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

[Marc G. Fournier]

On Tue, 15 Mar 2005, Nikolay Kryukov wrote:

> 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:

'k, now I'm confused ... I hadn't noticed that, but how is it that they 
are 'equal'?  I take it that 00:0b:bf:42:a8:06 is the MAC on the switch 
itself, since that machines MAC addresses are:

         ether 00:07:e9:05:1b:2e
         ether 00:07:e9:05:1b:2f

does the cisco switch 'share' a mac across all ports?

> 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
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----
Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
Email: scrappy at hub.org           Yahoo!: yscrappy              ICQ: 7615664