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Linux IP Masquerade HOWTO
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7.33. ( Netstat ) - I'm trying to use the NETSTAT command to show my Masqueraded connections but its not working

There might be a problem with the "netstat" program in 2.0.x-based Linux distros. After a Linux reboot, running "netstat -M" works fine but after a MASQed computer runs some successful ICMP traffic like ping, traceroute, etc., you might see something like:

masq_info.c: Internal Error `ip_masquerade unknown type'.

The workaround for this is to use the "/sbin/ipfwadm -M -l" command. You will also notice that once the listed ICMP masquerade entries timeout, "netstat" works again.

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( MULTIPLE IPs - DMZ segments) - I have several EXTERNAL IP addresses that I want to PORTFW to several internal machines. How do I do this?Up( VPNs ) - I would like to get Microsoft PPTP (GRE tunnels) and/or IPSEC (Linux SWAN) tunnels running through IP MASQ

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