A routed gateway (RG) with a fixed-wireless WAN link can get an IPv4 address and an IPv6 /128 address using DHCPv4 and DHCPv6 IA_NA, respectively. The RG can also get an IPv6 prefix using DHCPv6 PD for its LAN. A fixed-wireless RG can be an RG with integrated LTE or 5G modem, or connected to an external 5G modem using Ethernet or WLAN. After the default bearer and PDU session is created using NAS signaling, DHCP messages can be forwarded by the RG (with integrated modem), or the standalone modem (referred to as user equipment (UE)), over the default bearer toward the BNG, which functions as fixed-wireless gateway and terminates the GTP tunnel. DHCP messages are received and sent by the BNG over the GTP tunnel.