SYN floods continue

Wed Sep 11 16:00:39 UTC 1996

     At the expense of sounding very redudant, filtering at the edge will 
     allow Mobility to work within your network since you do not need to 
     filter on the outbound router based on a source address which belongs 
     to your address space (and clearly in the case of mobility, the 
     station has an address which belongs to his home network).

     Pat R. Calhoun                                e-mail: pcalhoun at usr.com 
     Project Engineer - Lan Access R&D                phone: (847) 933-5181 
     US Robotics Access Corp.

______________________________ Reply Separator _________________________________
Subject: Re: SYN floods continue
Author:  Sean Donelan <SEAN at SDG.DRA.COM> at Internet
Date:    9/11/96 8:18 AM

>Until this problem becomes gigantic enough that it affects large networks 
>such as MCI, Sprint, UUNet, etc. I don't predict much will be done.  

History is such a strange beast.

I believe one of Sprint's engineers called for this type of filtering 
several years ago.  AT&T's WorldNet advertises something called "source 
address assurance" on their network.  ANS did some filtering at one point, 
but I was never very clear what exactly they were checking.

I don't think you can blame the lack of action solely on the large 
networks.  Raise your hands, how many little providers didn't have 
outbound filters/access-lists on their networks before you were 
attacked?  How many didn't have inbound filters/access-lists on 
their customer networks?

The Mobile IP folks complained this would prevent their work last time 
this came up.  Since then firewalls have led to the increased use of 
tunnelling for Mobile IP, so this may not be as much of a concern now.

This might be a nice addition to RtConfig. 
-- 
Sean Donelan, Data Research Associates, Inc, St. Louis, MO
  Affiliation given for identification not representation
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Date: Wed, 11 Sep 1996 8:18:36 -0500 (CDT)
From: Sean Donelan <SEAN at SDG.DRA.COM>
To: nanog at merit.edu
Message-Id: <960911081836.247c at SDG.DRA.COM>
Subject: Re: SYN floods continue
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