Hi Ron, Handing an IP address to the subscriber is done by the GGSN. For me, that was the easy part, the hard part being to get packets sent and received through the tunnel on the GGSN machine.
Here's what I use for osmo-ggsn.cfg and how I set up the APN: dev="eth0" apn="apn0" sudo iptables -t nat -A POSTROUTING -s 192.168.42.0/24 -o $dev -j MASQUERADE sudo sh -c "echo 1 > /proc/sys/net/ipv4/ip_forward" sudo ip tuntap add dev $apn mode tun user $USER group $USER sudo ip addr add 192.168.42.0/24 dev $apn sudo ip link set $apn up ggsn ggsn0 apn internet tun-device apn0 type-support v4 ip dns 0 192.168.0.1 ip dns 1 9.9.9.9 ip prefix dynamic 192.168.42.0/24 no shutdown default-apn internet no shutdown ggsn With this config, the apn0 tun device is set up as root, hence osmo-ggsn doesn't need to create a tun device itself and can run as a non-privileged user. HTH, ~N
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