On Wed, 2012-08-29 at 16:32 -0500, Kevin Martin wrote: > On 08/29/2012 03:56 PM, Arthur Dent wrote: > > On Wed, 2012-08-29 at 15:31 -0500, Dale Dellutri wrote: > >> On Wed, Aug 29, 2012 at 2:40 PM, Arthur Dent [snip] > > > > I think you are getting in a loop as it doesn't appear that you are NATing incoming traffic. So what happens is that the traffic > from, say, 192,168.2.3 goes to example.org but the ip info is not nat'd so the mail server on 192.168.2.2 answers directly to > 192.168.2.3 but the client is expecting the data to come back from example.org so you get a nasty circular routing issue. You > should probably nat the incoming traffic to 192.168.2.2 over your router so it looks like it's coming from the router and get's > routed back to the router. Then the router can redirect the traffic back to where it needs to go. > > Kevin Thanks! OK - That seems to describe the symptoms I am seeing. I have two questions: 1) Why did I never run into this before (I have run every version of Fedora since before it was fedora - although as a server only since about Fedora 8) Has something changed? 2) So what do I have to do? I have heard the term NAT before, but never needed to do anything about it. Do I need to set up an iptables rule? If so what exactly? Can I use system-config-firewall (my favourite way to set up the firewall as I am largely clueless when it come to networking - as you can see!). Thanks again Mark
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