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manual: tweak 'running' for new netinst feature

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Related: SYS#6192
Change-Id: Iaa7af53aae72099283bb29ef0fc0eba03ae2f27d
This commit is contained in:
Neels Janosch Hofmeyr
2022-12-09 06:45:33 +01:00
parent b9d4ac8379
commit 52f9da22ff
1 changed files with 15 additions and 8 deletions
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23
doc/manuals/chapters/running.adoc
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@@ -117,11 +117,12 @@ device. To en/decapsulate GTP, the APN device needs to be assigned an IP address
range that matches the UE IP addresses that are configured in GTP-C / PFCP.
The following configuration placed in `osmo-upf.cfg` creates a GTP device called
`apn23` on startup, which is also destroyed on program exit:
`apn23` on startup of osmo-upf, which is destroyed on program exit. It listens
for GTP on local IP address `1.2.3.4`:
----
tunend
dev create apn23
dev create apn23 1.2.3.4
----
TODO:: `osmo-upf` is not yet able to configure this network device's IP address
@@ -132,7 +133,7 @@ called `apn42`:
----
tunend
dev use apn42
dev use apn42 2.3.4.5
----
GTP kernel devices can be managed manually using the `gtp-link` program
@@ -146,11 +147,17 @@ available from the 'libgtpnl' project:
$ osmo-upf -c osmo-upf.cfg
----
NOTE:: It is possible to configure multiple GTP devices in `osmo-upf.cfg`, but
`osmo-upf` currently _only uses the first GTP device_ found in the
configuration. In the future, different devices may be used based on the Network
Instance IE passed in the PFCP Session messages (PDR/FAR). Until then, it makes
little sense to configure more than one GTP device.
It is possible to configure multiple GTP devices in `osmo-upf.cfg`. Depending on
the Network Instance name, osmo-upf creates tunnel endpoints on the GTP device
with a matching IP address:
- The Network Instance IE in the PDR on the Access side determines the local IP
address to use, see <<netinst>>.
- This local IP address in turn determines the GTP device to use.
It is possible for a GTP device to listen on ANY -- just omit the IP address in
the `dev` config. In this case, all Network Instance names will be served by
this GTP device. When using ANY, there should be exactly one GTP dev configured.
[[nftables]]
===== Configure Linux netfilter for `tunmap`