go to:
http://www.openna.com/books/book.htm
and download the book (Securing and Optimizing Linux: Red Hat Edition).
it has info on how to stop ping and other goodies...
the secret lies in /etc/sysctl.conf
i have added the following lines in the above mentioned file:
# Enable bad error message Protection
net.ipv4.icmp_ignore_bogus_error_responses = 1
# Enable IP spoofing protection, turn on Source Address Verification
net.ipv4.conf.all.rp_filter = 1
# Log Spoofed Packets, Source Routed Packets, Redirect Packets
net.ipv4.conf.all.log_martians = 1
# Disable IP source routing
net.ipv4.conf.all.accept_source_route = 0
# Enable TCP SYN Cookie Protection
net.ipv4.tcp_syncookies = 1
# Disable ICMP Redirect Acceptance
net.ipv4.conf.all.accept_redirects = 0
hope this helps...
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