netstat

[srinivasa rao vaddadi]

how can i check what are all the ports (used and unused) allocated to my server.
And how can we decide which port belongs to which application or ...

[Arunvijai_4]

Check with /etc/services and # netstat -na

-Arun

[GGA]

hello

under /etc/services u can see all ur ports
if u install an applikation it should make a entry in this file

netstat -a
man netstat

regrads gga

[Joseph Loo · Accepted solution]

hi,

so, how is your patch installation?

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=968532

guess u have not assign any points:

http://forums1.itrc.hp.com/service/forums/pageList.do?userId=CA1323105&listType=unassigned&forumId=1

ports your server is listening to:
# netstat -an|grep -i listen

ports your server has establish connection:
# netstat -an|grep -i estab

regards.

[AwadheshPandey]

man netstat


check ur /etc/services file to view all informations.

Awadhesh

[Muthukumar_5]

b) how can we decide which port belongs to which application?

Ports and service name allocation is done based on /etc/services file.

It will be like,

servicename port number/protocol

a) how can i check what are all the ports (used and unused) allocated to my server?

You can check with netstat or lsof (free downloadable tool).

i) Using netstat
# netstat -na | grep -w

ii) Using lsof
# lsof -P

-Muthu

[RAC_1]

netstat -an
lsof -i tcp
lsof -i udp

[srinivasa rao vaddadi]

thanku all for the quick response.
i got thr. netstat -nr.

[Arunvijai_4]

You can download lsof from,
http://hpux.connect.org.uk/hppd/hpux/Sysadmin/lsof-4.76/

Man page is at
http://hpux.connect.org.uk/hppd/hpux/Sysadmin/lsof-4.76/man.html

-Arun

[Muthukumar_5]

netstat -nr is used for getting routing entries not port information. Use netstat -in :)

-Muthu

[Senthil Prabu.S_1]

Check the /etc/services to find of services that are running on your service. These services will be using 0 -1024 standard ports.


Man netstat to find the list of options to find the various port that are open on your machine.

And also use port scanners like nmap to find the various ports opened and services running using those ports.

HTH,
Prabu.S

[沈國維]

netstat -a list all port status.

And this is a common tcp port usege.

[Matthew Ghofrani]

One important item to grep for is LISTEN in netstat.
"netstat -an|grep LISTEN"
This would show all the active listen ports which shows a lot more than /etc/services and the reason is that applications could start their on ports outside of /etc/services.

Matthew from Boston

[srinivasa rao vaddadi]

thanku all , i got the answer by using netstat -an

[rick jones]

A small but sematicaly important nit - the /etc/services file does not really "allocate" a port number - at least not in the sense of "reserving" it in any enforced way. It merely maps a port number to a more human friendly name. Actual _use_ of a given port number is on a first-come, first-served basis.

And just because something appears in /etc/services, it does not mean that service is active on the system - there are many many many more things in /etc/services than are enabled - perhaps even available - on HP-UX.

A port is only in use if you see it in netstat or lsof output.