Gateway Assistant - My Changes Afterward Not Working

Folks;
I have used the Gateway Assistant (GA) and it does ALMOST what I need.
It doesn't let me have any say so in the IP assignments and I cannot re-IP the network for GA's sake... So I have to make IP changes afterwards.
I have 2 NICs and I want: NAT; DHCP and VPN -> looks like GA is a good fit.
I let 'er rip and sure enough when I cable in a single machine and use the DHCP server I get an address in the default range and can connect the the VPN client as it is configured by GA. I can see a web page. Cool.
So now I have to change the IP settings. The BuiltIn ENet is fine - GA leaves it alone. It's the second NIC that GA messes with.
In Server Admin I stop DHCP, NAT, FIrewall, and VPN.
In DHCP I change the range to be in my 192.168.x.a - 192.168.x.b range and change the Router to my desired: 192.168.x.y. I also change the NameServers to be relevant.
In VPN, I change the IP range to 192.168.x.c - 192.168.x.d, making sure it does not intersect with the DHCP range.
In Firewall, I create a new AddressGroup (192.168.x-net) and set then edit the 'Services' for this address group to be 'Allow all traffic'. I then delete the superfulous '192.168.2-net' group.
Now finally there is the SystemPrefernces where the IP of the NIC itself needs to be from the default assignment of 192.168.2.1 to my address of 192.168.x.y.
I set both the IP and Router address to 192.168.x.y just like GA had done.
I reboot the machine and then turn the services back on.
I have a single machine cabled to the NIC and DHCP and VPN will both work.
I get an address and a VPN connection.
BUT (you knew that was coming, right?)
That's the end of the road. No ping, no web page, no printer.
What have I forgotten to do that GA is doing when it sets it to working?
My gut says its a firewall issue but my head hurts from the banging it has taken today in dealing with this.
(My manager's stress level ain't so great either....)
I have not used 'changeip' cause I'm not sure it is needed and I'm not sure it works on en1.
Somebody have mercy on me, please?
Steve

It's probably a firewall issue.
Turn on logging of denied packets to see whats blocked.
Depending on what rules you have there might be a need for a rule allowing traffic in from the ppp0 interface (VPN).
If you want rules to allow everything from LAN/VPN in and automatically be creating temporary rules for returning packets you could enter it yourself in the Advanced firewall settings (it's a bit tricky but can be done) or by using Terminal to add it (to the rule list not changed by the firewall GUI).
Such a rule needs to end with: "check-state", something like :
allow ip from <LAN IP range> in via en1 check-state
allow ip from <LAN IP range> in via ppp0 check-state
or for all interfaces at once:
allow ip from <LAN IP range> in check-state
(using a low row number to get the rule near the top of the list - beginning)
And/or for answers to DNS requests returning from Internet (if you are not using you own server for DNS) you might need a rule: allow 53 from any to <LAN IP range> udp in (I might have entered these in the wrong order - you figure it out) at least if "check-state" is not present.
Haveing matching hostname - IP-number - DNS name is important for some services, forward and reverse lookup should work.
I usually leave the router field empty on the LAN interface.

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