Paul, Thanks for the reply. I'm confused. The SLA contains an icmp-echo directed through a specific interface (the primary):icmp-echo 8.8.4.4 source-interface GigabitEthernet0/0as such, there's no need to be concerned about 8.8.4.4 being reachable th...

I've been researching making dual WAN failover with WAN addresses determined by DHCP. I've tested the configuration below by power cycling my primary modem. Here's what works for me: track 40 ip sla 40 reachability ip sla 40 icmp-echo 8.8.4.4 sourc...