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Open5GS EPC & srsRAN 4G with ZeroMQ UE / RAN Sample Configuration - UPG-VPP(VPP/DPDK UPF(PGW-U))

This describes a simple configuration for working Open5GS EPC and UPG-VPP. In particular, see here for UPG-VPP configuration.

Sample Configurations and Miscellaneous for Mobile Network

Table of Contents

Overview of Open5GS CUPS-enabled EPC Simulation Mobile Network

This describes a simple configuration of C-Plane, UPG-VPP and Data Network Gateway for Open5GS EPC. Note that this configuration is implemented with Proxmox VE VMs.

The following minimum configuration was set as a condition.

  • One SGW-U/UPF(PGW-U) and Data Network Gateway
  • One UE and one APN

The built simulation environment is as follows.

The EPC / VPP/DPDK PGW-U / UE / RAN used are as follows.

Each VMs are as follows.

VM SW & Role IP address OS CPU
(Min)		 Mem
(Min)		 HDD
(Min)
VM1 Open5GS EPC C-Plane 192.168.0.111/24 Ubuntu 24.04 1 2GB 20GB
VM2 Open5GS EPC U-Plane (SGW-U) 192.168.0.112/24 Ubuntu 24.04 1 1GB 20GB
VM-UP UPG-VPP U-Plane (PGW-U) 192.168.0.151/24 Ubuntu 22.04 2 8GB 20GB
VM-DN Data Network Gateway 192.168.0.152/24 Ubuntu 24.04 1 1GB 10GB
VM3 srsRAN 4G ZMQ RAN (eNodeB) 192.168.0.121/24 Ubuntu 22.04 1 2GB 10GB
VM4 srsRAN 4G ZMQ UE 192.168.0.122/24 Ubuntu 22.04 1 2GB 10GB

The network interfaces of each VM are as follows. Note. Do not enable(up) any devices that will be under the control of DPDK. These devices will be enabled and set IP addresses in the init.conf file of UPG-VPP.

VM Device Model Linux Bridge IP address Interface Under DPDK
VM1 ens18 VirtIO vmbr1 10.0.0.111/24 (NAPT NW) --
ens19 VirtIO mgbr0 192.168.0.111/24 (Mgmt NW) --
ens20 VirtIO vmbr4 192.168.14.111/24 Sxb (N4 for 5GC) --
VM2 ens18 VirtIO vmbr1 10.0.0.112/24 (NAPT NW) --
ens19 VirtIO mgbr0 192.168.0.112/24 (Mgmt NW) --
ens20 VirtIO vmbr3 192.168.13.112/24 S1-U,S5u (N3 for 5GC) --
VM-UP ens18 VirtIO vmbr1 10.0.0.151/24 (NAPT NW) down --
ens19 VirtIO mgbr0 192.168.0.151/24 (Mgmt NW) --
ens20 VirtIO vmbr3 192.168.13.151/24 S5u (N3 for 5GC) x
ens21 VirtIO vmbr4 192.168.14.151/24 Sxb (N4 for 5GC) x
ens22 VirtIO vmbr6 192.168.16.151/24 SGi (N6 for 5GC) x
VM-DN ens18 VirtIO vmbr1 10.0.0.152/24 (NAPT NW) --
ens19 VirtIO mgbr0 192.168.0.152/24 (Mgmt NW) --
ens20 VirtIO vmbr6 192.168.16.152/24 SGi (N6 for 5GC) --
VM3 ens18 VirtIO vmbr1 10.0.0.121/24 (NAPT NW) --
ens19 VirtIO mgbr0 192.168.0.121/24 (Mgmt NW) --
ens20 VirtIO vmbr3 192.168.13.121/24 S1-U (N3 for 5GC) --
VM4 ens18 VirtIO vmbr1 10.0.0.122/24 (NAPT NW) --
ens19 VirtIO mgbr0 192.168.0.122/24 (Mgmt NW) --

Linux Bridges of Proxmox VE are as follows.

