How to drop ping silently??

Guilherme Cesar Soares Ruppert <ruppert@xxxxxxxxxxxxxxxxx> · Thu, 27 Jan 2005 10:14:47 -0200 (BRST)

When I filter echo requests (pings) in the OUTPUT chain, the ping program 
says "sendmsg: Operation not permitted".

% iptables -A OUTPUT -p icmp --icmp-type echo-request -j DROP
% ping 10.1.1.2
PING 10.1.1.2 (10.1.1.2) 56(84) bytes of data.
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
...

Is there any whay to drop these packet silently, without let the ping know 
that he was blocked. I am programamming an application and I need this 
behavior. I want that ping believes that his packets were sent, but in 
fact, they were dropped.

Is it necessary to write a netfilter module to do that? Or is that 
impossible to do in the netfilter architecture?

Tks

Guilherme Ruppert