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| author | Oliver Smith <osmith@sysmocom.de> | 2021-03-01 15:51:02 +0100 |
|---|---|---|
| committer | Oliver Smith <osmith@sysmocom.de> | 2021-03-02 09:03:09 +0100 |
| commit | 15964639857e444e3834b6c0dd5961ae50cd807a (patch) | |
| tree | 99c829fa935eb25745d394598265f301254bc166 | |
| parent | 9d82492e49e258546b360a6169156b13fcf25c50 (diff) | |
doc/manuals: describe GTP-U kernel module
Related: OS#3209
Change-Id: Ib45cbfe03077960f216a83cf500ab3203d02cb3b
| -rw-r--r-- | doc/manuals/chapters/running.adoc | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/doc/manuals/chapters/running.adoc b/doc/manuals/chapters/running.adoc index 51b8ae2..e3f6bbc 100644 --- a/doc/manuals/chapters/running.adoc +++ b/doc/manuals/chapters/running.adoc @@ -80,3 +80,47 @@ possible to pick differing ports on the same IP address), like: ggsn ggsn0 gtp bind-ip 127.0.0.2 ---- + +=== GTP-U kernel module + +WARNING: As of writing, the kernel module does not support IPv6. + +OsmoGGSN has support to use the Linux kernel GTP-U tunnel driver to accelerate +the data/user plane while still implementing the control plane (GTP-C) in +userspace in OsmoGGSN. The kernel module is included in Linux 4.7.0 and higher. +Notably the Debian GNU/Linux distribution has it enabled by default. + +In order to use this feature, make sure that your Linux kernel was configured +to support it (`CONFIG_GTP=m` or `=y`). Furthermore, `osmo-ggsn` must have been +built with `./configure` argument `--enable-gtp-linux` (which requires libgtpnl +to be installed). + +Load the kernel module with: + +---- +$ sudo modprobe gtp +---- + +Then start OsmoGGSN with a configuration file that uses `gtpu-mode kernel-gtp`. + +A full example configuration is in `osmo-ggsn-kernel-gtp.cfg`. + +---- +$ sudo osmo-ggsn -c /usr/share/doc/osmo-ggsn/examples/osmo-ggsn-kernel-gtp.cfg +---- + +.Example: APN with kernel-gtp +---- +ggsn ggsn0 + gtp state-dir /tmp + gtp bind-ip 127.0.0.2 + apn internet + gtpu-mode kernel-gtp + tun-device tun4 + type-support v4 + ip prefix dynamic 172.16.222.0/24 + ip dns 0 8.8.8.8 + ip dns 1 8.8.4.4 + ip ifconfig 172.16.222.0/24 + no shutdown +---- |