Patch Set 1:

(1 comment)

https://gerrit.osmocom.org/#/c/4912/1/OsmoGGSN/chapters/running.adoc
File OsmoGGSN/chapters/running.adoc:

Line 26: internet uplink, OsmoGGSN usually requires IP Forwarding and 
Masquerading to be
I don't really like the idea of telling people to outright enable masquerading. 
I think

* we should simply refer to this as a normal Linux router setup with multiple 
interfaces, so of course if you want to forward traffic betewen the tun device 
and e.g. an ethernet device, you need forwarding.

* if you don't allocate routed IP adresses on the tun device / APN to your 
subscribers, then, equally, you will have to enable masquerading.  Just like in 
any other setup where non-routed IP adresses are used, irrespective to GGSN.

Not using masquerading has the significant advantage of being able to test 
inbound connections to your MS/UE, which is not something you can do in most 
public networks/APNs. Let's mention it.


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Gerrit-MessageType: comment
Gerrit-Change-Id: Ie49ca7a45113f49e89ce09017500008cbec757f5
Gerrit-PatchSet: 1
Gerrit-Project: osmo-gsm-manuals
Gerrit-Branch: master
Gerrit-Owner: Neels Hofmeyr <[email protected]>
Gerrit-Reviewer: Harald Welte <[email protected]>
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