North American Network Operators Group|
Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical
Re: On-going Internet Emergency and Domain Names
On Sat, 31 Mar 2007, Gadi Evron wrote:
In this case, we speak of a problem with DNS, not sendmail, and not bind.
The argument can be made that you're trying to solve a windows-problem by implementing blocking in DNS.
Next step would be to ask all access providers to block outgoing UDP/53 so people can't use open resolvers or machines set up to act as resolvers for certain DNS information that the botnets need, as per the same analysis that blocking TCP/25 stops spam.
So what you're trying to do is a pure stop-gap measure that won't scale in the long run. Fix the real problem instead of trying to bandaid the symptoms.
-- Mikael Abrahamsson email: swmike@xxxxxxxxx