Linux Bridge Network CIDR Interface
vmbr1 10.0.0.0/24 NAPT NW
mgbr0 192.168.0.0/24 Mgmt NW
vmbr3 192.168.13.0/24 S1-U,S5u for EPC
vmbr4 192.168.14.0/24 Sxb for EPC
vmbr6 192.168.16.0/24 SGi for EPC

Set network instance to internet.

Network Instance
internet

Subscriber Information (other information is the same) is as follows.

UE IMSI APN OP/OPc
UE 001010000000100 internet OPc

I registered these information with the Open5GS WebUI. In addition, 3GPP TS 35.208 "4.3 Test Sets" is published by 3GPP as test data for the 3GPP authentication and key generation functions (MILENAGE).

The PDN is as follows.

PDN APN TUNnel interface of UE
10.45.0.0/16 internet tun_srsue

The main information of eNodeB is as follows.

MCC MNC TAC eNodeB ID Cell ID E-UTRAN Cell ID
001 01 1 0x19b 0x01 0x19b01

Changes in configuration files of Open5GS EPC, UPG-VPP and srsRAN 4G ZMQ UE / RAN

Please refer to the following for building Open5GS, UPG-VPP and srsRAN 4G ZMQ respectively.

Changes in configuration files of Open5GS EPC C-Plane

The following parameters can be used in the logic that selects SGW-U and UPF(PGW-U) as the connection destination by PFCP.

  • APN
  • TAC (Tracking Area Code)
  • e_CellID

For the sake of simplicity, I used only APN this time.

  • open5gs/install/etc/open5gs/mme.yaml
--- mme.yaml.orig       2025-04-27 11:38:05.000000000 +0900
+++ mme.yaml    2025-05-04 08:17:19.608382075 +0900
@@ -12,7 +12,7 @@
   freeDiameter: /root/open5gs/install/etc/freeDiameter/mme.conf
   s1ap:
     server:
-      - address: 127.0.0.2
+      - address: 192.168.0.111
   gtpc:
     server:
       - address: 127.0.0.2
@@ -27,14 +27,14 @@
         port: 9090
   gummei:
     - plmn_id:
-        mcc: 999
-        mnc: 70
+        mcc: 001
+        mnc: 01
       mme_gid: 2
       mme_code: 1
   tai:
     - plmn_id:
-        mcc: 999
-        mnc: 70
+        mcc: 001
+        mnc: 01
       tac: 1
   security:
     integrity_order : [ EIA2, EIA1, EIA0 ]
  • open5gs/install/etc/open5gs/sgwc.yaml
--- sgwc.yaml.orig      2024-05-02 19:52:00.000000000 +0900
+++ sgwc.yaml   2025-05-04 08:26:48.859933645 +0900
@@ -14,10 +14,11 @@
       - address: 127.0.0.3
   pfcp:
     server:
-      - address: 127.0.0.3
+      - address: 192.168.0.111
     client:
       sgwu:
-        - address: 127.0.0.6
+        - address: 192.168.0.112
+          apn: internet
 
 ################################################################################
 # GTP-C Server
  • open5gs/install/etc/open5gs/smf.yaml
--- smf.yaml.orig       2025-04-27 11:38:05.000000000 +0900
+++ smf.yaml    2025-05-04 10:05:14.916099877 +0900
@@ -7,29 +7,23 @@
   max:
     ue: 1024  # The number of UE can be increased depending on memory size.
 #    peer: 64
+  parameter:
+    use_upg_vpp: true
 
