I have installed Ubuntu Lucid on a VPS. I installed a webserver, and also a mail server (POSTFIX).

What I noticed is that some websites are continuously pinging my domain*. I have also received a number of SPAM mail that is delivered to my IP.

What I want is an utility that record every ping or request to every port in my VPS. Is there something like that?

• I noticed this reading my webserver log which showed that some sites were requesting resources (images) from some dead links on my domain