Using Meson
Install the depedencies for using Meson.
$ sudo apt install python3 python3-pip python3-setuptools python3-wheel ninja-build
Install Meson using Python
$ pip3 install --user meson
Making TUN Permanent
Write a configuration file for the TUN deivce.
$ sudo sh -c "cat << EOF > /etc/systemd/network/99-open5gs.netdev
[NetDev]
Name=ogstun
Kind=tun
EOF"
Create a TUN device. The interface name will be ogstun.
$ sudo systemctl enable systemd-networkd
$ sudo systemctl restart systemd-networkd
$ sudo apt install net-tools
$ ifconfig ogstun
ogstun: flags=4241<UP,POINTOPOINT,NOARP,MULTICAST> mtu 1500
inet6 fe80::e86e:86d8:ea24:f8ee prefixlen 64 scopeid 0x20<link>
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 500 (UNSPEC)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2 bytes 255 (255.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
Then, to support IPv6-enabled UEs, you must configure your TUN device to support IPv6.
$ sysctl -n net.ipv6.conf.ogstun.disable_ipv6
1
$ sudo sh -c "echo 'net.ipv6.conf.ogstun.disable_ipv6=0' > /etc/sysctl.d/30-open5gs.conf"
$ sudo sysctl -p /etc/sysctl.d/30-open5gs.conf
$ sysctl -n net.ipv6.conf.ogstun.disable_ipv6
0
Note: If your TUN device already supports IPv6, you can skip this steps above.
You are now ready to set the IP address on TUN device.
$ sudo sh -c "cat << EOF > /etc/systemd/network/99-open5gs.network
[Match]
Name=ogstun
[Network]
Address=10.45.0.1/16
Address=2001:db8:cafe::1/48
EOF"
Restart the TUN device
$ sudo systemctl restart systemd-networkd
Make sure it is set up properly.
$ ifconfig ogstun
ogstun: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1500
inet 10.45.0.1 netmask 255.255.0.0 destination 10.45.0.1
inet6 2001:db8:cafe::1 prefixlen 64 scopeid 0x0<global>
inet6 fe80::e86e:86d8:ea24:f8ee prefixlen 64 scopeid 0x20<link>
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 500 (UNSPEC)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 20 bytes 2019 (2.0 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
Note: On Linux, you should run open5gs-pgwd first to correctly verify the IP address of TUN device. Otherwise, the TUN device’s IP address is not displayed by the ifconfig command.