 smf:
-  sbi:
-    server:
-      - address: 127.0.0.4
-        port: 7777
-    client:
-#      nrf:
-#        - uri: http://127.0.0.10:7777
-      scp:
-        - uri: http://127.0.0.200:7777
   pfcp:
     server:
-      - address: 127.0.0.4
+      - address: 192.168.14.111
     client:
       upf:
-        - address: 127.0.0.7
+        - address: 192.168.14.151
+          dnn: internet
   gtpc:
     server:
       - address: 127.0.0.4
   gtpu:
     server:
-      - address: 127.0.0.4
+      - address: 192.168.14.111
   metrics:
     server:
       - address: 127.0.0.4
@@ -37,13 +31,10 @@
   session:
     - subnet: 10.45.0.0/16
       gateway: 10.45.0.1
-    - subnet: 2001:db8:cafe::/48
-      gateway: 2001:db8:cafe::1
+      dnn: internet
   dns:
     - 8.8.8.8
     - 8.8.4.4
-    - 2001:4860:4860::8888
-    - 2001:4860:4860::8844
   mtu: 1400
 #  p-cscf:
 #    - 127.0.0.1

Changes in configuration files of Open5GS EPC U-Plane

  • open5gs/install/etc/open5gs/sgwu.yaml
--- sgwu.yaml.orig      2024-05-02 19:52:00.000000000 +0900
+++ sgwu.yaml   2024-10-27 09:32:03.556465579 +0900
@@ -11,13 +11,13 @@
 sgwu:
   pfcp:
     server:
-      - address: 127.0.0.6
+      - address: 192.168.0.112
     client:
 #      sgwc:    # SGW-U PFCP Client try to associate SGW-C PFCP Server
 #        - address: 127.0.0.3
   gtpu:
     server:
-      - address: 127.0.0.6
+      - address: 192.168.13.112
 
 ################################################################################
 # PFCP Server

Changes in configuration files of UPG-VPP

See here for the original files.

  • upg-vpp/startup.conf
    There is no change.

  • upg-vpp/init.conf
    There is no change.

Changes in configuration files of srsRAN 4G ZMQ UE / RAN

Changes in configuration files of RAN

  • srsRAN_4G/build/srsenb/enb.conf
--- enb.conf.example    2024-02-03 23:26:02.000000000 +0900
+++ enb.conf    2024-03-10 17:00:27.383907337 +0900
@@ -22,9 +22,9 @@
 enb_id = 0x19B
 mcc = 001
 mnc = 01
-mme_addr = 127.0.1.100
-gtp_bind_addr = 127.0.1.1
-s1c_bind_addr = 127.0.1.1
+mme_addr = 192.168.0.111
+gtp_bind_addr = 192.168.13.121
+s1c_bind_addr = 192.168.0.121
 s1c_bind_port = 0
 n_prb = 50
 #tm = 4
@@ -80,8 +80,8 @@
 #time_adv_nsamples = auto
 
 # Example for ZMQ-based operation with TCP transport for I/Q samples
-#device_name = zmq
-#device_args = fail_on_disconnect=true,tx_port=tcp://*:2000,rx_port=tcp://localhost:2001,id=enb,base_srate=23.04e6
+device_name = zmq
+device_args = fail_on_disconnect=true,tx_port=tcp://192.168.0.121:2000,rx_port=tcp://192.168.0.122:2001,id=enb,base_srate=23.04e6
 
 #####################################################################
 # Packet capture configuration
  • srsRAN_4G/build/srsenb/rr.conf
--- rr.conf.example     2024-02-03 23:26:02.000000000 +0900
+++ rr.conf     2023-05-02 11:52:54.000000000 +0900
@@ -55,7 +55,7 @@
   {
     // rf_port = 0;
     cell_id = 0x01;
-    tac = 0x0007;
+    tac = 0x0001;
     pci = 1;
     // root_seq_idx = 204;
     dl_earfcn = 3350;

Changes in configuration files of UE

  • srsRAN_4G/build/srsue/ue.conf
--- ue.conf.example     2024-02-03 23:26:02.000000000 +0900
+++ ue.conf     2023-05-02 12:01:28.000000000 +0900
@@ -42,8 +42,8 @@
 #continuous_tx     = auto
 
