Date: Tue, 15 Mar 2005 13:17:02 -0400 (AST) From: "Marc G. Fournier" <scrappy@hub.org> To: Nikolay Kryukov <kki@rt.mipt.ru> Cc: freebsd-net@freebsd.org Subject: Re: High ping latency using two ethernet under FreeBSD 4.11 ... Message-ID: <20050315131401.U92893@ganymede.hub.org> In-Reply-To: <155155568625.20050315193204@rt.mipt.ru> References: <20050315011200.G92893@ganymede.hub.org> <155155568625.20050315193204@rt.mipt.ru>
next in thread | previous in thread | raw e-mail | index | archive | help
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@hub.org Yahoo!: yscrappy ICQ: 7615664
> MGF> _______________________________________________
> MGF> freebsd-net@freebsd.org mailing list
> MGF> http://lists.freebsd.org/mailman/listinfo/freebsd-net
> MGF> To unsubscribe, send any mail to
> MGF> "freebsd-net-unsubscribe@freebsd.org"
>
> _______________________________________________
> freebsd-net@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-net
> To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
>
----
Marc G. Fournier Hub.Org Networking Services (http://www.hub.org)
Email: scrappy@hub.org Yahoo!: yscrappy ICQ: 7615664
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20050315131401.U92893>