Rod, After a bit more playing and a bit more thinking I finally figured it out..I think What it looks like is that the router I am using as the gateway (203.220.47.153) needed to have its ARP table updated or flushed or something. I don't have control over it so I can't be sure. What I now have is a script that runs after boot time that looks like: /sbin/route add -net 203.220.47.152/30 eth0 /sbin/route add default gw 203.220.47.153 /bin/ping -c1 203.220.238.152 /sbin/ifconfig eth0 203.221.41.12 netmask 255.255.255.224 broadcast 203.221.41.31 /sbin/route add -net 203.220.47.152/30 eth0 /sbin/route add default gw 203.220.47.153 /bin/ping -c1 203.220.238.152 /sbin/ifconfig eth0 203.221.41.13 netmask 255.255.255.224 broadcast 203.221.41.31 /sbin/route add -net 203.220.47.152/30 eth0 /sbin/route add default gw 203.220.47.153 /bin/ping -c1 203.220.238.152 /sbin/ifconfig eth0 203.221.41.11 netmask 255.255.255.224 broadcast 203.221.41.31 /sbin/ifconfig eth0:0 203.221.41.12 netmask 255.255.255.224 broadcast 203.221.41.31 /sbin/ifconfig eth0:1 203.221.41.13 netmask 255.255.255.224 broadcast 203.221.41.31 /sbin/route add -net 203.220.47.152/30 eth0 /sbin/route add default gw 203.220.47.153 /bin/ping -c1 203.220.238.152 it basically cycles through the ip addresses pinging a host on just the other side of the router so it flushes the ARP cache. Does this sound correct or am I totally off the track here? Anyway it is all working now but I guess I'd like to know if what I had to do was correct or not? Cheers, Lauchlin On 26/01/2004, at 2:31 PM, Rod Rodolico wrote: Sorry to be vague, but there was a command I remember once when I had this problem before. Seems like I had to do a route add in /network/interfaces. Seems like there is some parameter to an interface that allows you to execute a command after the interface is brought up, and I had to do a route add . . . . to get it to work. However, I'm doing a similar thing, on my server and the only difference is that my netmask is not 255.255.255.255, mine is 255.255.255.224. The first line in the route output was a host entry that I don't seem to need after all. which I think is incorrect on yours. Maybe it is the fact that your netmask is not correct? Following are the first two entries in my /etc/network/interfaces, and it works just fine. If I read your output correctly, your netmask should be a .224 instead of the .0 I use (since you only have two IP's). auto eth0 iface eth0 inet static address 66.17.131.182 netmask 255.255.255.0 network 66.17.131.0 broadcast 66.17.131.255 gateway 66.17.131.1 auto eth0:0 iface eth0:0 inet static address 66.17.131.183 netmask 255.255.255.0 auto eth0 eth1 iface eth0 inet static address 203.221.41.11 netmask 255.255.255.224 network 203.221.41.0 broadcast 203.221.41.31 is what I have. Of course, I could be 100% wrong, in which case someone here will correct me. Rod Hi, I have an issue with routing that I just can't figure out. What I have at the moment is a box set up with an IP and route as follows (some of the details have route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 203.221.41.11 0.0.0.0 255.255.255.255 UH0 0 0 eth0 203.220.47.152 0.0.0.0 255.255.255.252 U 0 0 0 eth0 203.221.41.00.0.0.0 255.255.255.224 U 0 0 0 eth0 0.0.0.0 203.220.47.153 0.0.0.0 UG0 0 0 eth0 eth0 Link encap:Ethernet HWaddr 00:05:1C:0B:48:A8 inet addr:203.221.41.11 Bcast:203.221.41.31 Mask:255.255.255.224 As can be seen from above the
routing help
