Re: GTP tunnel seems to exist, but No encapsulation when using libgtpnl

Hi, On Thu, Aug 20, 2020 at 07:05:58PM +0300, Papa Tana wrote: libgtpnl does not manage your UDP socket at all. It manages a netlink socket to the kernel, which is used to create + delete objects in kernel space. You manage all your UDP sockets. I'm not sure where this misconception is coming from. It would be great if you could share your GGSN code base with the community, like we share the kernel GTP-U and all of Osmocom with you. As can be seen in gtp1u_udp_encap_recv(), ther eare multiple situations where GTP-U packets are passed to the socket and not handled in the kernel: * any GTP-U version != 1 * any GTP message types != GTP_TPDU * any GTP messages for which the kernel doesn't know the TID * any GTP messages whose inner IPv4 destination address doesn't match the TID All of those messsages must be implemented in your userspace program, using the very socket your application has created. Regards, Harald -- - Harald Welte <laforge(a)osmocom.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)