![]() #PASSTHROUGH MAC ADDRESS ON ROUTER UPGRADE#This can occur as a result of repeated repair issues or if you upgrade service that requires pair bonding.Ĭongratulations! You now pay for a small slice of the web. If your line must be moved to a different port on another card on your VRAD, it is possible you may be assigned to a completely different public subnet range. If your RG fails or must be replaced for any reason, you will lose the existing assigned IP address and obtain a new one, typically from the same range. If your RG goes offline for more than 2 weeks you may be assigned a new IP address. The lease reservation interval is believed to be 2 weeks. Even a factory reset of the gateway doesn't change the IP address. Users have seen their IP address not change in 6+ years as long as the gateway has stayed the same. ![]() If it is allowed, the gateway will obtain a DHCP address which becomes registered to its MAC address as the reserved IP of that gateway. The U-verse provisioning system challenges the RG for an 802.1x device certificate on the gateway and verifies that the modem is allowed on the network. In the case of U-verse, the IP is tied to the MAC address of the Residential Gateway (RG) or router that AT&T provides you. A more technical name for it is a DHCP reservation. U-Verse uses a type of DHCP called Static DHCP. The long answer is much more complicated.
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