8 May
2023
8 May
'23
2:16 p.m.
Dear Osmocom Community,
I have noticed that the wiki page for OpenBSC GPRS at
https://osmocom.org/projects/cellular-infrastructure/wiki/OpenBSC_GPRS has
not been updated for four years, and since then, there have been
significant updates to the software. As a result, the information on the
GPRS/EDGE Setup page may be outdated, and I am struggling to configure GPRS
on my system.
I have attached my configuration files below for your review.
ip address
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
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp0s31f6: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel
state DOWN group default qlen 1000
link/ether ec:8e:b5:41:cb:90 brd ff:ff:ff:ff:ff:ff
3: wlp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
UP group default qlen 1000
link/ether b8:8a:60:4f:59:02 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.109/24 brd 192.168.1.255 scope global dynamic
noprefixroute wlp1s0
valid_lft 7152sec preferred_lft 7152sec
inet6 fe80::649b:2ab5:6dd3:8779/64 scope link noprefixroute
valid_lft forever preferred_lft forever
20 May
20 May
12:42 p.m.
Hi Ahnaf,
the structure of osmocom have changed since the manual has been written.
The manual is written for the long outdated osmo-nitb (a combined BSC,MSC).
I have noticed that the wiki page for OpenBSC GPRS at
https://osmocom.org/projects/cellular-infrastructure/wiki/OpenBSC_GPRS has
not been updated for four years, and since then, there have been
significant updates to the software. As a result, the information on the
GPRS/EDGE Setup page may be outdated, and I am struggling to configure GPRS
on my system.
I have attached my configuration files below for your review.
I would recommend to take a look into the
https://osmocom.org/projects/cellular-infrastructure/wiki/Osmocom_Network_I…
But you already have configuration files for bsc, msc, sgsn, ggsn.
I would also recommend you to add an IP for every core network component and ran.
Because it helps debugging to have the IPs seperate.
For a local network (everything runs on the same host) I would do:
* 127.0.0.10 bts + pcu
* 127.0.0.11 bsc + bsc-mgw (yes running mgw twice)j
* 127.0.0.12 msc + osmo-sip-connector + msc-mgw
* 127.0.0.13 sgsn
* 127.0.0.14 ggsn
* 127.0.0.15 sip-server (e.g. asterix, ...)
* 127.0.0.16 hlr
You will need to change vty and ctrl interface ips as well.
Back to your current network.
Are you running osmo-stp? osmo-stp is required for the new network.
Ok. but what is not working? Please add more information!
- Can your MS/UE connect to the network?
- CS: location update works?
- PS: routing area update works?
- Does your phones gets an IP? (PDP Context)
- Does `tcpdump -i tun4 -vn` shows any traffic?
Do you have a pcap trace? (Best to upload it to a website and only send the link on this
mailinglist)
Your tun.network file looks wrong. The device should be named tun4 and the IP range is
also wrong.
Personally I wouldn't use systemd-networkd for this.
At least I would expect routing issues. Also I wonder why there isn't a tun4 device.
Even if there is a tun4 device, you might missing the routing and depending on your setup,
NAT/masquerading.
I think you would need to run `ip route add 172.16.222.0/24 dev tun4`
and `iptables -t nat -A POSTROUTING -j MASQUERADE -s 172.16.222.0/24 -o wlp1s0`
Best,
lynxis
10:37 p.m.
Hi Lynxis,
Thank you for your response and suggestions. Regarding my current network
setup, I am using a b200 device to connect my Android phone to the osmobts
network. I am able to establish roaming connections successfully, and I can
make and receive calls as well as send and receive SMS.
However, I am encountering an issue with the network connection for data
services. I am not able to connect to the E (EDGE) or G (GPRS) networks.
Despite being in a coverage area, my phone does not receive an IP address
for data services. It seems that the GPRS/EDGE setup is not functioning
properly.
I have checked the configuration files and made the necessary adjustments
based on your recommendations. I have also reviewed the tun.network file
and corrected the device name to "tun4". However, I am still experiencing
difficulties.
To provide more information, here are some specific questions:
Can my mobile phone successfully connect to the network for voice calls and
SMS?
Yes, I can make and receive voice calls and send/receive SMS without any
issues.
Is the Circuit-Switched (CS) functionality, such as location update,
working properly?
Yes, the CS functionality, including location update, is working as
expected.
Is the Packet-Switched (PS) functionality, such as routing area update,
working properly?
No, the PS functionality, including routing area update, is not working. I
am unable to establish a network connection for data services.
