Re: packet duplication

From: German Martinez (gmartine@nic.gip.net)
Date: Sun Dec 02 2001 - 11:27:10 EST


> When I ping to a particular router my reply packets are
> getting duplicated. It looks like:
>
> bash-2.03$ ping 137.164.12.33
> PING 137.164.12.33 (137.164.12.33): 56 data bytes
> 64 bytes from 137.164.12.33: icmp_seq=0 ttl=250 time=24.924 ms
> 64 bytes from 137.164.12.33: icmp_seq=0 ttl=250 time=25.013 ms (DUP!)
> 64 bytes from 137.164.12.33: icmp_seq=0 ttl=248 time=25.247 ms (DUP!)
> 64 bytes from 137.164.12.33: icmp_seq=0 ttl=248 time=25.698 ms (DUP!)
> 64 bytes from 137.164.12.33: icmp_seq=1 ttl=250 time=24.084 ms
> 64 bytes from 137.164.12.33: icmp_seq=1 ttl=250 time=24.594 ms (DUP!)
> 64 bytes from 137.164.12.33: icmp_seq=1 ttl=248 time=24.825 ms (DUP!)
> 64 bytes from 137.164.12.33: icmp_seq=1 ttl=248 time=25.030 ms (DUP!)
> 64 bytes from 137.164.12.33: icmp_seq=2 ttl=250 time=24.330 ms
> 64 bytes from 137.164.12.33: icmp_seq=2 ttl=250 time=24.544 ms (DUP!)
> 64 bytes from 137.164.12.33: icmp_seq=2 ttl=248 time=24.750 ms (DUP!)
> 64 bytes from 137.164.12.33: icmp_seq=2 ttl=248 time=25.173 ms (DUP!)
>
> Not shown here, but this effect happens when I pass through this
> router. Anything beyond it is replicated.
>

Do you have any router running APS on this path ? What about a linecard
with 8 ports OC-3 (the new one from Cisco) ?

Best Regards,
German Martinez
Opentransit NOC - US



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