 # Example for ZMQ-based operation with TCP transport for I/Q samples
-#device_name = zmq
-#device_args = tx_port=tcp://*:2001,rx_port=tcp://localhost:2000,id=ue,base_srate=23.04e6
+device_name = zmq
+device_args = tx_port=tcp://192.168.0.122:2001,rx_port=tcp://192.168.0.121:2000,id=ue,base_srate=23.04e6
 
 #####################################################################
 # EUTRA RAT configuration
@@ -139,9 +139,9 @@
 [usim]
 mode = soft
 algo = milenage
-opc  = 63BFA50EE6523365FF14C1F45F88737D
-k    = 00112233445566778899aabbccddeeff
-imsi = 001010123456780
+opc  = E8ED289DEBA952E4283B54E88E6183CA
+k    = 465B5CE8B199B49FAA5F0A2EE238A6BC
+imsi = 001010000000100
 imei = 353490069873319
 #reader =
 #pin  = 1234
@@ -180,8 +180,8 @@
 #                      Supported: 0 - NULL, 1 - Snow3G, 2 - AES, 3 - ZUC
 #####################################################################
 [nas]
-#apn = internetinternet
-#apn_protocol = ipv4
+apn = internet
+apn_protocol = ipv4
 #user = srsuser
 #pass = srspass
 #force_imsi_attach = false

Network settings of Open5GS EPC, UPG-VPP and srsRAN 4G ZMQ UE / RAN

Network settings of UPG-VPP and Data Network Gateway

See this1 and this2.

Build Open5GS, UPG-VPP and srsRAN 4G ZMQ UE / RAN

Please refer to the following for building Open5GS, UPG-VPP and srsRAN 4G ZMQ UE / RAN respectively.

Install MongoDB on Open5GS EPC C-Plane machine. MongoDB Compass is a convenient tool to look at the MongoDB database.

Run Open5GS EPC, UPG-VPP and srsRAN 4G ZMQ UE / RAN

First run UPG-VPP and EPC U-Plane(SGW-U), then EPC C-Plane, the RAN, and the UE.

Run UPG-VPP

See this.

Run Open5GS EPC U-Plane

./install/bin/open5gs-sgwud &

Run Open5GS EPC C-Plane

./install/bin/open5gs-hssd &
./install/bin/open5gs-pcrfd &
sleep 1
./install/bin/open5gs-mmed &
./install/bin/open5gs-sgwcd &
./install/bin/open5gs-smfd &

The status of PFCP association between UPG-VPP and Open5GS SMF(PGW-C) is as follows.

vpp# show upf association 
Node: 192.168.14.111
  Recovery Time Stamp: 2025/05/04 12:31:01:000
  Sessions: 0
vpp#

Run srsRAN 4G ZMQ RAN

Run srsRAN 4G ZMQ RAN and connect to Open5GS EPC.

# cd srsRAN_4G/build/srsenb
# ./src/srsenb enb.conf
---  Software Radio Systems LTE eNodeB  ---

Reading configuration file enb.conf...

Built in Release mode using commit ec29b0c1f on branch master.

Opening 1 channels in RF device=zmq with args=fail_on_disconnect=true,tx_port=tcp://192.168.0.121:2000,rx_port=tcp://192.168.0.122:2001,id=enb,base_srate=23.04e6
Supported RF device list: zmq file
CHx base_srate=23.04e6
CHx id=enb
Current sample rate is 1.92 MHz with a base rate of 23.04 MHz (x12 decimation)
CH0 rx_port=tcp://192.168.0.122:2001
CH0 tx_port=tcp://192.168.0.121:2000
CH0 fail_on_disconnect=true
Current sample rate is 11.52 MHz with a base rate of 23.04 MHz (x2 decimation)
Current sample rate is 11.52 MHz with a base rate of 23.04 MHz (x2 decimation)
Setting frequency: DL=2680.0 Mhz, UL=2560.0 MHz for cc_idx=0 nof_prb=50

==== eNodeB started ===
Type <t> to view trace

The Open5GS C-Plane log when executed is as follows.

