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avatli at itu.edu.tr avatli at itu.edu.trHi I'm trying to build a setup by using GTP module and libgtpnl tools on Centos 7 but I haven't been successful yet. Worse, I don't know how to debug the problem. I also stopped firewall and iptables. How can I debug/solve, I will be very glad if you help. dmesg or system messages show show nothing. Why is GTP interface (link) is unreachable. Thanks in advance - Volkan $ modinfo gtp filename: /lib/modules/5.7.7-1.el7.elrepo.x86_64/kernel/drivers/net/gtp.ko alias: net-pf-16-proto-16-family-gtp alias: rtnl-link-gtp description: Interface driver for GTP encapsulated traffic author: Harald Welte <hwelte at sysmocom.de> license: GPL srcversion: 191407DA5399304D93D62C7 depends: udp_tunnel retpoline: Y intree: Y name: gtp vermagic: 5.7.7-1.el7.elrepo.x86_64 SMP mod_unload modversions $ modinfo udp_tunnel filename: /lib/modules/5.7.7-1.el7.elrepo.x86_64/kernel/net/ipv4/udp_tunnel.ko license: GPL srcversion: 0A315BA6124B0664F4D23FB depends: retpoline: Y intree: Y name: udp_tunnel vermagic: 5.7.7-1.el7.elrepo.x86_64 SMP mod_unload modversions $ ip addr add 172.0.0.1/24 dev enp9s0 $ ip addr add 172.99.0.1/32 dev lo $ ./gtp-link add gtp1 WARNING: attaching dummy socket descriptors. Keep this process running for testing purposes. $ ./gtp-tunnel add gtp1 v1 200 100 172.99.0.2 172.0.0.2 $ ip route add 172.99.0.2/32 dev gtp1 $ ./gtp-tunnel list version 1 tei 200/100 ms_addr 172.99.0.2 sgsn_addr 172.0.0.2 $ ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet 172.99.0.1/32 scope global lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 7: enp9s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether 08:35:71:ab:54:5f brd ff:ff:ff:ff:ff:ff inet 172.0.0.1/24 scope global enp9s0 valid_lft forever preferred_lft forever 8: gtp1: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 0 qdisc noqueue state UNKNOWN group default qlen 1000 link/none $ ip route default via 192.168.1.1 dev enp2s0 proto static metric 100 172.0.0.0/24 dev enp9s0 proto kernel scope link src 172.0.0.1 172.99.0.2 dev gtp1 scope link $ ping 172.99.0.2 PING 172.99.0.2 (172.99.0.2) 56(84) bytes of data. ping: sendmsg: Network is unreachable ping: sendmsg: Network is unreachable ping: sendmsg: Network is unreachable