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Special Forums IP Networking how to find port numbers a web server is listening to Post 302102386 by maheshwin on Wednesday 10th of January 2007 06:02:08 AM
Old 01-10-2007
Quote:
Originally Posted by maheshwin
u can write the script in shell for a particular task of listing

in linux we have commands
lsof -i TCP (displays online open tcp ports)
lsof -i UDP
above commands work for linux only

netstat -anp | head -20

nmap -anp ( if the nmap utility is installed in linux system)


thru netstat only we can get much of the information regarding the open ports

sockstat works on BSD
netstat can be used for unix platform of solaris,hpux
 

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netstat-nat(1)						      General Commands Manual						    netstat-nat(1)

NAME
netstat-nat - Show the natted connections on a linux iptable firewall SYNOPSIS
netstat-nat [options] DESCRIPTION
netstat-nat Displays NAT connections managed by netfilter/iptables which comes with the > 2.4.x linux kernels. The program reads its information from '/proc/net/ip_conntrack' or '/proc/net/nf_conntrack', which is the temporary conntrack-storage of netfilter. OPTIONS
-h displays help -n don't resolve IPs/portnumbers to host/portnames -p <protocol> display NAT connections with protocol selection (see /etc/protocols) -s <source host> display connections by source IP/hostname -d <destination host> display connections by destination IP/hostname -S display SNAT connections -D display DNAT connections -L display only connections to NAT box self (doesn't show SNAT & DNAT) -R display only connections routed through the NAT box (doesn't show SNAT & DNAT) -x extended view of hostnames -r <src|dst|src-port|dst-port|state> sort connections -o no output header -N display NAT box connection information (only valid with SNAT & DNAT) -v prints version FILES
/proc/net/ip_conntrack or /proc/net/nf_conntrack SEE ALSO
http://www.tweegy.nl/projects/netstat-nat/ http://www.netfilter.org/ AUTHOR
netstat-nat has been written by D.Wijsman danny@tweegy.nl The manual page has been written by marceln@xs4all.nl July 2002 netstat-nat(1)
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