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Harald Welte laforge at osmocom.orgHi Avatli, can you please explain what exactly you are trying to do? What is your overall goal? Which software do you want to use as GGSN/P-GW? In case you assume that GTP is symmetric and that you can simply establish GTP tunnels with some command line tunnels between two linux machines: That's not the case. GTP exists to dynamically manage [lots of] per-subscriber tunnels, all of which are represented within one GTP "link" by the kernel GTP module. You always need a userspace application implementing the control plane instance (GTP-C v1 for GGSN, v2 for P-GW). And even with that, it always only implements the GGSN / P-GW side and not the SGSN / S-GW side. -- - Harald Welte <laforge at osmocom.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)