@Clive_A Well, I think I know what's going on. I have a Comcast Business account. After much deeper diving and more experimenting. I'm pretty sure the Comcast router is doing some very unethical and...

@Clive_A OK, this is starting to get really weird. So seeing that yours appeared to be working I started doing some experimenting. I changed the ER7206 WAN address to something completely different...

@Clive_A Stop, this has nothing to do with the ISP or DNS. You're missing the underlying point. Please answer the following question: Why is the ER7206 sending packets to the gateway address when the...

@Clive_A No, that's not how this works. The ER7206 is handing the traffic off to the wrong device. This has nothing to do with the ISP. All of this traffic is local to the ER7206, none of this...

@Clive_A traceroute to AA.BB.CCC.74 (AA.BB.CCC.74), 64 hops max 1 10.99.1.1 0.571ms 0.438ms 0.477ms 2 AA.BB.CCC.78 2.526ms 1.789ms 1.817ms 3 AA.BB.CCC.74 2.263ms 1.960ms 2.024ms The traceroute was...

I initially thought this might have been an ARP issue. But checking the ARP table through the terminal window of the ER7206 I can see that the ARP table is correct. The router definitely has the...