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Jacob Coby wrote:
>
> > This sounds layer 2ish. Do you have MTU problems between interfaces?
> > Try pinging between all the machines with large pings (>935) and see
> > what happens. Any CRC errors on the interfaces or switch ports? Any
> > Duplexing errors?
>
> I think you've found the root of the problem:
>
> [root@beta root]# ping -I 206.27.7.52 -s 1024 ws4
> PING ws4.listingbook.com (206.27.7.8) from 206.27.7.52 : 1024(1052) bytes of
> data.
>
> --- ws4.listingbook.com ping statistics ---
> 3 packets transmitted, 0 received, 100% loss, time 2017ms
>
> This happens on both real servers. The director has no problems with the
> large ping:
>
> [root@delta root]# ping -I 206.27.7.52 -s 1024 ws4
> PING ws4.listingbook.com (206.27.7.8) from 206.27.7.52 : 1024(1052) bytes of
> data.
> 1032 bytes from ws4.listingbook.com (206.27.7.8): icmp_seq=1 ttl=128
> time=0.638 ms
> 1032 bytes from ws4.listingbook.com (206.27.7.8): icmp_seq=2 ttl=128
> time=0.553 ms
>
> --- ws4.listingbook.com ping statistics ---
> 2 packets transmitted, 2 received, 0% loss, time 1006ms
> rtt min/avg/max/mdev = 0.553/0.595/0.638/0.049 ms
>
> ------------------
> Pinging ws4 on the eth0 interface with large packets works great, it seems
> to be only the tunl0:0 device that is incapable of the large ping.
>
> I'm not sure how to look for CRC or Duplexing errors.
>
> Where now?
> -Jacob
>
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--
Joseph Mack PhD, Senior Systems Engineer, SAIC contractor
to the National Environmental Supercomputer Center,
ph# 919-541-0007, RTP, NC, USA. mailto:mack.joseph@xxxxxxx
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