High ping latency using two ethernet under FreeBSD 4.11 ...

[Nikolay Kryukov]

It's the case of incorrect configuration. Equal mac addresses must not exist in
different ports on the same vlan on catalyst switches. They may cause
problems like:
http://www.ciscotaccc.com/lanswitching/showcase?case=K19174025
and, consequently, high latency.

MGF> Testing my network, I just noticed the following:

MGF> --- 200.46.204.1 ping statistics ---
MGF> 4 packets transmitted, 4 packets received, 0% packet loss
MGF> round-trip min/avg/max/stddev = 399.664/407.119/420.315/8.267 ms

MGF> --- 200.46.208.1 ping statistics ---
MGF> 3 packets transmitted, 3 packets received, 0% packet loss
MGF> round-trip min/avg/max/stddev = 373.045/409.266/453.402/33.280 ms

MGF> 400ms to my default router seems a wee bit high ...

MGF> I'm suspecting that it has to do with:

MGF> Mar 15 01:13:28 neptune last message repeated 10 times
MGF> Mar 15 01:13:28 neptune /kernel: arp: 200.46.204.1 is on
MGF> em0 but got reply from 00:0b:bf:42:a8:06 on em1
MGF> Mar 15 01:13:28 neptune /kernel: arp: 200.46.208.1 is on
MGF> em1 but got reply from 00:0b:bf:42:a8:06 on em0

MGF> In order to provide network redundancy, and simplify our scripting, with
MGF> have one network bound to one ethernet port, and the other network bound
MGF> to the second one on the same machine ...

MGF> I'm plugging everything into a Cisco 2924 ... is there some way, either on
MGF> the FreeBSD side, or Cisco, of 'cleaning this up'?

MGF> ----
MGF> Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
MGF> Email: scrappy at hub.org           Yahoo!: yscrappy           ICQ: 7615664
MGF> _______________________________________________
MGF> freebsd-net at freebsd.org mailing list
MGF> http://lists.freebsd.org/mailman/listinfo/freebsd-net
MGF> To unsubscribe, send any mail to
MGF> "freebsd-net-unsubscribe at freebsd.org"