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On Wed, 2003-02-12 at 13:52, 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.
>
Ok so the physical stuff is working fine which rules out a hardware
issue.
I'm assuming the pings work from tunl0:0 when you use smaller packets
right?
I'm not up to speed on the IPVS:TUN model.
How are you tagging packets for use with the IPVS:TUN?
It seems that the orginal packet is being handled by IPVS but subsequent
packet fragments are not. I'm not a layer 3 expert but I'm pretty sure
packet fragments don't have all the same header info as the orginal
'parent' packet.
> I'm not sure how to look for CRC or Duplexing errors.
>
I would say you don't need to bother with the error checking if you test
the physical IP/ethernets and the pings work.
> Where now?
> -Jacob
>
>
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