Hi Maurits,<br><br>Thanks a lot for your reply. But your solution did not work for me. Still i am getting the same issue.<br><br>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.<br>
<br>Also i did not check the el6 kernel in my setup.<br><br>Thanks,<br>Prem.<br><br><div class="gmail_quote">On Wed, Jul 18, 2012 at 2:16 PM, Maurits van de Lande <span dir="ltr"><<a href="mailto:M.vandeLande@vdl-fittings.com" target="_blank">M.vandeLande@vdl-fittings.com</a>></span> wrote:<br>
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<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)">Hello,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)" lang="EN-US">Question: Did your setup work on a regular el6 kernel?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)" lang="EN-US">If not:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)" lang="EN-US">I have setup a centos router a while ago and faced a similar problem.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)" lang="EN-US">I had to add the following to /etc/sysctl.conf<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)" lang="EN-US">I think that the icmp packets are not forwarded between the two interfaces
<u></u><u></u></span></p>
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<span style="font-size:10pt;font-family:"Courier New"" lang="EN-US"># allow icmp forwards (normal router mode)<u></u><u></u></span></p>
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<span style="font-size:10pt;font-family:"Courier New"" lang="EN-US">net.ipv4.icmp_errors_use_inbound_ifaddr = 1<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)" lang="EN-US">I hope this helps<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)" lang="EN-US">Maurits van de Lande<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)" lang="EN-US"><u></u> <u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:10pt;font-family:"Tahoma","sans-serif"">Van:</span></b><span style="font-size:10pt;font-family:"Tahoma","sans-serif""> <a href="mailto:elrepo-bounces@lists.elrepo.org" target="_blank">elrepo-bounces@lists.elrepo.org</a> [mailto:<a href="mailto:elrepo-bounces@lists.elrepo.org" target="_blank">elrepo-bounces@lists.elrepo.org</a>]
<b>Namens </b>cute candy<br>
<b>Verzonden:</b> woensdag 18 juli 2012 9:04<br>
<b>Aan:</b> <a href="mailto:elrepo@lists.elrepo.org" target="_blank">elrepo@lists.elrepo.org</a><br>
<b>Onderwerp:</b> [elrepo] Route problem with dual interface in elrepo kernel<u></u><u></u></span></p>
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<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Hi All,<br>
<br>
I am using kernel version "kernel-ml-PAE-2.6.39-4.1.el5.<u></u><u></u></p>
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<p class="MsoNormal">elrepo.i686.rpm". My machine has two network interfaces eth0 and eth1. I configured IP on both the interfaces. Below is the snippet.<br>
<br>
eth0 Link encap:Ethernet HWaddr 00:15:17:61:D2:16<br>
inet addr:10.77.247.172 Bcast:10.77.247.175 Mask:255.255.255.240<br>
inet6 addr: 1701::215:17ff:fe61:d216/64 Scope:Global<br>
inet6 addr: fe80::215:17ff:fe61:d216/64 Scope:Link<br>
inet6 addr: 1701::59b0:2825:8287:29b8/64 Scope:Global<br>
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1<br>
RX packets:77 errors:0 dropped:0 overruns:0 frame:0<br>
TX packets:74 errors:0 dropped:0 overruns:0 carrier:0<br>
collisions:0 txqueuelen:1000<br>
RX bytes:11432 (11.1 KiB) TX bytes:7725 (7.5 KiB)<br>
Interrupt:17 Memory:e8180000-e81a0000<br>
<br>
eth1 Link encap:Ethernet HWaddr 00:15:17:61:D2:17<br>
inet addr:10.77.243.154 Bcast:10.77.243.255 Mask:255.255.255.128<br>
inet6 addr: 5abe::215:17ff:fe61:d217/64 Scope:Global<br>
inet6 addr: 1901::215:17ff:fe61:d217/64 Scope:Global<br>
inet6 addr: fe80::215:17ff:fe61:d217/64 Scope:Link<br>
inet6 addr: 5abe::9d72:9c93:78c0:e6f6/64 Scope:Global<br>
inet6 addr: 1901::9d72:9c93:78c0:e6f6/64 Scope:Global<br>
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1<br>
RX packets:2423 errors:0 dropped:0 overruns:0 frame:0<br>
TX packets:137 errors:0 dropped:0 overruns:0 carrier:0<br>
collisions:0 txqueuelen:1000<br>
RX bytes:214114 (209.0 KiB) TX bytes:9211 (8.9 KiB)<br>
<br>
lo Link encap:Local Loopback<br>
inet addr:127.0.0.1 Mask:255.0.0.0<br>
inet6 addr: ::1/128 Scope:Host<br>
UP LOOPBACK RUNNING MTU:16436 Metric:1<br>
RX packets:15851 errors:0 dropped:0 overruns:0 frame:0<br>
TX packets:15851 errors:0 dropped:0 overruns:0 carrier:0<br>
collisions:0 txqueuelen:0<br>
RX bytes:4133739 (3.9 MiB) TX bytes:4133739 (3.9 MiB)<br>
<br>
I configured default gateway in eth0. Below is the snippet.<br>
<br>
[root@ACS172 ~]# route -A inet -n<br>
Kernel IP routing table<br>
Destination Gateway Genmask Flags Metric Ref Use Iface<br>
10.77.247.160 0.0.0.0 255.255.255.240 U 0 0 0 eth0<br>
10.77.243.128 0.0.0.0 255.255.255.128 U 0 0 0 eth1<br>
0.0.0.0 10.77.247.161 0.0.0.0 UG 0 0 0 eth0<br>
<br>
Issue:<br>
<br>
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.<br>
<br>
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.<br>
<br>
Thanks,<br>
Prem.<u></u><u></u></p>
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