North American Network Operators Group
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Re: Vonage complains about VoIP-blocking

  • From: Rob Thomas
  • Date: Tue Feb 15 16:29:13 2005 
Hi, Dan.

] Why block TFTP at your borders? To keep people from loading new versions of
] IOS on your routers? ;)

Funny you should mention that.  :)  We have seen miscreants do exactly
that.  They will upgrade or downgrade routers to support a feature set
of their choosing.

A lot of malware uses TFTP to update itself as well.

Please note that I am NOT advocating the blocking of TFTP.

Thanks,
Rob.
-- 
Rob Thomas
http://www.cymru.com
Shaving with Occam's razor since 1999.