[CentOS] Poor perfmance of bridged interfaces

Sat Nov 14 17:20:17 UTC 2015
Sergio Belkin <sebelk at gmail.com>

2015-11-13 16:43 GMT-03:00 Gordon Messmer <gordon.messmer at gmail.com>:

> On 11/13/2015 09:15 AM, Sergio Belkin wrote:
>> But.... AFAIK, routers divide broadcast domains, and switches (and
>> therefore bridges) divide collision domains.
> Oh good, Cisco terminology.  :)

Oh yeah,

> I'll be more specific than I was earlier, then.
> It's possible to unify two collision domains into a single broadcast
> domain with a router, but it's also possible to use a bridge to link
> collision domains to create a larger broadcast domain.  Don't get hung up
> on that.
> The comparison of a Linux bridge to a switch is apt.  You could,
> conceptually, connect two PCs to each other using a Linux bridge. You
> wouldn't, however, connect two ports on one switch (here, the Linux bridge)
> to two ports on another switch.  Doing that creates a loop in your network.
> Linux Ethernet bridges have several uses, so it's not clear what you're
> really trying to do.  That is, you've said that you're trying to create a
> virtualized Linux bridge, but a bridge is a tool, not a goal in itself.
> What do you expect the bridge to do when you've set it up?
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I'd want to connect a VM to another VM (or eventually to the host) via the
"Linux bridge" so that I can demonstrate that capability in a classroom
with only one laptop.

Sergio Belkin
LPIC-2 Certified - http://www.lpi.org