SH3 Modem mode with TP-Link Archer C50 external ping not working
In order to try to solve some bad network jitter and packet loss, i have turned my SH3 into modem mode and the Archer C50 into router mode with dynamic WAN which is working fine, I can access the internet and can see in the TP-Link control panel that it has obtained the IP from SH3.
However when I try to configure a thinkbroadband quality test it cannot send ICMP's or get replies from my new IP address. I also can't ping my home external IP and longer from within a google cloud vm or AWS VM. It looks like something is blocking the ping request.
In the TP-LINK firewall settings i can see the option to "Forbid ping packet from LAN port" is NOT checked. Is there any other setting that might be preventing my router from responding to ICMP packets? DoS protection is disabled.