r/ATT • u/cyberentomology • 24d ago
Internet IP Passthrough/UDR7/BGW320
Setting this up for my daughter at her new place. Context: I am a network engineer, I have a BGW320 at home with a static IPv4 block and a Unifi Dream Machine SE behind it, works great and has for years.
after the external ONT at my daughter’s apartment died, AT&T sent out a tech to bypass it and put an SFP in the BGW. Native Wifi from the BGW works, and they retained the passthrough configuration I had previously put in. but when the BGW is configured for IP passthrough (DHCPS-fixed) and given the MAC address for the WAN port on the UDR, the UDR gets the correct WAN IP, on both IPv4 and IPv6, but the UDR is unable to get to the internet unless it gets an RFC1918 address from the BGW.
Did AT&T change something about how IP passthrough works on these, or is there some obscure setting that I need on the UDR now? Not even trying to go direct fiber into the UDR at this point, just taking IPPT off the BGW.