Hi, I have an issue with routing that I just can't figure out. What I have at the moment is a box set up with an IP and route as follows (some of the details have route -n Kernel IP routing table Destination Gateway Genmask Flags Metric RefUse Iface 203.221.41.11 0.0.0.0 255.255.255.255 UH0 00 eth0 203.220.47.152 0.0.0.0 255.255.255.252 U 0 00 eth0 203.221.41.00.0.0.0 255.255.255.224 U 0 00 eth0 0.0.0.0 203.220.47.153 0.0.0.0 UG0 00 eth0 eth0 Link encap:Ethernet HWaddr 00:05:1C:0B:48:A8 inet addr:203.221.41.11 Bcast:203.221.41.31 Mask:255.255.255.224 As can be seen from above the default route is set up to go to a gateway on a static route. What I want to do is add an ip alias to eth0 with an ip address of 203.221.41.12 and have it route out through the same gateway. If I simply do ifconfig eth0:1 203.221.41.12 netmask 255.255.255.224 broadcast 203.221.41.3 I can ping the IP address from the machine that is on the same switch (e.g. from 203.221.41.1) but I can not ping or trace to the ip aliased interface. I have searched around on google but can't seem to find what I am doing wrong! Thanks, -- Lauchlin -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: routing help
Sorry to be vague, but there was a command I remember once when I had this problem before. Seems like I had to do a route add in /network/interfaces. Seems like there is some parameter to an interface that allows you to execute a command after the interface is brought up, and I had to do a route add . . . . to get it to work. However, I'm doing a similar thing, on my server and the only difference is that my netmask is not 255.255.255.255, which I think is incorrect on yours. Maybe it is the fact that your netmask is not correct? Following are the first two entries in my /etc/network/interfaces, and it works just fine. If I read your output correctly, your netmask should be a .224 instead of the .0 I use (since you only have two IP's). auto eth0 iface eth0 inet static address 66.17.131.182 netmask 255.255.255.0 network 66.17.131.0 broadcast 66.17.131.255 gateway 66.17.131.1 auto eth0:0 iface eth0:0 inet static address 66.17.131.183 netmask 255.255.255.0 Of course, I could be 100% wrong, in which case someone here will correct me. Rod Hi, I have an issue with routing that I just can't figure out. What I have at the moment is a box set up with an IP and route as follows (some of the details have route -n Kernel IP routing table Destination Gateway Genmask Flags Metric RefUse Iface 203.221.41.11 0.0.0.0 255.255.255.255 UH0 00 eth0 203.220.47.152 0.0.0.0 255.255.255.252 U 0 00 eth0 203.221.41.00.0.0.0 255.255.255.224 U 0 00 eth0 0.0.0.0 203.220.47.153 0.0.0.0 UG0 00 eth0 eth0 Link encap:Ethernet HWaddr 00:05:1C:0B:48:A8 inet addr:203.221.41.11 Bcast:203.221.41.31 Mask:255.255.255.224 As can be seen from above the default route is set up to go to a gateway on a static route. What I want to do is add an ip alias to eth0 with an ip address of 203.221.41.12 and have it route out through the same gateway. If I simply do ifconfig eth0:1 203.221.41.12 netmask 255.255.255.224 broadcast 203.221.41.3 I can ping the IP address from the machine that is on the same switch (e.g. from 203.221.41.1) but I can not ping or trace to the ip aliased interface. I have searched around on google but can't seem to find what I am doing wrong! Thanks, -- Lauchlin -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED] -- Media Ethics is an oxymoron, much like Jumbo Shrimp and Microsoft Works. Not to mention NT Security -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: routing help
Hi Rod, After a bit more playing and a bit more thinking I finally figured it out..I think What it looks like is that the router I am using as the gateway (203.220.47.153) needed to have its ARP table updated or flushed or something. I don't have control over it so I can't be sure. What I now have is a script that runs after boot time that looks like: /sbin/route add -net 203.220.47.152/30 eth0 /sbin/route add default gw 203.220.47.153 /bin/ping -c1 203.220.238.152 /sbin/ifconfig eth0 203.221.41.12 netmask 255.255.255.224 broadcast 203.221.41.31 /sbin/route add -net 203.220.47.152/30 eth0 /sbin/route add default gw 203.220.47.153 /bin/ping -c1 203.220.238.152 /sbin/ifconfig eth0 203.221.41.13 netmask 255.255.255.224 broadcast 203.221.41.31 /sbin/route add -net 203.220.47.152/30 eth0 /sbin/route