Great Circle Associates Firewalls
(February 1997)
 

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Subject: Re: Firewalls-Digest V6 #70
From: "Shadoe - Master of all He surveys" <shadoe @ os2warp . com>
Date: Tue, 11 Feb 97 07:57:27 -0600
To: "Firewalls @ GreatCircle . COM" <Firewalls @ GreatCircle . COM>
Reply-to: "Shadoe - Master of all He surveys" <shadoe @ os2warp . com>

On Fri, 21 Feb 1997 09:45:40 -0800 (PST), Firewalls-Digest wrote:

Hmm, I don't know about this.  On my LAN at home, I have one system
with 2 NICs and one loopback adapter defined and they all reside on the
same subnet.  Here are my ifconfigs :

lan0: flags=bc63<UP,BROADCAST,NOTRAILERS,RUNNING,BRIDGE,SNAP>
         inet 205.230.251.161 netmask xffffffe0 broadcast
205.230.251.191

lan1: flags=bc63<UP,BROADCAST,NOTRAILERS,RUNNING,BRIDGE,SNAP>
         inet 205.230.251.162 netmask xffffffe0 broadcast
205.230.251.191

lo: flags=809<UP,LOOPBACK>
         inet 205.230.251.164 netmask xffffffe0


And my routing table entries :

  destination         router          netmask   refcnt   use  flags 
snmp intrf
                                                                    
metric
        default   205.230.248.1         0.0.0.0    0    20908  UG      
0  ppp0
  205.230.248.1 205.230.251.161 255.255.255.255    1     5735  UH      
0  ppp0
205.230.251.160 205.230.251.161 255.255.255.224    0        0  U       
0  lan0
205.230.251.162 205.230.251.162 255.255.255.255    0        0  UH      
0  lan1
205.230.251.164 205.230.251.164 255.255.255.255    0       28  UH      
0  lo


With this setup I am able to have 3 IP addresses assigned to my
machine.  Note, also that lan0 has the same IP as ppp0, and when I'm
dialed up, I can 'see' (via ping, telnet, etc...) all three of the IP
address I have configured for my machine, as well as beeing able to see
the same IP on my LAN.

Forgive me if that didn't answer your question, but I was proud of
myself when I FINALLY got that crap to work correctly! ;)

>Date: Thu, 20 Feb 1997 11:03:38 -0500
>From: "Skeet Spillane" <cspillane @
 harpcomm .
 com>
>Subject: Re:How to configure two network interface into a sam subnet
>
>What is the end result you are trying to acheive by having two cards with
>the same subnet on the same host?  This will not work, they must be on two
>separate subnets, and allow the os to route between them.  Let us know what
>you are trying to acheive and maybe we can hel there.

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