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Full Discussion: opening ports
Special Forums Cybersecurity opening ports Post 16756 by PxT on Wednesday 6th of March 2002 12:58:48 PM
Old 03-06-2002
Redhat 7.2 sets up an iptables-based firewall for you automatically during installation. To open a tcp port use something like:

iptables -A INPUT -s <source-ip/wildcard> -p tcp -m tcp --dport <port-number> -j ACCEPT


See the official HOWTo from one of the iptables authors here: http://netfilter.samba.org/unreliabl...WTO/index.html

See also: the iptables man page.

RedHat also comes with a GUI firewall configuration tool I believe.
 

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IPTABLES-SAVE(8)						  iptables 1.6.1						  IPTABLES-SAVE(8)

NAME
iptables-save -- dump iptables rules to stdout ip6tables-save -- dump iptables rules to stdout SYNOPSIS
iptables-save [-M modprobe] [-c] [-t table] ip6tables-save [-M modprobe] [-c] [-t table] DESCRIPTION
iptables-save and ip6tables-save are used to dump the contents of IP or IPv6 Table in easily parseable format to STDOUT. Use I/O-redirect- ion provided by your shell to write to a file. -M, --modprobe modprobe_program Specify the path to the modprobe program. By default, iptables-save will inspect /proc/sys/kernel/modprobe to determine the exe- cutable's path. -c, --counters include the current values of all packet and byte counters in the output -t, --table tablename restrict output to only one table. If not specified, output includes all available tables. BUGS
None known as of iptables-1.2.1 release AUTHORS
Harald Welte <laforge@gnumonks.org> Rusty Russell <rusty@rustcorp.com.au> Andras Kis-Szabo <kisza@sch.bme.hu> contributed ip6tables-save. SEE ALSO
iptables-apply(8),iptables-restore(8), iptables(8) The iptables-HOWTO, which details more iptables usage, the NAT-HOWTO, which details NAT, and the netfilter-hacking-HOWTO which details the internals. iptables 1.6.1 IPTABLES-SAVE(8)
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