1:1 NAT



  • Generally speaking, I'm pretty good with VPN's and NAT and all the networking stuff. But for some reason I'm having trouble with this.

    Oversimplified description:
    I have a pfsense device whose sole function is to do NAT between a 10.x.x.x/24 network, and a 192.168.x.x/24 network.  I connected the WAN side to 10.x.x.x/24, and the LAN is 192.168.x.x/24.  Ideally, I would like a range of IP's to be 1:1 nat'd in both directions, and all traffic passed.  But since that was proving more difficult than expected, I'm aiming low now, just trying to get SOMEthing to work.

    I went into NAT.  No port forwarding.  No 1:1.  Outbound automatic.
    I went into Interfaces / WAN.  Clear the checkboxes for blocking private and bogon networks.
    I went into Firewall Rules.  The WAN and LAN interfaces each have one rule:  permit everything.

    By using packet capture on pfsense I monitor traffic while I do this:
    Using a 192.168.x.x client, I set static route to the 10.x.x.x network via the pfsense box.  I ping a 10.x.x.x client.
    In the packet capture, I see the ICMP Echo Request come in the LAN interface.  I see the Echo Request go out the WAN interface, successfully NAT'd to the 10.x.x.x IP address of pfsense.  I see the Echo Reply come back.  But the Echo Reply does not go to the 192.168.x.x network.  It seems pfsense NAT is forgetting about the connection, or firewall blocking.

    I go to System Logs / Firewall.  (Clear the log, repeat the above tests).  Nothing new appearing in the log.



  • Not sure what changed.  I just ran through the Setup Wizard, entering all the same stuff that was already there.  And then it started working.  Maybe it just needed a reboot?


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