05/04 12:31:38.660: [mme] INFO: eNB-S1 accepted[192.168.0.121]:56695 in s1_path module (../src/mme/s1ap-sctp.c:114)
05/04 12:31:38.660: [mme] INFO: eNB-S1 accepted[192.168.0.121] in master_sm module (../src/mme/mme-sm.c:108)
05/04 12:31:38.660: [mme] INFO: [Added] Number of eNBs is now 1 (../src/mme/mme-context.c:3031)
05/04 12:31:38.661: [mme] INFO: eNB-S1[192.168.0.121] max_num_of_ostreams : 30 (../src/mme/mme-sm.c:157)

Run srsRAN 4G ZMQ UE

Run srsRAN 4G ZMQ UE and connect to Open5GS EPC.

# cd srsRAN_4G/build/srsue
# ./src/srsue ue.conf
Reading configuration file ue.conf...

Built in Release mode using commit ec29b0c1f on branch master.

Opening 1 channels in RF device=zmq with args=tx_port=tcp://192.168.0.122:2001,rx_port=tcp://192.168.0.121:2000,id=ue,base_srate=23.04e6
Supported RF device list: zmq file
CHx base_srate=23.04e6
CHx id=ue
Current sample rate is 1.92 MHz with a base rate of 23.04 MHz (x12 decimation)
CH0 rx_port=tcp://192.168.0.121:2000
CH0 tx_port=tcp://192.168.0.122:2001
Waiting PHY to initialize ... done!
Attaching UE...
Current sample rate is 1.92 MHz with a base rate of 23.04 MHz (x12 decimation)
Current sample rate is 1.92 MHz with a base rate of 23.04 MHz (x12 decimation)
.
Found Cell:  Mode=FDD, PCI=1, PRB=50, Ports=1, CP=Normal, CFO=-0.2 KHz
Current sample rate is 11.52 MHz with a base rate of 23.04 MHz (x2 decimation)
Current sample rate is 11.52 MHz with a base rate of 23.04 MHz (x2 decimation)
Found PLMN:  Id=00101, TAC=1
Random Access Transmission: seq=9, tti=181, ra-rnti=0x2
RRC Connected
Random Access Complete.     c-rnti=0x46, ta=0
Network attach successful. IP: 10.45.0.2
 nTp) ((t) 4/5/2025 3:32:17 TZ:99

The Open5GS C-Plane log when executed is as follows.