Is my phone receiving an IP address for data services (PDP Context)?
No, my phone is not receiving an IP address for data services.
Have I checked for network traffic using tcpdump -i tun4 -vn?
Yes, I have checked for network traffic using the mentioned command, and I
have got this:
tcpdump: listening on tun4, link-type EN10MB (Ethernet), snapshot length
262144 bytes
Unfortunately, I do not have a pcap trace available at the moment. If
necessary, I can provide additional information or logs to assist with
troubleshooting.
Thank you for your continued support.
Log:
- osmo-hlr
<https://docs.google.com/document/d/1TIj80mQmVUCgFyDyW58E0GdT2ebzkRmlwXuM1xCilZQ/edit?usp=sharing>
- osmo-msc
<https://docs.google.com/document/d/1sByzVEQ-sk7InhWPyaI3LIo5Ws7UuL_99gds1ZDLBCM/edit?usp=sharing>
- osmo-bsc
<https://docs.google.com/document/d/1mFRtjnOfecCFZSmAaA22GA_EM28rB59dIjftM_UXmPc/edit?usp=sharing>
- osmo-sgsn
<https://docs.google.com/document/d/1r3VfTNPlb-9XWU8FWfALh5kRr9502WgrSMuYXkqHrE0/edit?usp=sharing>
- osmo-ggsn
<https://docs.google.com/document/d/13aAEeM22w5gutpmSRmLoIGq1eE8COJF4rrQ4-NF49zY/edit?usp=sharing>
- osmo-pcu
<https://docs.google.com/document/d/1YZXZqG4vefV5kSviKLbgopmUBCTSSPzzKBxeJt28vLY/edit?usp=sharing>
- osmo-stp
<https://docs.google.com/document/d/1ePZ-CAlqjxs1mv4BYaNsUIBxeW3UWDZKqB-edpYu_oU/edit?usp=sharing>
- osmo-bts-trx
<https://docs.google.com/document/d/1jWDZvGJzqCPiGEiHw2Itu80bM3LePrsaVQ5koPkfGN8/edit?usp=sharing>
- osmo-trx-uhd
<https://docs.google.com/document/d/1vliUJ6nzt3f9o4VGlyY3ZvqNDyj-go96ZM3hDqtBw3w/edit?usp=sharing>
Best regards,
Tahmid
On Sat, 20 May 2023 at 16:42, Alexander 'lynxis' Couzens <lynxis(a)fe80.eu>
wrote:
Hi Ahnaf,
the structure of osmocom have changed since the manual has been written.
The manual is written for the long outdated osmo-nitb (a combined BSC,MSC).
I have noticed that the wiki page for OpenBSC
GPRS at
https://osmocom.org/projects/cellular-infrastructure/wiki/OpenBSC_GPRS
has
not been updated for four years, and since then,
there have been
significant updates to the software. As a result, the information on the
GPRS/EDGE Setup page may be outdated, and I am struggling to configure
GPRS
on my system.
I have attached my configuration files below for your review.
I would recommend to take a look into the
https://osmocom.org/projects/cellular-infrastructure/wiki/Osmocom_Network_I…
But you already have configuration files for bsc, msc, sgsn, ggsn.
I would also recommend you to add an IP for every core network component
and ran.
Because it helps debugging to have the IPs seperate.
For a local network (everything runs on the same host) I would do:
* 127.0.0.10 bts + pcu
* 127.0.0.11 bsc + bsc-mgw (yes running mgw twice)j
* 127.0.0.12 msc + osmo-sip-connector + msc-mgw
* 127.0.0.13 sgsn
* 127.0.0.14 ggsn
* 127.0.0.15 sip-server (e.g. asterix, ...)
* 127.0.0.16 hlr
You will need to change vty and ctrl interface ips as well.
Back to your current network.
Are you running osmo-stp? osmo-stp is required for the new network.
Ok. but what is not working? Please add more information!
- Can your MS/UE connect to the network?
- CS: location update works?
- PS: routing area update works?
- Does your phones gets an IP? (PDP Context)
- Does `tcpdump -i tun4 -vn` shows any traffic?
Do you have a pcap trace? (Best to upload it to a website and only send
the link on this mailinglist)
Your tun.network file looks wrong. The device should be named tun4 and the
IP range is also wrong.
Personally I wouldn't use systemd-networkd for this.
At least I would expect routing issues. Also I wonder why there isn't a
tun4 device.
Even if there is a tun4 device, you might missing the routing and
depending on your setup, NAT/masquerading.
