GtpTunnelDelFar fail

[asdf7410]

My system information:
OS: ubuntu-20.04.2-live-server-amd64
Linux kernel:5.4.0-66-generic
Gcc version : 9.3.0
free5gc tag v3.0.5
gtp5g tag v0.3.1

When I follow the installation video steps, I enter the command "./test.sh TestRegistration " which trigger some error about GtpTunnelDel Far fail.

I can’t figure out what cause this problem.

The following is my error messages. I appreciate anyone reply.

[muthuramanecs03g]

Looks, the gtp5g kernel module not loaded in your setup.

You can troubleshoot by

1. lsmod | grep gtp5g
   1.a) If the module loaded then get the “dmesg” log and then provide to me

2. If gtp5g kernel module not loaded then follow up the repository GitHub - PrinzOwO/gtp5g: Linux kernel module 5G GTP-U

[demux]

Hello! I have the exact same issue. The gtp5g module is loaded in my setup.Here is my dmesg log:
dmesg.txt (44.4 KB)

Any suggestions what could be wrong?

Thanks in advance!

[muthuramanecs03g]

Hi,

In your case, I need your PFCP Wireshark trace because of the following reason,

[ 3788.728646] upfgtp:[gtp5g] gtp5g_newlink: registered new 5G GTP interface
[ 3796.628327] upfgtp:[gtp5g] gtp5g_gnl_add_far: FAR-Add: id[2] success
[ 3796.628572] upfgtp:[gtp5g] gtp5g_gnl_add_far: FAR-Add: id[4] success
[ 3796.629881] upfgtp:[gtp5g] gtp5g_gnl_add_pdr: PDR-Add: id[1] success
[ 3796.630328] upfgtp:[gtp5g] gtp5g_gnl_add_pdr: PDR-Add: id[3] success
[ 3796.638270] upfgtp:[gtp5g] gtp5g_gnl_add_far: FAR-Add: update id[4] success
[ 3808.740947] upfgtp:[gtp5g] gtp5g_gnl_add_qer: QER-Add: QER_ID(3) success
[ 3808.741065] upfgtp:[gtp5g] gtp5g_gnl_add_qer: QER-Add: QER_ID(1) success
[ 3808.741160] [gtp5g] gtp5g_genl_del_pdr: PDR-Del: failed to find id(0x4)
[ 3808.741772] [gtp5g] gtp5g_genl_del_pdr: PDR-Del: failed to find id(0x2)

From the log,

1. 2 PDRs, it’s id 1 and 3, but trying to delete id 4 and 2 which is not a valid one.
2. 2 FARs, its id 2 and 4
3. 2 QER, its id 3 and 1, UPF didn’t support 2QERs

I like to analyze PFCP trace because I want to make sure what PFCP message send by SMF.

[demux]

Hello, thanks for responding!
pfcp.pcapng (1.3 KB) is this ok?

[muthuramanecs03g]

Demux,

The Downlink Outer Header Creation information in PFCP Session Modification is not right.

The gNB address(N3) should not be as SMF address(N4), and you have to make sure the configuration.

Uplink PDR’s PDI information is right,

But, Downlink information for FAR is not right one,

[demux]

Hello muthuramanecs03g,
I made a clean installation and everything worked fine eventually.
Thanks for your time!