add default gw 203.220.47.153 /bin/ping -c1 203.220.238.152 /sbin/ifconfig eth0 203.221.41.11 netmask 255.255.255.224 broadcast 203.221.41.31 /sbin/ifconfig eth0:0 203.221.41.12 netmask 255.255.255.224 broadcast 203.221.41.31 /sbin/ifconfig eth0:1 203.221.41.13 netmask 255.255.255.224 broadcast 203.221.41.31 /sbin/route add -net 203.220.47.152/30 eth0 /sbin/route add default gw 203.220.47.153 /bin/ping -c1 203.220.238.152 it basically cycles through the ip addresses pinging a host on just the other side of the router so it flushes the ARP cache. Does this sound correct or am I totally off the track here? Anyway it is all working now but I guess I'd like to know if what I had to do was correct or not? Cheers, Lauchlin On 26/01/2004, at 2:31 PM, Rod Rodolico wrote: Sorry to be vague, but there was a command I remember once when I had this problem before. Seems like I had to do a route add in /network/interfaces. Seems like there is some parameter to an interface that allows you to execute a command after the interface is brought up, and I had to do a route add . . . . to get it to work. However, I'm doing a similar thing, on my server and the only difference is that my netmask is not 255.255.255.255, mine is 255.255.255.224. The first line in the route output was a host entry that I don't seem to need after all. which I think is incorrect on yours. Maybe it is the fact that your netmask is not correct? Following are the first two entries in my /etc/network/interfaces, and it works just fine. If I read your output correctly, your netmask should be a .224 instead of the .0 I use (since you only have two IP's). auto eth0 iface eth0 inet static address 66.17.131.182 netmask 255.255.255.0 network 66.17.131.0 broadcast 66.17.131.255 gateway 66.17.131.1 auto eth0:0 iface eth0:0 inet static address 66.17.131.183 netmask 255.255.255.0 auto eth0 eth1 iface eth0 inet static address 203.221.41.11 netmask 255.255.255.224 network 203.221.41.0 broadcast 203.221.41.31 is what I have. Of course, I could be 100% wrong, in which case someone here will correct me. Rod Hi, I have an issue with routing that I just can't figure out. What I have at the moment is a box set up with an IP and route as follows (some of the details have route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 203.221.41.11 0.0.0.0 255.255.255.255 UH0 0 0 eth0 203.220.47.152 0.0.0.0 255.255.255.252 U 0 0 0 eth0 203.221.41.00.0.0.0 255.255.255.224 U 0 0 0 eth0 0.0.0.0 203.220.47.153 0.0.0.0 UG0 0 0 eth0 eth0 Link encap:Ethernet HWaddr 00:05:1C:0B:48:A8 inet addr:203.221.41.11 Bcast:203.221.41.31 Mask:255.255.255.224 As can be seen from above the default route is set up to go to a gateway on a static route. What I want to do is add an ip alias to eth0 with an ip address of 203.221.41.12 and have it route out through the same gateway. If I simply do ifconfig eth0:1 203.221.41.12 netmask 255.255.255.224 broadcast 203.221.41.3 I can ping the IP address from the machine that is on the same switch (e.g. from 203.221.41.1) but I can not ping or trace to the ip aliased interface. I have searched around on google but can't seem to find what I am doing wrong! Thanks, -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: routing help
it basically cycles through the ip addresses pinging a host on just the other side of the router so it flushes the ARP cache. Does this sound correct or am I totally off the track here? Anyway it is all working now but I guess I'd like to know if what I had to do was correct or not? I believe there is a way to force a refresh or such of the ARP cache. Not sure how... but it can be done somehow. I'd be interested to learn the method under Linux as well, so if you find out, share it with the group :-) -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
routing help
