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From: nocfed (nocfedgmail.com)
Date: Tue Oct 23 2007 - 19:11:40 CDT
On 10/22/07, Anders B Jansson <hdwkallisti.se> wrote:
> A.L.M.Buxeylboro.ac.uk wrote:
> > Hi,
> >> Oct 22 20:36:13 nms sshd: Failed password for invalid user gopher
> >> from 220.127.116.11 port 55120 ssh2
> > user/password authentication for SSH? one way of cleaning up your
> > logs and killing this type of attack is to reconfigure your OpenSSH
> > to only allow key based logins. stopped my 10M+ logfiles straight away
> An even better way is to punt the attackers to a 'silent drop' table in your firewall.
> Cuts your logs to nothing and keeps the kiddies wasting their time.
> The latest attack surge is either directed or a bit more clever, haven't seen anything on my random user DSL traps.
> // hdw
I still say to throw them into a TARPIT table and tag their
connections to throw them into a nice TCP window size of 0. Currently
I lower unknown connections window size to bring them to a crawl while
known ranges immediately go through. It's not about blocking all
unknown, but about making the process take up more of their resources.
A silent drop will take up very little of the worm's time when
compared to a tarpit that can eat up minutes(hours if they do not set
timeouts) per connection.
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