Re: ports in use

[Sven Burgener <svenb@bluewin.ch>]

Hello Owen

On Fri, Aug 18, 2000 at 06:18:33PM -0400, Owen G. Emry wrote:
> Sorry for such a lame-brained question.

Better than not asking at all. :)

> What tool can I use to see which ports various processes are listening on?

netstat is quite informative:

# netstat --help
usage: netstat [-veenNcCF] [<Af>] -r         netstat {-V|--version|-h|--help}
       netstat [-vnNcaeol] [<Socket> ...]
       netstat { [-veenNac] -i | [-cnNe] -M | -s }

        -r, --route              display routing table
        -i, --interfaces         display interface table
        -g, --groups             display multicast group memberships
        -s, --statistics         display networking statistics (like SNMP)
        -M, --masquerade         display masqueraded connections

        -v, --verbose            be verbose
        -n, --numeric            dont resolve names
        -N, --symbolic           resolve hardware names
        -e, --extend             display other/more information
        -p, --programs           display PID/Program name for sockets
        -c, --continuous         continuous listing

        -l, --listening          display listening server sockets
        -a, --all, --listening   display all sockets (default: connected)
        -o, --timers             display timers
        -F, --fib                display Forwarding Information Base (default)
        -C, --cache              display routing cache instead of FIB

  <Socket>={-t|--tcp} {-u|--udp} {-w|--raw} {-x|--unix} --ax25 --ipx --netrom
  <AF>=Use '-A <af>' or '--<af>' Default: inet
  List of possible address families (which support routing):
    inet (DARPA Internet) inet6 (IPv6) ax25 (AMPR AX.25) 
    netrom (AMPR NET/ROM) ipx (Novell IPX) ddp (Appletalk DDP) 

> Is there a good place where I can find information like this without 
> cluttering up this mailing list?

When I encounter problems, I usually dig around at google.com /
mail-archive.com or the Debian site.

HTH
Sven