Hi Hendrik, I don't need to make any special arrangements with my email provider or ISP.
When I retrieve email, it is from spamcop.net. The two NAT firewalls don't really impact this at all. When I send mail, I send it through shawmail and again the two NAT firewalls don't impact this. Here's a text diagram of what happens during POP3 email retrieval: MyComputer => Interior FW => Exterior FW => spamcop.net The connection from my computers perspective is: 192.168.1.136:<random port> to spamcop.net:110 The Interior FW has the same perspective on it's LAN connection (192.168.1.1) The Interior FW then NATs this. On the WAN side it looks like: 192.168.0.2:<random port> to spamcop.net:110 The ExteriorFW has this perspective on it's LAN connection (192.168.0.1) The ExteriorFW then NATs this. On the WAN side it looks like 70.73.175.139:<random port> to spamcop.net:110 Both NAT devices maintain a mapping between the IP_Address:Port number from the LAN side to the IP_Address:Port number on the WAN side. It is this mapping that allows the NAT device to deliver the returning packets to the correct internal IP_Address:Port. Hope that helps, John Jardine On Thu, 2009-01-08 at 12:52 -0700, Hendrik Schaink wrote: > John, further to routing incoming e-mail through two firewalls: do you > have a special subscription / arrangement with your ISP that allows > private servers on your iternal network? Do you use static IP? Do you > have dynamic IP and dyndns.org / zonedit.com ? > > Thank you, > > Hendrik > > > John Jardine wrote: > > For those that would like copies of the slides from my Jan 7th > > presentation - you can download them from: > > http://clug.ca/node/585 > > > _______________________________________________ > clug-talk mailing list > [email protected] > http://clug.ca/mailman/listinfo/clug-talk_clug.ca > Mailing List Guidelines (http://clug.ca/ml_guidelines.php) > **Please remove these lines when replying _______________________________________________ clug-talk mailing list [email protected] http://clug.ca/mailman/listinfo/clug-talk_clug.ca Mailing List Guidelines (http://clug.ca/ml_guidelines.php) **Please remove these lines when replying
