Router cannot ping an IP-Camera attached to a switch

Doh, ICMP of course!! I have the exact same setup as you and have been messing around for hours. Are far as I can tell the only thing I have done is to change the switch IP onto the same network as the router 192.168.0.nnn and enabled then disabled SNMP and suddenly everything works. I have also just updated the firmware to the latest version from the TP-link website but ping was working before I did that. In all honesty the only thing that appears to have made ping work is by enabling SNMP and now after disabling it - ping still works.

I can't explain it - and it makes no sense - but it worked!