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Full Discussion: firewall vs. closing ports
Special Forums Cybersecurity firewall vs. closing ports Post 15047 by Neo on Saturday 9th of February 2002 03:09:13 AM
Old 02-09-2002
Good question.

If I'm not mistaken, unless specifically denied or not configured in the kernel (ICMP) an IP interface properly configured with ifconfig will respond to ICMP ECHO_REQUESTS independent of sockets bound to listening processes.

Having said that, it is not difficult to install kernel level filtering software on most of our favorite UNIX systems to stop this 'normal' behavior. "Deny ICMP filters" are fairly common practice these days.
 

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