carp and duplicated echo replies

Steve Polyack korvus at
Wed Mar 18 13:36:56 PDT 2009

gahn wrote:
> My two servers have carp configured and work fine. but the pings directed to the virtual interface (carp interface for both server) result duplicated replies:
> 64 bytes from icmp_seq=0 ttl=64 time=0.049 ms
> 64 bytes from icmp_seq=1 ttl=64 time=0.016 ms (DUP!)
> 64 bytes from icmp_seq=2 ttl=64 time=0.020 ms
> 64 bytes from icmp_seq=3 ttl=64 time=0.035 ms (DUP!)
> 64 bytes from icmp_seq=4 ttl=64 time=0.016 ms
> 64 bytes from icmp_seq=5 ttl=64 time=0.015 ms (DUP!)
> 64 bytes from icmp_seq=6 ttl=64 time=0.014 ms
> 64 bytes from icmp_seq=7 ttl=64 time=0.014 ms (DUP!)
> ...
> Is that normal? VRRP virtual interface don't seem to behave that way.
No, that's not normal.  Are you sure that you specified different 
advskews for the carp interfaces on both servers?  Do the interfaces 
both display that they are in MASTER status, or is one in BACKUP mode?

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