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Multiple IPs
https://forum.linode.com/viewtopic.php?f=19&t=2922		 Page 1 of 1
Author:  lostcarpark [ Thu Nov 08, 2007 3:40 am ]
Post subject:  Multiple IPs
Hi,

I added a second IP, and configured my Linode as described here:

http://www.linode.com/wiki/index.php/Multiple_IPs

When I ping locally (from the Linode itself), I get a response from both IPs, but when I do the same remotely (as in from my own PC), the old IP works fine, but the new one gives me "Request timed out".

When I run ifconfig, it lists the old IP as eth0, and the new one as eth0:1.

My old ip is 64.22.103.10, and the new one is 64.22.103.92.

Thanks for your help!
Author:  pclissold [ Thu Nov 08, 2007 5:05 am ]
Post subject: 
Your second IP looks like it's being blocked by a firewall.
Author:  lostcarpark [ Thu Nov 08, 2007 6:11 am ]
Post subject: 
Ah, of course!

I think I know what to do now.

Thanks.
Author:  lostcarpark [ Thu Nov 08, 2007 3:44 pm ]
Post subject: 
No, I don't. :-(

I don't think I have a firewall configured:

Code:
# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination



This is what I've configured:

Code:
# cat ifcfg-eth0:0
DEVICE=eth0:0
BOOTPROTO=none
ONBOOT=yes
IPADDR=64.22.103.92
NETMASK=255.255.255.0


Any suggestions?
Author:  kangaby [ Thu Nov 08, 2007 5:22 pm ]
Post subject: 
Try changing eth0:0 to eth0:1

I've not seen 0:0 used before (but it may be valid). I use 0:1
Author:  lostcarpark [ Thu Nov 08, 2007 6:10 pm ]
Post subject: 
I had it running as eth0:1, but I changed to to :0. I've changed it back now. Still works locally, but not remotely.

Here's the output from ifconfig:

Code:
# ifconfig
eth0      Link encap:Ethernet  HWaddr FE:FD:40:16:67:0A
          inet addr:64.22.103.10  Bcast:64.22.103.255  Mask:255.255.255.0
          inet6 addr: fe80::fcfd:40ff:fe16:670a/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2696115 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2742679 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:531381736 (506.7 MiB)  TX bytes:1622071325 (1.5 GiB)
          Interrupt:5

eth0:1    Link encap:Ethernet  HWaddr FE:FD:40:16:67:0A
          inet addr:64.22.103.92  Bcast:64.22.103.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:5

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:64841 errors:0 dropped:0 overruns:0 frame:0
          TX packets:64841 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:7901846 (7.5 MiB)  TX bytes:7901846 (7.5 MiB)


I'd appreciate any suggestions as to how I can diagnose the problem.

Thanks,

James
Author:  aaron [ Fri Nov 09, 2007 12:41 am ]
Post subject: 
I just have to ask... have you rebooted your linode since you purchased the additional IP?

It won't work until you do. (The IP can't be routed to your UML instance on the fly while it's running)
Author:  lostcarpark [ Fri Nov 09, 2007 4:13 am ]
Post subject: 
Thanks, that's done the trick!

It might be a good idea to add that to the Wiki entry.
Author:  lostcarpark [ Fri Nov 09, 2007 4:19 am ]
Post subject: 
I have edited it now. Someone more expert than me might want to check it.

Thanks again.
Author:  OverlordQ [ Wed Nov 21, 2007 7:19 am ]
Post subject: 
FWIW I couldn't get that to work on my debian box.

Quote:
RTNETLINK answers: Invalid argument


Meh.
Author:  cboshuizen [ Sun Jan 11, 2009 12:00 am ]
Post subject:  reboot magic!
I had the same problem, and again a reboot solved it. Thanks!
Author:  marmida [ Wed Sep 09, 2009 3:28 pm ]
Post subject: 
I just edited into the "Multiple IPs" article on the wiki a note about rebooting. This also worked to solve a similarly mysterious problem with my linode not being able to get its second IP working; after a reboot, everything worked fine.

I added this note under the Debian / Ubuntu section; if this applies to other distros as well, somebody please promote that warning upwards in the article.
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