I just gave this a try and it ended up causing all sorts of problems with my
Static Address Mappings and Inbound Tunnels.  Here are my IP block
assignments:

68.217.104.24/30 (255.255.255.252)
68.217.104.16/29 (255.255.255.248)
68.217.104.64/27 (255.255.255.224)

When I set an alias for 68.217.104.16 - 255.255.255.248, I get a warning
message saying "IP Address is Network Address".  Then my Inbound Tunnels
give me a warning messages like "Tunnel 5, starting (68.217.104.17) doesn't
match any interface or alias".  And in my Static Address Mappings I get
warning messages like "Map 1, (68.217.104.20) is not mapped to a valid IP
address or alias".

What am I doing wrong?
-Brian
 

-----Original Message-----
From: Brian (Mushkin) [mailto:[EMAIL PROTECTED] 
Sent: Tuesday, February 24, 2004 12:27 PM
To: 'david raistrick'
Cc: [EMAIL PROTECTED]
Subject: RE: [gb-users] multiple external subnets on a single interface

I'm embarassed that that never occurred to me :-)  Thanks!


-----Original Message-----
From: david raistrick [mailto:[EMAIL PROTECTED]
Sent: Tuesday, February 24, 2004 12:07 PM
To: Brian (Mushkin)
Cc: [EMAIL PROTECTED]
Subject: RE: [gb-users] multiple external subnets on a single interface

On Tue, 24 Feb 2004, Brian (Mushkin) wrote:

> I have the same setup from my ISP.  It works fine although under 'NAT
> -> Aliases', GNATBox tells me "...IP Address is on unique network".  
> No

You should add the netmask for the first entry in an otherwise undefined
network.

For example, I have 4 aliases:

10.50.1.5
10.50.1.6
10.60.1.7
10.60.1.8

My physical interface has 10.50.1.4/24 assigned, so there is no need to
assign a netmask for the two 10.50.1.0/24 addresses. (the gnatbox
automaticly adds a /32 netmask, or 255.255.255.255)

10.60.1.0/24 is not defined elsewhere, though, and the NAT>Aliases entry is
the first definition for the network.  I should define a netmask in the
entry, then, using:

10.61.1.7/24

10.60.1.8 will not need a netmask.


Done this way, the warning you mention will go away, and local-network
routing will be handled properly.

...david

--
David Raistrick
        Systems Administrator - Global Technology Associates, Inc
[EMAIL PROTECTED]
        Disclaimer:  All opinions expressed are the opinions of
        David Raistrick, not necessarily those of GTA, Inc.

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