[elrepo] Route problem with dual interface in elrepo kernel

[cute candy]

Hi Maurits,

Thanks a lot for your reply. But your solution did not work for me. Still i
am getting the same issue.

I suspect this is not specific ICMP. Any request coming to eth1 IP, is
going out through default gateway configured in eth0. But it is expected to
pass through.

Also i did not check the el6 kernel in my setup.

Thanks,
Prem.

On Wed, Jul 18, 2012 at 2:16 PM, Maurits van de Lande <
M.vandeLande at vdl-fittings.com> wrote:

>  Hello,****
>
> ** **
>
> Question: Did your setup work on a regular el6 kernel?****
>
> ** **
>
> If not:****
>
> I have setup a centos router a while ago and faced a similar problem.****
>
> ** **
>
> I had to add the following to /etc/sysctl.conf****
>
> ** **
>
> I think that the icmp packets are not forwarded between the two interfaces
> ****
>
> # allow icmp forwards (normal router mode)****
>
> net.ipv4.icmp_errors_use_inbound_ifaddr = 1****
>
> ** **
>
> I hope this helps****
>
> ** **
>
> Maurits van de Lande****
>
> ** **
>
> *Van:* elrepo-bounces at lists.elrepo.org [mailto:
> elrepo-bounces at lists.elrepo.org] *Namens *cute candy
> *Verzonden:* woensdag 18 juli 2012 9:04
> *Aan:* elrepo at lists.elrepo.org
> *Onderwerp:* [elrepo] Route problem with dual interface in elrepo kernel**
> **
>
> ** **
>
> Hi All,
>
> I am using kernel version "kernel-ml-PAE-2.6.39-4.1.el5.****
>
> elrepo.i686.rpm". My machine has two network interfaces eth0 and eth1. I
> configured IP on both the interfaces. Below is the snippet.
>
> eth0 Link encap:Ethernet HWaddr 00:15:17:61:D2:16
>           inet addr:10.77.247.172 Bcast:10.77.247.175 Mask:255.255.255.240
>           inet6 addr: 1701::215:17ff:fe61:d216/64 Scope:Global
>           inet6 addr: fe80::215:17ff:fe61:d216/64 Scope:Link
>           inet6 addr: 1701::59b0:2825:8287:29b8/64 Scope:Global
>           UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>           RX packets:77 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:74 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:11432 (11.1 KiB) TX bytes:7725 (7.5 KiB)
>           Interrupt:17 Memory:e8180000-e81a0000
>
> eth1 Link encap:Ethernet HWaddr 00:15:17:61:D2:17
>           inet addr:10.77.243.154 Bcast:10.77.243.255 Mask:255.255.255.128
>           inet6 addr: 5abe::215:17ff:fe61:d217/64 Scope:Global
>           inet6 addr: 1901::215:17ff:fe61:d217/64 Scope:Global
>           inet6 addr: fe80::215:17ff:fe61:d217/64 Scope:Link
>           inet6 addr: 5abe::9d72:9c93:78c0:e6f6/64 Scope:Global
>           inet6 addr: 1901::9d72:9c93:78c0:e6f6/64 Scope:Global
>           UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>           RX packets:2423 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:137 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:214114 (209.0 KiB) TX bytes:9211 (8.9 KiB)
>
> 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:15851 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:15851 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:4133739 (3.9 MiB) TX bytes:4133739 (3.9 MiB)
>
> I configured default gateway in eth0. Below is the snippet.
>
> [root at ACS172 ~]# route -A inet -n
> Kernel IP routing table
> Destination Gateway Genmask Flags Metric Ref Use Iface
> 10.77.247.160 0.0.0.0 255.255.255.240 U 0 0 0 eth0
> 10.77.243.128 0.0.0.0 255.255.255.128 U 0 0 0 eth1
> 0.0.0.0 10.77.247.161 0.0.0.0 UG 0 0 0 eth0
>
> Issue:
>
> The issue is IP configured in eth1(10.77.243.154) is not pinging from
> other subnets(other than 10.77.243 network in my case). I captured TCP dump
> and could see ICMP request reaches the eth1 but ICMP response is not sent
> back.
>
> Please let me know anyone faced this issue and how to resolve it. I am
> blocked because of this issue, any help would be really helpful.
>
> Thanks,
> Prem.****
>
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