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> Opening Up Ports On The Machine
post Dec 30 2003, 09:36 AM
Post #1

Whats this Lie-nix Thing?

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How do I open up specific ports on my Red Hat Enterprise Linux machine or even check to see which ones are open? Thanks.

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post Dec 30 2003, 09:23 PM
Post #2

Its GNU/

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RHEL uses iptables as it's firewall.

You can make coarse adjustments using the Menu - System Settings - Security Level option (ie, checking www opens port 80 and 443 in for everyone ... checking ssh opens port 22 from everywhere, ect.) Here are the details from the RHEL SysAdmin Guide

You can see the current ruleset by editing the file:


and man iptables gives you all the commands that can be used.
RedHat has a little bit about iptables in Chapter 7 of the RHEL Security Guide and here is some info from the RHEL Reference Guide. BTW, here are all the RHEL docs at RedHat.
You can find how-to's and lots of information and scripts for iptables {also know as netfilter} from .

Johnny Hughes
Enterprise Alternatives: CentOS, WhiteBoxEL
Favorite Workstation Distros (in order): CentOS, Gentoo, Debian Sarge, Ubuntu, Mandrake, FedoraCore, Slackware, SUSE
Favorite Server Distros (in order): CentOS, WhiteBoxEL, Debian Sarge, Slackware, Mandrake, FedoraCore, Gentoo, SUSE
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