Configure the Firewall, Configuration Security Firewall

Click OK

2.4 Configure the Firewall

The firewall should be configured to monitor the ICMP requests generated by PPP 1. If the firewall detects that 3 consecutive ICMP echo requests have failed, it will take PPP 1 out of service and deactivated thus allowing PPP 4 to come up. The IP address in the firewall rule must be the IP address that PPP 1 is sending pings to.

The recovery code will then test the ADSL connection before bringing it back into service. When the recovery is successful and PPP 1 comes back into service, PPP 4 will be deactivated.

Configuration – Security > Firewall

Insert the following 2 rules:

Rule 1

pass out break end on ppp 1 proto icmp from any to 1.2.3.4 icmp-type echo inspect-state oos 10 t=3 c=3 d=3 r=ping,10,5 rd=1 dt=1

Rule 2

Pass break end

Save the firewall rules by clicking the “Save (fw -> fw.txt)” button.

Rule 1 explained:

pass out break end on PPP 1 – allow traffic outbound from PPP 1

proto icmp from any to 1.2.3.4 icmp-type echo – allow pings out to 1.2.3.4