[elrepo] Route problem with dual interface in elrepo kernel

[cute candy]

Sending again with correction

On Wed, Jul 18, 2012 at 5:43 PM, cute candy
<sweetheartshere at googlemail.com>wrote:

> 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 not
> 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.****
>>
>> _______________________________________________
>> elrepo mailing list
>> elrepo at lists.elrepo.org
>> http://lists.elrepo.org/mailman/listinfo/elrepo
>>
>>
>
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