Great Circle Associates Firewalls
(April 1995)
 

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Subject: Re: 2 IP addresses on 1 Ethernet card? (SG IRIX 5.3)
From: Alan Hannan <alan @ mid . net>
Date: Mon, 3 Apr 1995 16:29:56 -0500 (CDT)
To: alan @ mid . net (Alan Hannan)
Cc: dar @ cadcentre . co . uk, firewalls @ GreatCircle . COM, wzhu @ yoda . unl . edu
In-reply-to: <199504031827 . NAA14172 @ jayhawk . mid . net> from "Alan Hannan" at Apr 3, 95 01:27:52 pm

>   The :1 sets up an "alias" for the interface.  I am not certain how this
> applies to IRIX.

David Zhu from Paranet writes:

:: If I am not mistaken, on IRIX 5.3 it is done by:
::  
:: ifconfig le0 10.0.0.50
:: ifconfig le0 10.0.0.60 alias
 

>   It may be possible to setup some sort of routing to (secondary) loopbacks
> in order to emulate a second ip address.  Perhaps someone that's done this
>will tell.... I know how to do it on ciscos, but cisco's IOS is a bit different
> from Unix Router Daemons.

  He further writes:

::Or you can setup your serial interface with PPP, but not really connected with
:: your network, so the routing daemon will listen to the two IP address on two
:: interfaces.
::  
:: restart your in.routed after you make the change.

  He sure is smart....  

  Now, I have to ask myself, what are some uses of multiples ip numbers on
one address?   I see the usefulness for servers, like FTP, Web, etc...; but how
about for Security and Breach detection?
-- 
			       
Alan Hannan		      	    (402) 472-0241         MIDnet Inc.
------------------------------\ fax (402) 472-0240   A Global Internet Company
" All perception of truth is   \_________________________
  the detection of an analogy " -- Henry David Thoreau   \____________________  


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