[Techtalk] troubleshoot slow ping and packets lost

[Joana Botto]

Hi,

I'm writing with hope to have some tips on troubleshooting a network
issue I have with one of my company's client.

My client has three solaris servers in the same lan. One of them is
sending alerts time to time with packets lost. The monitoring is set
up in a
windows server that pings them them every 10 minutes. The solaris
server that is generating the alerts has two physical NICs with
bonding.
Here is it's conf:

lo0: flags=1000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4> mtu 8232 index 1
       inet 127.0.0.1 netmask ff000000
ce0: flags=9000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,NOFAILOVER> mtu
1500 index 2
       inet 10.160.30.55 netmask ffffff00 broadcast 10.160.30.255
       groupname prod
       ether 0:14:4f:0:f3:48
ce0:1: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
       inet 10.160.30.56 netmask ffffff00 broadcast 10.160.30.255
ce1: flags=9000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,NOFAILOVER> mtu
1500 index 3
       inet 10.160.30.54 netmask ffffff00 broadcast 10.160.30.255
       groupname prod
       ether 0:14:4f:0:f3:48

I don't understand why the NICs have identical mac addresses. I ping
the three NICs from localhost and there are no packets lost, it's just
when I ping from the monitoring server.

Pinging 10.160.30.55 with 32 bytes of data:
Reply from 10.160.30.55: bytes=32 time<1ms TTL=255
Reply from 10.160.30.55: bytes=32 time=27ms TTL=255
Request timed out.
Reply from 10.160.30.55: bytes=32 time<1ms TTL=255

Ping statistics for 10.160.30.55:
       Packets: Sent = 4, Received = 3, Lost = 1 (25% loss),
Approximate round trip times in milli-seconds:
   Minimum = 0ms, Maximum = 27ms, Average = 9ms

I'll probably go to the site this week. Could you please give some
more clues on what to look or what to try?

Thank you.

Regards,
Joana Botto