North American Network Operators Group
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Re: BLS FastAccess internal tech needed
- From: Steven M. Bellovin
- Date: Thu Jan 12 23:11:08 2006
In message <20060112.195851.1587.15308@webmail05.lax.untd.com>, "Fergie" writes
:
>
>RFC2827/BCP38?
>
The problem is that an ISP can do all the source filtering it wants,
but if it only blocks SYNs to port 25 all it takes is one unfiltered
dial-up to spoof that ISP's addresses.
--Steven M. Bellovin, http://www.cs.columbia.edu/~smb
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