@jetspeed – Ok, I believe the following will block all port 53 requests from LAN to WAN, but never tested this on the DSL-AC88U. Go to Firewall > Network Services Filter to block port 53 TCP and UDP. as Network Services Filter only impacts LAN to WAN traffic and this should create entries in the iptables automatically. For ASUS, I believe all ports from WAN to LAN are closed by default, so ports are only opened by LAN traffic heading to default gateway , (UPnP – Port Forwarding) etc. Let us know how this goes ?
Thank you! This looks like what I’m after, but somehow can’t add port 53 without first adding a source IP? When adding port 53, it just disappears – no error message, no nothing.
I’m using FW503 and screen looks slightly different?
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