Linux.com :: How to open ports on a fedora system

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hailer Joined: May 26, 2008 Posts: 19 Other Topics	Posted Sep 02, 2008 at 9:12:18 AM Subject: How to open ports on a fedora system Hi forum, I have been tinkering with ipsec for some time and it reports that a connection is established and i have made sure that all my configs work ok though i cannot ping any system on the second subnet. I ran an nmap scan and all the ports that ipsec uses are closed(port 500 and 4500) so i turned off iptables on both systems just to make sure that they were not bieng bloked by the firewall but i get the same result they are closed. How can i open the ports on both systems since i will not be using any firewall on any of the two systems. Thanks for any help
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Khabi Joined Apr 21, 2008 Posts: 121 Other Topics	Posted: Sep 03, 2008 12:40:36 AM Subject: How to open ports on a fedora system if you turned off iptables on both systems, then sounds like your problem is with the network itself. I'm willing to bet you have the netmask configured wrong. On both systems show me the output of "ifconfig -a" and I can tell you if you've got it setup correctly. Basically, you want to make sure if they're on two different subnets you're not using a netmask of 255.255.255.0. For example. if you have one machine at192.168.1.20 and another at 192.168.2.20 and both have netmasks of 255.255.255.0 then they will only be able to talk to machines on the same netmask. In the case above you want your netmask to be 255.255.0.0 . :)
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hailer Joined May 26, 2008 Posts: 19 Other Topics	Posted: Sep 03, 2008 11:34:04 AM Subject: Re: How to open ports on a fedora system [quote=Khabi] For example. if you have one machine at192.168.1.20 and another at 192.168.2.20 and both have netmasks of 255.255.255.0 then they will only be able to talk to machines on the same netmask. In the case above you want your netmask to be 255.255.0.0 . :)[/quote]
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hailer Joined May 26, 2008 Posts: 19 Other Topics	Posted: Sep 03, 2008 11:44:00 AM Subject: How to open ports on a fedora system You were absolutely right, I checked the netmask on both subnets and it seemed like i had completely over looked the netmask(both were 255.255.255.0) on changing that to 255.255.0.0 i could ping from either sides of the two subnets which is a breakthu for me. Thanks a million
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Khabi Joined Apr 21, 2008 Posts: 121 Other Topics	Posted: Sep 03, 2008 10:22:02 PM Subject: How to open ports on a fedora system no problem. Glad i could help. :)
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