[wellylug] help - strange LAN problem

[Richard Hector]

On Sat, 2002-12-07 at 13:37, David McNab wrote:
> Hi,
> 
> I got up this morning to find my workstation box hanging on login.
> 
> After doing the rescue disk routine, I found what's been happening:
> 
> My workstation box connects via 100MB/s ethernet to my
> server/firewall/gatesay box, which connects via 10MB/s ethernet to my
> jetstart router.

Is the 100M connection a hub or switch, or a crossover?

> On gateway box, eth0 goes to adsl router, eth1 goes to workstation
> On workstation, eth0 goes to gateway.
> 
> I've got IPtables set up on the gateway box to route packets between
> eth0 and eth1. Has worked perfectly until today.
> 
> But now, when I boot up the workstation box, the gateway won't route
> packets between eth0 and eth1

Every time (since this morning)? or just the once? And are the packets
getting to the gateway?

> But when I do ifdown/ifup eth0 on the workstation box, the gateway box
> does its iptables routing perfectly.

I've got a (10M) card that gives up and reverts to 10base2 if it can't
contact the hub - If I switch the hub off and back on again (down for a
while while I rewire my cupboard or something), I have to ifdown/ifup to
get it back. Perhaps one of your cards is reverting to 10baseT and
failing to renegotiate at 100baseT?

> I can't think of anything I did yesterday or last night which would be
> causing this.

That's always the tricky bit ...

Richard



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