Subject: Re: [vserver] transient network drops
From: Herbert Poetzl <herbert@13thfloor.at>
Date: Sat, 1 Sep 2007 02:31:47 +0200

On Thu, Aug 30, 2007 at 09:33:52PM +0200, Eugen Leitl wrote:
> On Thu, Aug 30, 2007 at 12:18:54PM -0700, Roderick A. Anderson wrote:
> 
> > Hum! Do you mean ( I haven't caught up all the way on this thread ) that 
> > the two switches are inter-connected?
> > 
> > 	SWITCH0 <-> SWITCH1,
> > 	ETH0 <-> SWITCH0, and
> > 	ETH1 <-> SWITCH1.
> 
> It looks like this:
> 
> 	gateway
> 	   |
> 	switch1 (a Netgear GS724T)
> 	   |
> 	firewall (a pair of pfSense 1.2rc1, transparent bridges)
> 	   |
> 	switch2 (a HP ProCurve 2650)
> 	   |  |
> 	host  |
> 	   |  |
> 	switch3 (a Netgear GS724T)
> 
> The host has eth0 with public network space, and eth1 with
> private (10.0.0.0/24) address space, shared with other hosts.
> In theory, there should be no issue with switches 2 and 3 having
> a direct link (it is usually disabled, but I goofed up, and
> forgot this time).
> 
> I've been able to make the problems go away by disabling the port
> with the patch cable between switch2 and switch3.

well, most likely, spanning tree is the magic word here :)

(http://en.wikipedia.org/wiki/Spanning_tree_protocol)

best,
Herbert

> There's no real reason to use 3 switches as 2 with VLANs would do,
> but there was not yet enough time to work on-site to make everything
> work. (Working remotely is not an option, since it's too easy to
> screw up, and guiding remote hands through an ssh session you don't
> see is no picnic).
>  
> > I am working at, as time permits, getting three Ethernet devices working 
> > on one host and the guests needing to access two of the networks.  WAN1, 
> > WAN2, LAN with each guest needing either WAN1 or WAN2 and LAN access. 
> > In reality WAN1 and WAN2 both use the same feed (router etc. ) into the 
> > internet but they use very different address ranges.
> > 
> > Is this similar to you are trying to do?
> 
> Doesn't quite sound that way.
> 
> -- 
> Eugen* Leitl <a href="leitlhttp://leitl.org">leitl</a> http://leitl.org
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