Sujit Acharyya-choudhury <[email protected]> (Fr 03 Jul 2015 11:58:31 CEST): > We have seen recently two DoS attacks on our mail gateways, but the machines > and Exim coped well. Our network administrator suggested to block ping, but > from my previous experience elsewhere it cause some problem - I cannot > recall exactly what. Any thoughts on this. I know it is Out of Topic.
Blocking Ping (excactly ICMP echo requests) doesn't prevent anything,
except pinging you. If pinging you is a problem, you can ratelimit it
(Linux has some kernel parameter, IPTables is capable of limiting it
too)
Blocking other ICMP traffic that is not related to your
outgoing connections might help a bit.
And yes, as long as there are not more details it's hard to help and
it's hard to understand how it's related to Exim.
Best regards from Dresden/Germany
Viele Grüße aus Dresden
Heiko Schlittermann
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