05/04 12:32:17.529: [mme] INFO: InitialUEMessage (../src/mme/s1ap-handler.c:431)
05/04 12:32:17.529: [mme] INFO: [Added] Number of eNB-UEs is now 1 (../src/mme/mme-context.c:5148)
05/04 12:32:17.529: [mme] INFO: Unknown UE by S_TMSI[G:2,C:1,M_TMSI:0xc00006c1] (../src/mme/s1ap-handler.c:510)
05/04 12:32:17.529: [mme] INFO:     ENB_UE_S1AP_ID[1] MME_UE_S1AP_ID[1] TAC[1] CellID[0x19b01] (../src/mme/s1ap-handler.c:607)
05/04 12:32:17.529: [mme] INFO: Unknown UE by GUTI[G:2,C:1,M_TMSI:0xc00006c1] (../src/mme/mme-context.c:3840)
05/04 12:32:17.529: [mme] INFO: [Added] Number of MME-UEs is now 1 (../src/mme/mme-context.c:3631)
05/04 12:32:17.529: [emm] INFO: [] Attach request (../src/mme/emm-sm.c:474)
05/04 12:32:17.529: [emm] INFO:     GUTI[G:2,C:1,M_TMSI:0xc00006c1] IMSI[Unknown IMSI] (../src/mme/emm-handler.c:246)
05/04 12:32:17.550: [emm] INFO: Identity response (../src/mme/emm-sm.c:444)
05/04 12:32:17.550: [emm] INFO:     IMSI[001010000000100] (../src/mme/emm-handler.c:482)
05/04 12:32:17.617: [mme] INFO: [Added] Number of MME-Sessions is now 1 (../src/mme/mme-context.c:5162)
05/04 12:32:17.657: [sgwc] INFO: [Added] Number of SGWC-UEs is now 1 (../src/sgwc/context.c:239)
05/04 12:32:17.657: [sgwc] INFO: [Added] Number of SGWC-Sessions is now 1 (../src/sgwc/context.c:924)
05/04 12:32:17.657: [sgwc] INFO: UE IMSI[001010000000100] APN[internet] (../src/sgwc/s11-handler.c:268)
05/04 12:32:17.658: [gtp] INFO: gtp_connect() [127.0.0.4]:2123 (../lib/gtp/path.c:60)
05/04 12:32:17.658: [smf] INFO: [Added] Number of SMF-UEs is now 1 (../src/smf/context.c:1033)
05/04 12:32:17.658: [smf] INFO: [Added] Number of SMF-Sessions is now 1 (../src/smf/context.c:3190)
05/04 12:32:17.658: [smf] INFO: UE IMSI[001010000000100] APN[internet] IPv4[10.45.0.2] IPv6[] (../src/smf/s5c-handler.c:303)
05/04 12:32:17.665: [gtp] INFO: gtp_connect() [192.168.13.151]:2152 (../lib/gtp/path.c:60)
05/04 12:32:17.922: [emm] INFO: [001010000000100] Attach complete (../src/mme/emm-sm.c:1548)
05/04 12:32:17.922: [emm] INFO:     IMSI[001010000000100] (../src/mme/emm-handler.c:286)
05/04 12:32:17.922: [emm] INFO:     UTC [2025-05-04T03:32:17] Timezone[0]/DST[0] (../src/mme/emm-handler.c:292)
05/04 12:32:17.922: [emm] INFO:     LOCAL [2025-05-04T12:32:17] Timezone[32400]/DST[0] (../src/mme/emm-handler.c:296)

The Open5GS U-Plane log when executed is as follows.

05/04 12:32:17.681: [sgwu] INFO: UE F-SEID[UP:0x170 CP:0xe8e] (../src/sgwu/context.c:170)
05/04 12:32:17.681: [sgwu] INFO: [Added] Number of SGWU-Sessions is now 1 (../src/sgwu/context.c:175)
05/04 12:32:17.689: [gtp] INFO: gtp_connect() [192.168.13.151]:2152 (../lib/gtp/path.c:60)
05/04 12:32:17.946: [gtp] INFO: gtp_connect() [192.168.13.121]:2152 (../lib/gtp/path.c:60)

The PDU session establishment status of UPG-VPP is as follows.

