[lir-wg] AS Number Policy

Hi,

On Thu, Jul 11, 2002 at 05:39:41PM +0200, Kurt Erik Lindqvist wrote:
> > We all know that it's a crappy argument, but lots of people try using it.
> > Especially those who have large legacy implementations that either don't
> > have or don't support filters on customer lines.
> 
> I agree with you. Still, the common argument is that it's to complex to 
> maintain and to expensive to install. 

With more recent vendor software versions, it's nearly always possible
to automatically filter single-homed customers ("ip verify unicast reverse"
in Cisco speak).  It's *easy*, and maintenance effort is zero.

For multi-homed customers, you need plain old access-lists, which isn'
that easy, but hopefully *they* will do anti-spoofing filters then (assuming
a higher clue level for multi-homing customers).

> But again, I am sure the cost of 
> dealing with the effects is close to the same amount. But few people 
> realise this.

Tell 'em about it, repeat it again and again...

Gert Doering
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