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Which application has a TCP socket open

 
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Top Forums UNIX for Dummies Questions & Answers Which application has a TCP socket open
# 1  
Old 10-25-2005
Which application has a TCP socket open
If I do a netstat -a I can see all the sockets currently open, is there a way that I can tell which application is holding open these sockets ?
# 2  
Old 10-25-2005
Use the public domain program called lsof.
# 3  
Old 10-25-2005
At least one known implementation of netstat, i.e. the Linux version I use here, has the -p option to see the program ID/executable. It's probably an extension.

Example:

Code:
[root@bernardchan root]# netstat -ap
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 localhost:32768         *:*                     LISTEN      1425/xinetd
tcp        0      0 *:32769                 *:*                     LISTEN      -
tcp        0      0 *:nfs                   *:*                     LISTEN      -
tcp        0      0 *:cvspserver            *:*                     LISTEN      1425/xinetd
tcp        0      0 *:ldap                  *:*                     LISTEN      6332/slapd
tcp        0      0 *:1000                  *:*                     LISTEN      1245/rpc.ypxfrd
tcp        0      0 *:649                   *:*                     LISTEN      892/ypserv
tcp        0      0 *:mysql                 *:*                     LISTEN      1878/mysqld
tcp        0      0 *:942                   *:*                     LISTEN      1611/rpc.mountd
tcp        0      0 *:pop3                  *:*                     LISTEN      1425/xinetd
tcp        0      0 *:sunrpc                *:*                     LISTEN      811/portmap
tcp        0      0 *:http                  *:*                     LISTEN      2062/httpd2
tcp        0      0 *:10000                 *:*                     LISTEN      1906/perl
tcp        0      0 *:ftp                   *:*                     LISTEN      1819/proftpd: (acce
tcp        0      0 bernardchan.loca:domain *:*                     LISTEN      1377/named
tcp        0      0 localhost:domain        *:*                     LISTEN      1377/named
tcp        0      0 *:ssh                   *:*                     LISTEN      1401/sshd
tcp        0      0 *:39831                 *:*                     LISTEN      6394/artsd
tcp        0      0 *:ipp                   *:*                     LISTEN      1470/cupsd
tcp        0      0 localhost:smtp          *:*                     LISTEN      1774/master
tcp        0      0 localhost:rndc          *:*                     LISTEN      1377/named
tcp        0      0 *:634                   *:*                     LISTEN      876/rpc.statd
tcp        0      0 *:https                 *:*                     LISTEN      2062/httpd2
tcp        0      0 *:ldaps                 *:*                     LISTEN      6332/slapd
udp        0      0 *:32768                 *:*                                 1377/named
udp        0      0 *:nfs                   *:*                                 -
udp        0      0 *:32770                 *:*                                 -
udp        0      0 *:646                   *:*                                 892/ypserv
udp        0      0 *:10000                 *:*                                 1906/perl
udp        0      0 *:939                   *:*                                 1611/rpc.mountd
udp        0      0 bernardchan.loca:domain *:*                                 1377/named
udp        0      0 localhost:domain        *:*                                 1377/named
udp        0      0 *:956                   *:*                                 1627/rpc.yppasswdd
udp        0      0 *:998                   *:*                                 1245/rpc.ypxfrd
udp        0      0 *:sunrpc                *:*                                 811/portmap
udp        0      0 *:628                   *:*                                 876/rpc.statd
udp        0      0 *:ipp                   *:*                                 876/rpc.statd

Active UNIX domain sockets (only servers)
Proto RefCnt Flags       Type       State         I-Node PID/Program name    Path
unix  2      [ ACC ]     STREAM     LISTENING     979557 6381/fam            /tmp/.fam_socket
unix  2      [ ACC ]     STREAM     LISTENING     4215   1774/master         private/old-cyrus
unix  2      [ ACC ]     STREAM     LISTENING     4219   1774/master         private/cyrus
unix  2      [ ACC ]     STREAM     LISTENING     4223   1774/master         private/uucp
unix  2      [ ACC ]     STREAM     LISTENING     4227   1774/master         private/ifmail
unix  2      [ ACC ]     STREAM     LISTENING     4231   1774/master         private/bsmtp
unix  2      [ ACC ]     STREAM     LISTENING     3557   1358/saslauthd      /var/lib/sasl2/mux

# 4  
Old 10-26-2005
That's really useful, thanks guys, my netstat does not support -p, but I have downloaded lsof

Thanks again

M
 
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