On Tue, Jan 03, 2006 at 12:37:29PM +0100, Pailloncy Jean-Gerard wrote:
> And also wrote:
> >The two cables came from two routers of my provider.
> >The two ips (a.b.c.1 and a.b.c.2) are in the same vlan on the two
> >different routers.
> >Broadcast should work.
> >So on outside, a CARP should be the simple thing I have to do.
> >
> >Thank you for the information.
>
> I do not understand how the packets coming from the gateway a.b.c.1-2
> are able to reach the routers a.b.c.3-4 on the CARP address a.b.c.5.
The routing table on a.b.c.[12] will simply tell them to push everything
for a.b.c.0/24 out of some interface. It's then up to whatever is
attached to that interface to provide routing.
(Discarding complicated stuff, routing tables basically look up an IP
address and tell the kernel what interface to use to send packets for
that IP address.)
Per se, it's very much possible to rename your routers a.b.c.253 and
a.b.c.254. Numbering them a.b.c.[34] is easiest, which is generally a
good thing, but it is quite possible.
In this case, a (virtual) CARP interface is attached.
I'm afraid I don't know much about vlans, so you're on your own there -
but it shouldn't be too difficult.
There are many good books that deal with such topics, BTW; I'm afraid I
can't give recommendations, aside from the fact that Tanenbaum's
'Computer Networks' is very good, but a little too thorough if you just
want to make stuff work.
Joachim
