Hi Jonas, On Fri, Dec 11, 2020 at 01:26:07PM +0100, Jonas Bonn wrote: > From 3GPP TS 29.281: > "...the UDP Source Port or the Flow Label field... should be set dynamically > by the sending GTP-U entity to help balancing the load in the transport > network."
You unfortuantely didn't specifiy which 3GPP release you are referring to. At least in V15.7.0 (2020-01) Release 15 I can only find: "For the messages described below, the UDP Source Port (except as specified for the Echo Response message) may be allocated either statically or dynamically by the sending GTP-U entity. NOTE: Dynamic allocation of the UDP source port can help balancing the load in the network, depending on network deployments and network node implementations." For GTPv0, TS 29.060 states: "The UDP Source Port is a locally allocated port number at the sending GSN/RNC." unfortuantely it doesn't say if it's a locally allocated number globally for that entire GSN/RNC, or it's dynamic per flow or per packet. As I'm aware of a lot of very tight packet filtering between GSNs, I would probably not go for fully dynamic source port allocation without some kind of way how the user (GTP-control instance) being able to decide on that policy. -- - Harald Welte <lafo...@gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)
