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