Vonage complains about VoIP-blocking
Rob Thomas
robt at cymru.com
Tue Feb 15 21:28:12 UTC 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.
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