Re: 2nd class c on ethernet port.

Matthew S. Crocker (matthew@crocker.com)
Tue, 29 Oct 1996 16:02:33 -0500 (EST)

> A secondary ethernet address is a heck of a lot cheaper than a second
> ethernet card in my Cisco, so it's definitely useful, especially since
> Portmasters fill up Class Cs so quickly!

'course the 'real way to do it' is to have the ethernet of your PM on
your local lan (Class C) and route a 32 IP subnet to the PM for its
serial ports. This is what we do, works great.

There is *NO* valid reason for having two IP addresses on the same
interface. It can all be done with proper routing.

I'm in the process of installing a new 4500-M with 6 ethernet ports. I'm
going to put all routers on e0/1 and give them dummy IP addresses
(10.x.x.x). The the 'other side' of the router will get the real IP address.

My FR network is already configured with dummy IP addresses on S1, works
great. You have a whole Class A to work with when you do it this way.

PS: Routers don't need to be routable.....

-Matt

-Matthew S Crocker "The mask, given time, comes
Crocker Communications to be the face itself." -anonymous
Internet Division Phone (413) 585-5164
PO BOX 710 Fax (413) 587-3352
Greenfield, MA 01302-0710 Email matthew@crocker.com
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