Mikhail P. wrote:
Dear users,
I have been experimenting with simple gif tunnels (no IPSec) in local network (192.168.0.0/24). I have used the following scenario between two hosts (both running FreeBSD-5.2.1):
HOST_A [192.168.0.1]: ifconfig gif0 create ifconfig gif0 tunnel 192.168.0.1 192.168.0.2 ifconfig gif0 10.0.0.1 10.0.0.2 netmask 255.255.255.255
and on -
HOST_B [192.168.0.2]: ifconfig gif0 create ifconfig gif0 tunnel 192.168.0.2 192.168.0.1 ifconfig gif0 10.0.0.2 10.0.0.1 netmask 255.255.255.255
The above works well for me, and I can send traffic on 10.0.0.1 and 10.0.0.2.
The next thing I wanted to implement is to create similar tunnel from our local router (which is FreeBSD too) to remote server, however there is small problem which stops me - router has no public IP, and it sees internet through DSL router, so basically that router is NAT'ed behind DSL router.
As far as I understand, it appears to be that I won't be able to create such a simple tunnel, unless my router gets public IP address.
What I tried next was MPD pptp link (which is known to work behind NAT, unlike above example), but something (ISP? DSL router?) cuts GRE packets on their way, so MPD can't establish LCP connection with remote host.
I'm now in loss as to what to try next - could someone please advise what other techniques will work in my scenario (where I want to connect machine which is behind NAT and no GRE packets will go through)?
I use MPD using the "UDP" transport.
in other words packets get sent as udp packets.
I then set up IPSEC to encrypt the UDP packets..
when I had a NAT in the way I did further encapsulate the GRE packets in UDP again :-)
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