I have a UFB connection with a static IP address. I use a Fortigate firewall connected directly to the ONT - the firewall establishes the PPPoE connection so no need for a separate modem.
The Fortigate also supports failover to a secondary WAN connection if the primary WAN connection fails. I have configured the Fortigate to ping the assigned gateway address (126.96.36.199) to determine if the primary connection is up.
The problem I have is that several times recently the assigned gateway address has changed (ie: today it changed to 188.8.131.52), the ping to the old address fails and hence the health check causes the firewall to switch to the secondary connection. I have to reconfigure the health check with the new gateway address before the ping succeeds and the health check returns to normal.
Question: Is it common for the gateway address associated with a UFB static IP to change? Its happened 3 or 4 times in the last few months.
Would it be better to not ping the gateway, but instead ping something more static - such as 184.108.40.206? I assumed pinging the gateway would be less likely to cause a false positive if other non-connection specific internet faults occur.