What is the exact firewall script to allow certain WAN IP as is comes into the Cellular interface of my Digi WR31 to be allowed.
The particular firewall rule would be:
pass in log break end on ppp 1 from x.x.x.x to addr-ppp 1
Where x.x.x.x would be the WAN IP address.
Because I don’t know what other rules you might have or need, I won’t be able to provide the whole set of rules.
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Thanks Peterss41, great I will try this today 
For HTTP:
pass in break end proto tcp from to any port=http flags S!A inspect-state
Any traffic
pass in log break end from to addr-ppp 1 inspect-state