If your Router isn't receiving the IP address, maybe it's still working on that 99 day lease and isn't asking for a new lease.  Can you force it to give up the old lease?

I performed an software update on the router last night in the hopes that it would do some good. As a part of that refresh, I assumed the unit would restart and grab a new IP (from the Gateway with a now 10 min lease time). I will power cycle both the Gateway and Router this morning and report back.

Is the BGW320 known for retaining settings against the users will? I know that the old TP Link router I used to use would tell me something had changed when indeed it had not. I just don't understand why it would give out an IP from its DHCP pool unless it thinks it's still a router. And I thought that changing it to IP Passthrough would basically tell it to knock that off.

A friend stopped by to help out and set IP Passthrough to DHCPS-Dynamic. This lead to my router immediately being assigned the proper WAN IP address, instead of the LAN address it was previously assigning. We have no clue why DHCPS-Fixed didn't work, but we know that Dynamic did. Note to self, don't be afraid to play with the buttons and reset. :)

Thanks, JefferMC, for trying to help.

The DHCP-Dynamic setting means that the first device to request an IP address on your Gateway will be treated as the IP Passthrough target.  So do not connect anything else to the Gateway in order for this to be reliable.

If that is a problem, you could still do manual.

Thanks again. I won't connect anything to the gateway. I might try manual or fixed again down the road. At this point I'm a bit weary to even touch it. Will post back if anything changes.

I still don't understand why DHCPS-Fixed didn't work. And that's a bit unnerving.

@cerbera79 I had a similar experience/symptoms with a BGW320 and a UDM Base.  The problem was that I was entering the MAC addr displayed on the UDMB GUI homepage in the BGW passthrough page.  Turns out that addr is not the MAC addr of the WAN port (it's one of the LAN interfaces in the case of the UDMB)

I ssh'ed into the UDM and got the interface list via an ifconfig.  I could see which interface had the public IP (eth4 for the UDMB).  Went back to the BGW IP Passthrough page and set it for DHCPS-fixed with that MAC addr and everything works: UDMB GUI homepage shows the public IP.

This thread got me pointed in the right direction.  Thanks.

I just had my fiber installed today and am having this exact same problem.&n(Edited per community guidelines)p; &n(Edited per community guidelines)p;in my case, i thought that marcg1 had it figured out.&n(Edited per community guidelines)p; This is not the case here.&n(Edited per community guidelines)p; i was and am using the mac address from the GUI and it turns out that it is the one that the wan port is using.&n(Edited per community guidelines)p; &n(Edited per community guidelines)p;I can NOT make this stupid thing get the wan ip from the BGW so am unable to get passthrough to work properly.&n(Edited per community guidelines)p; &n(Edited per community guidelines)p;I have had my share of (Edited per community guidelines) from att devices and att in general and knew that I would have a difficult time with this, but this takes the cake.

🏆

That might be a new record for highest ratio of banned words/acceptable words.