I had this little problem,
ADSL Modem "bridge" <====> WAN PPPoE 196.202.x.x/32 "m0n0wall
So I cannot ping from 10.10.0.0/16 to 196.202.x.x
And even no internet connectivity on Server holds 196.202.xx.xx/29 connected
directly to DMZ
Now I remember I had similar thing, so I added this on NAT 1:!
<https://10.10.10.1/firewall_nat_1to1_edit.php?id=0> edit mapping
<https://10.10.10.1/firewall_nat_1to1.php?act=del&id=0> delete mapping
This should disable NAT on that interface.
Seems to be ok.
<https://10.10.10.1/firewall_nat_1to1_edit.php> add mapping