Hi, I have an issue with routing that I just can't figure out. What I have at the moment is a box set up with an IP and route as follows (some of the details have route -n Kernel IP routing table Destination Gateway Genmask Flags Metric RefUse Iface 203.221.41.11 0.0.0.0 255.255.255.255 UH0 00 eth0 203.220.47.152 0.0.0.0 255.255.255.252 U 0 00 eth0 203.221.41.00.0.0.0 255.255.255.224 U 0 00 eth0 0.0.0.0 203.220.47.153 0.0.0.0 UG0 00 eth0 eth0 Link encap:Ethernet HWaddr 00:05:1C:0B:48:A8 inet addr:203.221.41.11 Bcast:203.221.41.31 Mask:255.255.255.224 As can be seen from above the default route is set up to go to a gateway on a static route. What I want to do is add an ip alias to eth0 with an ip address of 203.221.41.12 and have it route out through the same gateway. If I simply do ifconfig eth0:1 203.221.41.12 netmask 255.255.255.224 broadcast 203.221.41.3 I can ping the IP address from the machine that is on the same switch (e.g. from 203.221.41.1) but I can not ping or trace to the ip aliased interface. I have searched around on google but can't seem to find what I am doing wrong! Thanks, -- Lauchlin
Re: routing help
Sorry to be vague, but there was a command I remember once when I had this problem before. Seems like I had to do a route add in /network/interfaces. Seems like there is some parameter to an interface that allows you to execute a command after the interface is brought up, and I had to do a route add . . . . to get it to work. However, I'm doing a similar thing, on my server and the only difference is that my netmask is not 255.255.255.255, which I think is incorrect on yours. Maybe it is the fact that your netmask is not correct? Following are the first two entries in my /etc/network/interfaces, and it works just fine. If I read your output correctly, your netmask should be a .224 instead of the .0 I use (since you only have two IP's). auto eth0 iface eth0 inet static address 66.17.131.182 netmask 255.255.255.0 network 66.17.131.0 broadcast 66.17.131.255 gateway 66.17.131.1 auto eth0:0 iface eth0:0 inet static address 66.17.131.183 netmask 255.255.255.0 Of course, I could be 100% wrong, in which case someone here will correct me. Rod Hi, I have an issue with routing that I just can't figure out. What I have at the moment is a box set up with an IP and route as follows (some of the details have route -n Kernel IP routing table Destination Gateway Genmask Flags Metric RefUse Iface 203.221.41.11 0.0.0.0 255.255.255.255 UH0 00 eth0 203.220.47.152 0.0.0.0 255.255.255.252 U 0 00 eth0 203.221.41.00.0.0.0 255.255.255.224 U 0 00 eth0 0.0.0.0 203.220.47.153 0.0.0.0 UG0 00 eth0 eth0 Link encap:Ethernet HWaddr 00:05:1C:0B:48:A8 inet addr:203.221.41.11 Bcast:203.221.41.31 Mask:255.255.255.224 As can be seen from above the default route is set up to go to a gateway on a static route. What I want to do is add an ip alias to eth0 with an ip address of 203.221.41.12 and have it route out through the same gateway. If I simply do ifconfig eth0:1 203.221.41.12 netmask 255.255.255.224 broadcast 203.221.41.3 I can ping the IP address from the machine that is on the same switch (e.g. from 203.221.41.1) but I can not ping or trace to the ip aliased interface. I have searched around on google but can't seem to find what I am doing wrong! Thanks, -- Lauchlin -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED] -- Media Ethics is an oxymoron, much like Jumbo Shrimp and Microsoft Works. Not to mention NT Security
Re: routing help