vpp# show upf session 
CP F-SEID: 0x0000000000000055 (85) @ 192.168.14.111
UP F-SEID: 0x0000000000000055 (85) @ 192.168.14.151 (192.168.14.111 ::)
User ID: IMEI:3534900698733153
  PFCP Association: 0
  TEID assignment per choose ID
PDR: 1 @ 0x7fe44053b658
  Precedence: 65535
  PDI:
    Fields: 0000000c
    Source Interface: Core
    Network Instance: internet
    UE IP address (destination):
      IPv4 address: 10.45.0.2
    SDF Filter [1]:
      permit out ip from any to assigned 
  Outer Header Removal: no
  FAR Id: 1
  URR Ids: [] @ 0x0
  QER Ids: [1] @ 0x7fe440540128
PDR: 2 @ 0x7fe44053b6d8
  Precedence: 65535
  PDI:
    Fields: 0000000d
    Source Interface: Access
    Network Instance: internet
    Local F-TEID: 622494450 (0x251a82f2)
            IPv4: 192.168.13.151
    UE IP address (source):
      IPv4 address: 10.45.0.2
    SDF Filter [1]:
      permit out ip from any to assigned 
  Outer Header Removal: GTP-U/UDP/IPv4
  FAR Id: 2
  URR Ids: [] @ 0x0
  QER Ids: [1] @ 0x7fe496550398
PDR: 3 @ 0x7fe44053b758
  Precedence: 255
  PDI:
    Fields: 00000001
    Source Interface: CP-function
    Network Instance: internet
    Local F-TEID: 949355945 (0x389605a9)
            IPv4: 192.168.13.151
  Outer Header Removal: GTP-U/UDP/IPv4
  FAR Id: 1
  URR Ids: [] @ 0x0
  QER Ids: [] @ 0x0
PDR: 4 @ 0x7fe44053b7d8
  Precedence: 255
  PDI:
    Fields: 00000009
    Source Interface: Access
    Network Instance: internet
    Local F-TEID: 622494450 (0x251a82f2)
            IPv4: 192.168.13.151
    SDF Filter [1]:
      permit out 58 from ff02::2 to assigned 
  Outer Header Removal: GTP-U/UDP/IPv4
  FAR Id: 3
  URR Ids: [] @ 0x0
  QER Ids: [] @ 0x0
FAR: 1
  Apply Action: 00000002 == [FORWARD]
  Forward:
    Network Instance: internet
    Destination Interface: 0
    Outer Header Creation: [GTP-U/UDP/IPv4],TEID:000095e4,IP:192.168.13.112
FAR: 2
  Apply Action: 00000002 == [FORWARD]
  Forward:
    Network Instance: internet
    Destination Interface: 1
FAR: 3
  Apply Action: 00000002 == [FORWARD]
  Forward:
    Network Instance: internet
    Destination Interface: 3
    Outer Header Creation: [GTP-U/UDP/IPv4],TEID:00000001,IP:192.168.14.111
vpp#

The result of ip addr show on VM4 (UE) is as follows.

6: tun_srsue: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 500
    link/none 
    inet 10.45.0.2/24 scope global tun_srsue
       valid_lft forever preferred_lft forever

Ping google.com

Specify the UE's TUNnel interface and try ping.

Case for going through PDN 10.45.0.0/16

Run tcpdump on VM-DN and check that the packet goes through N6 (ens20).

  • ping google.com on VM4 (UE)
# ping google.com -I tun_srsue -n
PING google.com (172.217.174.110) from 10.45.0.2 tun_srsue: 56(84) bytes of data.
64 bytes from 172.217.174.110: icmp_seq=1 ttl=110 time=40.2 ms
64 bytes from 172.217.174.110: icmp_seq=2 ttl=110 time=42.7 ms
64 bytes from 172.217.174.110: icmp_seq=3 ttl=110 time=43.7 ms
  • Run tcpdump on VM-DN
# tcpdump -i ens20 -n
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on ens20, link-type EN10MB (Ethernet), snapshot length 262144 bytes
12:34:55.268854 IP 10.45.0.2 > 172.217.174.110: ICMP echo request, id 2, seq 1, length 64
12:34:55.284465 IP 172.217.174.110 > 10.45.0.2: ICMP echo reply, id 2, seq 1, length 64
12:34:56.273340 IP 10.45.0.2 > 172.217.174.110: ICMP echo request, id 2, seq 2, length 64
12:34:56.288515 IP 172.217.174.110 > 10.45.0.2: ICMP echo reply, id 2, seq 2, length 64
12:34:57.275953 IP 10.45.0.2 > 172.217.174.110: ICMP echo request, id 2, seq 3, length 64
12:34:57.291252 IP 172.217.174.110 > 10.45.0.2: ICMP echo reply, id 2, seq 3, length 64

In addition to ping, you may try to access the web by specifying the TUNnel interface with curl as follows.

