Simple NAT 1:1

[JasonArgo]

Hello,

I have  Pfsense with two newtork cards :

• LAN side : 10.8.134.0/24 and Pfsense interface : 10.8.134.253
• WAN side : ZZ.ZZ.134.0/24 (public network) and Pfsense interface : ZZ.ZZ.134.130

I want to enable NAT 1:1 between these two networks. I don't edit any Virtual IP.
If I choose NAT between 10.8.134.18 <-> ZZ.ZZ.134.129, I can go to the Internet and website like danasoft show me my IP at ZZ.ZZ.134.129. Well.
If I choose NAT between 10.8.134.18 <-> ZZ.ZZ.134.128, I cannot go to the Internet. There is no special firewall rules except LAN->WAN leave all ports in TCP/UDP protocol and block all WAN->LAN.

Is Virtual IP edition necessary ? Can my problem come pfsense configuartion outside ?