Hi Rod, After a bit more playing and a bit more thinking I finally figured it out..I think What it looks like is that the router I am using as the gateway (203.220.47.153) needed to have its ARP table updated or flushed or something. I don't have control over it so I can't be sure. What I now have is a script that runs after boot time that looks like: /sbin/route add -net 203.220.47.152/30 eth0 /sbin/route add default gw 203.220.47.153 /bin/ping -c1 203.220.238.152 /sbin/ifconfig eth0 203.221.41.12 netmask 255.255.255.224 broadcast 203.221.41.31 /sbin/route add -net 203.220.47.152/30 eth0 /sbin/route add default gw 203.220.47.153 /bin/ping -c1 203.220.238.152 /sbin/ifconfig eth0 203.221.41.13 netmask 255.255.255.224 broadcast 203.221.41.31 /sbin/route add -net 203.220.47.152/30 eth0 /sbin/route add default gw 203.220.47.153 /bin/ping -c1 203.220.238.152 /sbin/ifconfig eth0 203.221.41.11 netmask 255.255.255.224 broadcast 203.221.41.31 /sbin/ifconfig eth0:0 203.221.41.12 netmask 255.255.255.224 broadcast 203.221.41.31 /sbin/ifconfig eth0:1 203.221.41.13 netmask 255.255.255.224 broadcast 203.221.41.31 /sbin/route add -net 203.220.47.152/30 eth0 /sbin/route add default gw 203.220.47.153 /bin/ping -c1 203.220.238.152 it basically cycles through the ip addresses pinging a host on just the other side of the router so it flushes the ARP cache. Does this sound correct or am I totally off the track here? Anyway it is all working now but I guess I'd like to know if what I had to do was correct or not? Cheers, Lauchlin On 26/01/2004, at 2:31 PM, Rod Rodolico wrote: Sorry to be vague, but there was a command I remember once when I had this problem before. Seems like I had to do a route add in /network/interfaces. Seems like there is some parameter to an interface that allows you to execute a command after the interface is brought up, and I had to do a route add . . . . to get it to work. However, I'm doing a similar thing, on my server and the only difference is that my netmask is not 255.255.255.255, mine is 255.255.255.224. The first line in the route output was a host entry that I don't seem to need after all. which I think is incorrect on yours. Maybe it is the fact that your netmask is not correct? Following are the first two entries in my /etc/network/interfaces, and it works just fine. If I read your output correctly, your netmask should be a .224 instead of the .0 I use (since you only have two IP's). auto eth0 iface eth0 inet static address 66.17.131.182 netmask 255.255.255.0 network 66.17.131.0 broadcast 66.17.131.255 gateway 66.17.131.1 auto eth0:0 iface eth0:0 inet static address 66.17.131.183 netmask 255.255.255.0 auto eth0 eth1 iface eth0 inet static address 203.221.41.11 netmask 255.255.255.224 network 203.221.41.0 broadcast 203.221.41.31 is what I have. Of course, I could be 100% wrong, in which case someone here will correct me. Rod Hi, I have an issue with routing that I just can't figure out. What I have at the moment is a box set up with an IP and route as follows (some of the details have route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 203.221.41.11 0.0.0.0 255.255.255.255 UH0 0 0 eth0 203.220.47.152 0.0.0.0 255.255.255.252 U 0 0 0 eth0 203.221.41.00.0.0.0 255.255.255.224 U 0 0 0 eth0 0.0.0.0 203.220.47.153 0.0.0.0 UG0 0 0 eth0 eth0 Link encap:Ethernet HWaddr 00:05:1C:0B:48:A8 inet addr:203.221.41.11 Bcast:203.221.41.31 Mask:255.255.255.224 As can be seen from above the default route is set up to go to a gateway on a static route. What I want to do is add an ip alias to eth0 with an ip address of 203.221.41.12 and have it route out through the same gateway. If I simply do ifconfig eth0:1 203.221.41.12 netmask 255.255.255.224 broadcast 203.221.41.3 I can ping the IP address from the machine that is on the same switch (e.g. from 203.221.41.1) but I can not ping or trace to the ip aliased interface. I have searched around on google but can't seem to find what I am doing wrong! Thanks,
Re: routing help
it basically cycles through the ip addresses pinging a host on just the other side of the router so it flushes the ARP cache. Does this sound correct or am I totally off the track here? Anyway it is all working now but I guess I'd like to know if what I had to do was correct or not? I believe there is a way to force a refresh or such of the ARP cache. Not sure how... but it can be done somehow. I'd be interested to learn the method under Linux as well, so if you find out, share it with the group :-)