  • curl google.com on VM4 (UE)
# curl --interface tun_srsue google.com
<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
<TITLE>301 Moved</TITLE></HEAD><BODY>
<H1>301 Moved</H1>
The document has moved
<A HREF="http://www.google.com/">here</A>.
</BODY></HTML>
  • Run tcpdump on VM-DN
12:38:19.872418 IP 10.45.0.2.60984 > 172.217.174.110.80: Flags [S], seq 1787652631, win 64240, options [mss 1460,sackOK,TS val 269799255 ecr 0,nop,wscale 7], length 0
12:38:19.889287 IP 172.217.174.110.80 > 10.45.0.2.60984: Flags [S.], seq 3357340548, ack 1787652632, win 65535, options [mss 1412,sackOK,TS val 1711326121 ecr 269799255,nop,wscale 8], length 0
12:38:19.915976 IP 10.45.0.2.60984 > 172.217.174.110.80: Flags [.], ack 1, win 502, options [nop,nop,TS val 269799297 ecr 1711326121], length 0
12:38:19.915976 IP 10.45.0.2.60984 > 172.217.174.110.80: Flags [P.], seq 1:75, ack 1, win 502, options [nop,nop,TS val 269799297 ecr 1711326121], length 74: HTTP: GET / HTTP/1.1
12:38:19.934781 IP 172.217.174.110.80 > 10.45.0.2.60984: Flags [.], ack 75, win 1050, options [nop,nop,TS val 1711326167 ecr 269799297], length 0
12:38:19.977455 IP 172.217.174.110.80 > 10.45.0.2.60984: Flags [P.], seq 1:774, ack 75, win 1050, options [nop,nop,TS val 1711326209 ecr 269799297], length 773: HTTP: HTTP/1.1 301 Moved Permanently
12:38:20.004802 IP 10.45.0.2.60984 > 172.217.174.110.80: Flags [.], ack 774, win 501, options [nop,nop,TS val 269799385 ecr 1711326209], length 0
12:38:20.004802 IP 10.45.0.2.60984 > 172.217.174.110.80: Flags [F.], seq 75, ack 774, win 501, options [nop,nop,TS val 269799385 ecr 1711326209], length 0
12:38:20.021835 IP 172.217.174.110.80 > 10.45.0.2.60984: Flags [F.], seq 774, ack 76, win 1050, options [nop,nop,TS val 1711326253 ecr 269799385], length 0
12:38:20.047688 IP 10.45.0.2.60984 > 172.217.174.110.80: Flags [.], ack 775, win 501, options [nop,nop,TS val 269799428 ecr 1711326253], length 0

Also, when trying iperf3 client on VM4 (UE), first change the default GW interface to tun_srsue. Below is an example of my environment (VM4).

# ip link set dev ens18 down
# ip route add default dev tun_srsue

Next, to avoid IP fragmentation, set as follows according to the instructions in here [7].

# ip link set tun_srsue mtu 1464

Then, bind the assigned IP address 10.45.0.2 and run iperf3 client. The following is an example of connecting to iperf3 server running on VM-DN 192.168.16.152.

# iperf3 -B 10.45.0.2 -c 192.168.16.152

You could now connect to the PDN and send any packets on the network using UPG-VPP.

Now you could work Open5GS EPC with UPG-VPP. I would like to thank the excellent developers and all the contributors of Open5GS, UPG-VPP, VPP, DPDK and srsRAN 4G.

Changelog (summary)

  • [2025.05.04] Updated to UPG-VPP v1.13.0 and Open5GS v2.7.5 (2025.04.25). Changed the VM environment from Virtualbox to Proxmox VE.
  • [2024.03.24] Updated to UPG-VPP v1.12.0.
  • [2023.11.10] Changed from oai-cn5g-upf-vpp to its base travelping/upg-vpp.
  • [2023.07.23] Initial release.

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Open5GS EPC & srsRAN 4G with ZeroMQ UE / RAN Sample Configuration - UPG-VPP(VPP/DPDK UPF(PGW-U))

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dpdk zeromq lte cups vpp epc upf open5gs srsran upg-vpp

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