[CentOS] SYD flood dropped on Sendmail (centos 4.x)
webmaster at ew3d.com
Thu Nov 20 20:38:26 UTC 2008
John Hinton wrote:
> Chris Heiner wrote:
>> My guys,
>> My firewall seems to block an attack my Centos / Sendmail boxes on
>> port 110. These servers require a reboot after each attack. My
>> firewall says it’s blocked? Do I need to patch something on sendmail?
>> Or is my firewall not doing its job (Sonicwall)? This is not the
>> first time this has happened.
>> 11/20/2008 02:53:04.864 - SYN flood attack dropped - 220.127.116.11,
>> 48102 - 10.80.80.210, 110
>> 11/20/2008 03:08:04.864 - SYN flood attack dropped - 18.104.22.168,
>> 64955, greatcooks.biz - 10.80.80.220, 110
>> 11/20/2008 03:23:08.864 - SYN flood attack dropped - 22.214.171.124,
>> 43068, greatcooks.biz - 10.80.80.210, 110
>> Any input would be much appreciated.
> If these are to bogus email addresses, you might try letting sendmail
> itself throttle the attacks. Look into sendmail's BAD_RCPT_THROTTLE.
> This has done wonders for my systems.
> John Hinton
Duh... obviously I can't read. Sorry.
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