Re: Multiple Class Cs on same physical network (fwd)

Jon Lewis (jlewis@inorganic5.fdt.net)
Thu, 19 Dec 1996 00:11:12 -0500 (EST)

On Wed, 18 Dec 1996, MegaZone wrote:

> Once upon a time Brian K. Jackson shaped the electrons to say...
> >Even the most simple minded pc routing can have more then one sub/net route
>
> Really? I've seen a number of them and none of them do multihoming.

I don't think Win95 or win31 with Trumpet will do this. WinNT will...but
it's a bit odd to setup. OS/2 can do it, but only if there is a gateway
to talk to on each one (i.e. needs secondary addresses on your Crisco
eth0). Linux can do it without any help...routes are routes, and it will
send IP out whatever interface you ask it to.

> We don't support multihoming. It is one network/subnet per interface.

But why? It's just another route. This brings up a question I have about
static addresses. On my Linux term servers, I've been too
busy/overworked/lazy (pick one) to configure gated...so I have this nasty
hack of routing an extra /24 out eth0 on our Cisco (internet gateway).
This /24 is used for static addresses on our multiple linux term servers.
The linux term servers proxyarp for these addresses, the cisco sees this,
and directs traffic accordingly. To make this work, I had to set the
cisco arp cache time from the default 4h to 1m.

Am I correct in assuming addresses from this /24 will not work properly if
a static address person connects to my pm2ei? Do I need to assign another
/24 for this and subnet it into little tiny bits or just use addresses
from our primary ethernet /24 for isdn static addresses? Neither of these
is an appealing thought.

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