Ping not returns but ssh/telnet works fine

[GizemIremKozan]

Hi there,

I have 2 HP-UX on same subnet and having a problem on one about ping. I'll call them as hp01 hp02.

hp01 can ping hp02 (ping says %100 transmitted)
hp01 can ssh/telnet hp02
hp02 can ssh/telnet hp01
hp02 cannot ping hp01 (ping says %100 packet loss)

There I thought of ndd commands, and set "ip_forwarding" as it could be the cause but it still didn't affect to behave normally.

I don't know if this problem exists since the installations.

Any ideas about what it could be?

Thanks

[Dave Olker · Accepted solution]

Are either system running IP Filter or any other software-based firewall programs that might be denying ICMP traffic?  Since ssh/telnet work, I assume hostname resolution is not the issue.  Likely don't need to verify with linkloop either since ssh/telnet are working. 

Have you tried collecting a network trace on both systems during the ping failure to see if the ICMP requests are making it to the remote system and if any attempt at a reply is on the wire?

Dave

[GizemIremKozan]

Ok, found some strange ipfilter enabled on the troubled hp01 coming with the installation; flushed it.

ipf -Fa
ipfstat -io
>empty

Isn't that strange that? I'm glad not to work with that tcpdump version of hpux. thanks,