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 - 75.2.205.141, 48102 - 10.80.80.210, 110
11/20/2008 03:08:04.864 - SYN flood attack dropped - 75.2.205.141, 64955, greatcooks.biz - 10.80.80.220, 110
11/20/2008 03:23:08.864 - SYN flood attack dropped - 75.2.205.141, 43068, greatcooks.biz - 10.80.80.210, 110
Any input would be much appreciated.
Thanks.
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.
John Hinton