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Special Forums IP Networking My router has UPnP, as do its work with ubuntu to automatically open ports Post 302486768 by Lazydog on Monday 10th of January 2011 09:14:56 AM
Old 01-10-2011
It doesn't have to do with not know or maybe it does. A question I have is why would you want to setup your connection this way? If you are going to allow a device to open ports as needed then why do you need a firewall?

I would suggest you setup a firewall to allow the ports you need to pass and forget about random ports opening.

As to your firewall rule above, if you are going to allow any IP Address then the rule should look like this:

Code:
/sbin/iptables -I INPUT -p tcp --dport 21 -j ACCEPT

I would highly suggest that you start using STATEFUL packet filtering. You can take a look at the following Tutorial for information.
 

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iptables-apply(8)					      System Manager's Manual						 iptables-apply(8)

NAME
iptables-apply - a safer way to update iptables remotely SYNOPSIS
iptables-apply [-hV] [-t timeout] ruleset-file DESCRIPTION
iptables-apply will try to apply a new ruleset (as output by iptables-save/read by iptables-restore) to iptables, then prompt the user whether the changes are okay. If the new ruleset cut the existing connection, the user will not be able to answer affirmatively. In this case, the script rolls back to the previous ruleset after the timeout expired. The timeout can be set with -t. When called as ip6tables-apply, the script will use ip6tables-save/-restore instead. OPTIONS
-t seconds, --timeout seconds Sets the timeout after which the script will roll back to the previous ruleset. -h, --help Display usage information. -V, --version Display version information. SEE ALSO
iptables-restore(8), iptables-save(8), iptables(8). LEGALESE
iptables-apply is copyright by Martin F. Krafft. This manual page was written by Martin F. Krafft <madduck@madduck.net> Permission is granted to copy, distribute and/or modify this document under the terms of the Artistic License 2.0. 2006-06-04 iptables-apply(8)
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