ggsn ggsn0 apn inet46 gtpu-mode tun tun-device tun46 type-support v4v6 ip prefix dynamic 176.16.32.0/20 ip dns 0 172.18.3.201 ip dns 1 8.8.8.8 ip ifconfig 176.16.32.0/20 ipv6 prefix dynamic 2001:780:44:2100:0:0:0:0/56 ipv6 dns 0 fd02:db8:3::201 ipv6 dns 1 2001:4860:4860::8844 ipv6 ifconfig 2001:780:44:2100:0:0:0:0/56 no shutdown default-apn inet46 no shutdown ggsn