Some time ago, I successfully whitelisted my ISP, see this thread for reference: Can't make postoverflow whitelist to work.
Now, I’d like to whitelist only my residential IP address, as all Orange/Wanadoo addresses is way too much for a whitelist
Problem: my home IP address may vary in time.
In my ISP router (LiveBox), I successfully setup a dynamic DNS (freeddns.org) for A record.
But I can’t change the reverse (PTR), Orange won’t allow.
So, question is: how to write a PostOverflow whitelist, using my dynamic A DNS record (myhome.freeddns.org)?
Or: can we compare the IP address with a forward DNS (A) request result, in expression ?
Any idea welcome, thanks in advance!