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...em scenario I describe was reported previously in the Shorewall lists but its resolution does not seem to have made it into the lists. Scenario: Windows XP client seeking to establish a VPN connection to a Windows 2003 Server located behind a Shorewall firewall (running on Mandrake kernel 2.4.22-37mdk). The connection cannot be made, the client reports error code 721. Discussion: Using tcpdump, one can see the client and server talking to each other. Towards the end of this dialogue the client asks the server to call it back on such-and-such a port, the server tries to do this but the firewa...

This is some ramblings on why using proxy ARP (on a host in a DMZ) is a good or bad thing. The good is that a computer X retains a public IP address which makes it easy to connect it directly to the net if the firewall has to be taken down for extended periods. Thus, if computer X is a mail server for example, it can still function in a reduced capacity until the firewall is restored. The bad

I don''t think this has anything to do with Shorewall but I am not too familiar with iptables stuff yet so I''m not sure. Running Shorewall shorewall-1.4.9 on Mandrake Linux release 9.2 (FiveStar) for i586 Kernel 2.4.22-37mdk. Run "nmap -sP 192.168.x.x/24" (for example), where 192.168.x.x/24 is the LAN. You can do this from a firewall/router, or even from a single-interface computer that only runs Shorewall for its own protection. Then run "shorewall show connections" and you will see a bunch of unr...