We have a network monitoring tool which pings all devices on the network every 60 seconds.
By default the ER706 disables any ICMP messages on the WAN interface so I'm trying to setup an ACL rule to enable ICMP from a specific IP address


When I force provision the ER706W the Network Monitoring tool receives PING responses.
However, if I then stop the probe on the Network Monitor and then restart is a few minutes later the PINGs go unanswered.

This is repeatable - as soon as I force provision again the PING springs into life, only to be blocked again if I stop/restart the Network Monitor.

For the purposes of my tests the Network Monitoring tool is on 192.168.88.1 and the ER706W is on 192.168.88.87

The Groups in the ACL are:





Thanks for your help