tree 92557322eb5aa947552cce4297c0c4bf44de271c
parent d53c6046bc315cd2ddbdeac86d3b574b371985b6
author Neels Hofmeyr <nhofmeyr@sysmocom.de> 1449148364 +0100
committer Neels Hofmeyr <nhofmeyr@sysmocom.de> 1449148483 +0100

gtphub: implement sgsn_use_sender for NAT.

If an SGSN is behind NAT, we cannot rely on the default ports. Specifically,
if a GGSN sends a message, the forwarding to the SGSN should go to whichever
port the SGSN last sent from (whether sequence nr is known or not).

Add sgsn_use_sender config and VTY command, and store the sender instead
of the GSN Address IE and default port if set.

Sponsored-by: On-Waves ehi