On Thu, Jul 12, 2001 at 12:24:17AM -0500, will trillich wrote: > How do you determine WHICH NETWORK SERVICES ARE OPEN (active)? > Try "netstat -a | grep LISTEN". To see numeric values (instead > of the common names for services using a particular port) then > try "netstat -na" instead. For more info, look at "man netstat".
As root, you can also use the '-p' option to netstat, to display the process id/name that is attached to the open port. > Curious about your NETWORK TRAFFIC? There's a whole bunch of > ways to monitor it: iptraf, showtraf, netwatch, tcpview, statnet, > or even > tcpdump | grep 'what you want to see' tcpdump has its own filter, which is much more effective in terms of resource usage. It actually compiles a filter from the specification you give it on the command line. Example: tcpdump host foo tcpdump not port ssh tcpdump port 53 tcpdump arp > lsof -i | grep 'LISTEN' lsof is different from the other tools you mention. It does not Cheers, Joost
