North American Network Operators Group

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Re: a record?

  • From: Jeroen Massar
  • Date: Mon Nov 14 17:50:32 2005
  • Openpgp: id=333E7C23;url=

Randy Bush wrote:
> for one host, 185,932 ssh dictionary password attacks in one gmt day
> (and, of course, password login is not enabled).

Partial "solution": rate limit ports to max X (5) new connects per X (60
secs) time.

Et tada, almost not to be seen any more.

Misc Linux-based example:

Also possible with your favorite BSD and other OS's...
Limiting port 25 also helps with those annoying bots around the net.

Other solution: disable IPv4 SSH and enable the IPv6 one, no scanning on
that plane ;)


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