SYN spoofing

Joe Shaw jshaw at
Wed Jul 28 14:39:33 UTC 1999

Any provider who allows the passing of address space that isn't his own
(beyond whatever transit they may provide to their peers) is shameful.  

How hard is it really to put a filter on your outbound links that says
drop all ip traffic heading out these links that isn't from my IP space?
It's just like martian filters for your inbound links, and we'd see a
significant decrease in spoofing based attacks if it was more widely
adopted.  Not to mention it'll keep peers from dumping traffic on you.

Joseph W. Shaw - jshaw at    
Freelance Computer Security Consultant and Perl Programmer
Free UNIX advocate - "I hack, therefore I am."

On Wed, 28 Jul 1999, John Fraizer wrote:

> Perhaps if you were to NAME these networks, they may be shamed into doing
> something about the problem.  Then again, they should be ashamed to begin
> with for passing RFC1918 traffic, let alone loopback space.

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