In-use Network Ports

[Jeff Kinz]

On Mon, Mar 21, 2005 at 07:03:57AM -0800, Bone Randy wrote:
> Under Red Hat Enterprise 3 WS, is there a command to
> verify that a particular network port is in use? Is
> there a file where port information is stored? 


uh, socklist? 

(try the "apropos" command for these types of questions)

# socklist
type  port      inode     uid    pid   fd  name
tcp  32768       1124      29    828    6  rpc.statd
tcp  32769       1323       0   1478    2  fam
tcp    515       1373       0   1095    5  lpd
tcp    139       1534       0   1259    9  smbd
tcp    111       1067       0    800    4  portmap
tcp   6000       1603       0   1322    1  X
tcp     22       1278       0   1029    3  sshd
tcp     25       1421       0   1124    4  sendmail
tcp    139     635224       0  12671    5  smbd
udp  32768       1121      29    828    5  rpc.statd
udp    514       1038       0    775   25  syslogd
udp    137       1542       0   1264    8  nmbd
udp    137       1539       0   1264    6  nmbd
udp    138       1543       0   1264    9  nmbd
udp    138       1540       0   1264    7  nmbd
udp  33336     360970       0   2273    7  tcpdump
udp  33337     360974       0   2273    8  tcpdump
udp  33601     635225       0  12671   12  smbd
udp  33736     722428       0   2273    9  tcpdump
udp  33256     253080       0   2273    4  tcpdump
udp  33257     253084       0   2273    5  tcpdump
udp  33258     253092       0   2273    6  tcpdump
udp   1004       1105       0    828    4  rpc.statd
udp    111       1066       0    800    3  portmap
-- 
"The only system which is truly secure, is one which is switched off
and unplugged, locked in a titanium lined safe, buried in a concrete
bunker, surrounded by nerve gas and very highly paid armed guards. Even
then, I wouldn't stake my life on it" - Gene Spafford 
(Good thing. the law of unintended consequences: A laptop, w/wireless
NIC and wake on "date" set in the BIOS)

http://kinz.org
http://www.fedoranews.org
Jeff Kinz, Emergent Research, Hudson, MA.