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 :: Mailing Lists

[ILUG] Hardening Linux

[ILUG] Hardening Linux

Dave Wilson dave.wilson at heanet.ie
Thu May 30 13:42:57 IST 2002


>>Allow incoming ICMP
> 
> I would only allow ICMP (pings) from local hosts (or better still no hosts at 
> all).
> 
> Just makes it a little bit harder to detect for script kiddies...

Disagree; ICMP is needed for path mtu discovery and other stuff. Things 
can *appear* to work but may fail in interesting ways for a small number 
of people if you block it. Realistically, the fact that it's on the 
internet (i.e. has a global IPv4 address) means it will be scanned for 
vulnerabilities frequently; blocking ICMP won't change that significantly.

Dave





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