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Old 01-09-2004, 03:55 AM   #1
Registered: Oct 2003
Location: Dhaka,Bangladeh
Distribution: Red Hat
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I am looking for help on service Port Sacn

Hi There
I have got RH 7.2, Looking for help on about service port scan and block an fix any service????


Old 01-09-2004, 04:26 AM   #2
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Nmap is a great port scan.

Old 01-09-2004, 08:04 AM   #3
Registered: Oct 2003
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Distribution: Red Hat
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Port Scanning


Thanks for your reply...As you may be know I am new on RH Would you plz make me clear about Nmap or twantrd like that.Actually I want to see whice type of command i can use to see all port of services and how i can block a service port or how I can fix any service port...


Old 01-09-2004, 08:43 AM   #4
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You can "block" ports using at least two ways:

1. Disable the service altogether. This is recommended. If you don't need a specific service you shouldn't be running it at all, period. Read the Redhat docs on how to do this the Redhat way, I know Redhat provides tools for configuring which services should be started on boot (or on request through inetd/xinetd).

2. Block access to the port using either a firewall (hardware or software doesn't really matter). Linux comes with iptables/netfilter that is an excellent software firewall (and it's a lot more too).

To scan the commonly used ports on your system do nmap localhost. Many of the advanced nmap options require you to run it as root.

Old 01-09-2004, 08:44 AM   #5
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If you just want to see open ports on your own machine try "netstat -tulanp"(as root), for blocking them look for info on iptables(or ipchains, not sure about rh7.2), try redhat-config-services if you want to disable them from starting on boot.


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