Great Circle Associates Firewalls
(September 1996)
 

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Subject: Ascend numbered interfaces
From: Neale Banks <neale @ planet . net . au>
Date: Mon, 2 Sep 1996 11:40:26 +1000 (EST)
To: firewalls list <firewalls @ GreatCircle . COM>

Recently, Ascend introduced support for "numbered" interfaces.  From the 
release notes:

--snip------------------------------------
The Pipeline will accept IP packets whose destination is a numbered 
interface listed in a Connection profile, considering them to be destined 
for the Pipeline itself. (The packet may actually arrive over any 
interface, and the numbered interface corresponding to the packet's 
destination address need not be in the active state.)
--snip------------------------------------

Interesting that it will accept packets over *any* interface, destined 
for that _or_any_other_ interface.

Any thoughts regarding if this is a security risk?

Ob firewalls: using static filtering or Ascend's firewalling (ie 
Morningstar dynamic filtering) this should be controllable.  Any 
remaining security risks?

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 Neale Banks                                   Ph: +61 3 9205 0333
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 au
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