221
edits
Changes
→Adding a rule
* Enable and start that service.
* Install links (a command-line web browser) and see if you can connect to http://localhost (it should work by default).
* Try to use Firefox on c7host to see the same webpage from lin1 (it you may need the IP address of lin1). Also, Firefox should not work be able to connect to that same webpage if lin1 wasn't configured to permit HTTP traffic through, which lin1 isn't configured to do by default).
* Check your iptables rules and try to figure out why Firefox cannot connect to lin1 from c7host. Read the output of <code>iptables -L</code> on lin1 carefully looking for clues that iptables on lin1 is letting inbound http traffic (TCP port 80) pass through.
* If the output of <code>iptables -L</code> on lin1 isn't letting HTTP traffic through, which by default configuration it wont, add a rule on lin1 to allow inbound traffic to Apache (TCP port 80).
* Go back to c7host after you verified that lin1 is letting http traffic through and once again verify that Firefox displays the webpage from lin1 (you may need to give Firefox the IP address of lin1).
If you make such a mess that you don't know what you did any longer, there are a couple of things that can help you get back to normal:
