Difficulties establishing VPN tunnel with IPNAT

Jerahmy Pocott quakenet1 at optusnet.com.au
Sat Nov 24 00:48:21 PST 2007


I recently decided to give ipf and ipnat a try, previously I had  
always been using
ipfw and natd. Since switching over I can no longer establish a VPN  
tunnel from
any system behind the gateway.

I did 'ipf -F a' to flush all rules but I was still unable to connect  
so I think it's a problem
with ipnat? Also my redirect from ipnat doesn't seem to work either.

These are the only ipnat rules I have:

(fxp1 is the external interface)

# ipnat built in ftp proxy rules
map fxp1 -> 0/32 proxy port 21 ftp/tcp
map fxp1   -> 0/32 proxy port 21 ftp/tcp

# CVS Server on Fileserv
rdr fxp1 0/32 port 2401 -> port 2401 tcp/udp

# nat all out going traffic on fxp1 from internal lan
map fxp1 -> 0/32

I can post my firewall rules too if that would help, however with NO  
rules set it
still didn't work so I don't think that would help.. (I'm using the  
klm which is default
to accept?)


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