add source nat to the egress interface in the advanced tab of the policy.
set policy id 45 from "guest" to "Untrust" "Any-IPv4" "Any-IPv4" "ANY" nat src permit log
add source nat to the egress interface in the advanced tab of the policy.
set policy id 45 from "guest" to "Untrust" "Any-IPv4" "Any-IPv4" "ANY" nat src permit log