I think you would need to run `ip route add 172.16.222.0/24 dev tun4`
and `iptables -t nat -A POSTROUTING -j MASQUERADE -s 172.16.222.0/24 -o
wlp1s0`
Best,
lynxis
21 May
21 May
11:26 a.m.
Hi Tahmid,
- osmo-bsc
<https://docs.google.com/document/d/1mFRtjnOfecCFZSmAaA22GA_EM28rB59dIjftM_UXmPc/edit?usp=sharing>
- osmo-sgsn
<https://docs.google.com/document/d/1r3VfTNPlb-9XWU8FWfALh5kRr9502WgrSMuYXkqHrE0/edit?usp=sharing>
your pcu can't connect to the sgsn. You tell your pcu to connect to 127.0.0.9:23001
The bsc is configuring the pcu via the bts. (bsc -> bts -> pcu)
bsc-config:
[...]
gprs nsvc 0 remote ip 127.0.0.9
gprs nsvc 0 remote udp port 23001
gprs nsvc 0 local udp port 23002
gprs nsvc 0 nsvci 1800
[...]
But in your sgsn configuration you set the listen ip/port to 127.0.0.20:23000
[...]
ns
bind udp local
listen 127.0.0.20 23000
accept-ipaccess
[...]
Please change your bsc configuration to 127.0.0.20 and the remote udp port to 23000
gprs nsvc 0 remote ip 127.0.0.20
gprs nsvc 0 remote udp port 23000
Also your ggsn configuration has:
ip dns 0 127.0.0.1
This will tell the phone to ask itself for dns queries. Please replace it with a valid dns
server (e.g. 1.1.1.1)
Best,
lynxis
On Sat, 20 May 2023 at 16:42, Alexander 'lynxis' Couzens <lynxis(a)fe80.eu>
wrote:
> Hi Ahnaf,
>
> the structure of osmocom have changed since the manual has been written.
> The manual is written for the long outdated osmo-nitb (a combined BSC,MSC).
>
> > I have noticed that the wiki page for OpenBSC GPRS at
> > https://osmocom.org/projects/cellular-infrastructure/wiki/OpenBSC_GPRS
> has
> > not been updated for four years, and since then, there have been
> > significant updates to the software. As a result, the information on the
> > GPRS/EDGE Setup page may be outdated, and I am struggling to configure
> GPRS
> > on my system.
> >
> > I have attached my configuration files below for your review.
>
> I would recommend to take a look into the
>
https://osmocom.org/projects/cellular-infrastructure/wiki/Osmocom_Network_I…
> But you already have configuration files for bsc, msc, sgsn, ggsn.
>
> I would also recommend you to add an IP for every core network component
> and ran.
> Because it helps debugging to have the IPs seperate.
> For a local network (everything runs on the same host) I would do:
>
> * 127.0.0.10 bts + pcu
> * 127.0.0.11 bsc + bsc-mgw (yes running mgw twice)j
> * 127.0.0.12 msc + osmo-sip-connector + msc-mgw
> * 127.0.0.13 sgsn
> * 127.0.0.14 ggsn
> * 127.0.0.15 sip-server (e.g. asterix, ...)
> * 127.0.0.16 hlr
> You will need to change vty and ctrl interface ips as well.
>
>
> Back to your current network.
> Are you running osmo-stp? osmo-stp is required for the new network.
>
> Ok. but what is not working? Please add more information!
>
> - Can your MS/UE connect to the network?
> - CS: location update works?
> - PS: routing area update works?
> - Does your phones gets an IP? (PDP Context)
> - Does `tcpdump -i tun4 -vn` shows any traffic?
>
> Do you have a pcap trace? (Best to upload it to a website and only send
> the link on this mailinglist)
>
> Your tun.network file looks wrong. The device should be named tun4 and the
> IP range is also wrong.
> Personally I wouldn't use systemd-networkd for this.
> At least I would expect routing issues. Also I wonder why there isn't a
> tun4 device.
>
> Even if there is a tun4 device, you might missing the routing and
> depending on your setup, NAT/masquerading.
> I think you would need to run `ip route add 172.16.222.0/24 dev tun4`
> and `iptables -t nat -A POSTROUTING -j MASQUERADE -s 172.16.222.0/24 -o
> wlp1s0`
>
> Best,
> lynxis
>
4:18 p.m.
Hi Lynxis,
This time I am getting this following log.
osmo-pcu
<0009> tbf_dl_fsm.c:372
TBF(DL:TFI-0-0-0:STATE-ASSIGN:GPRS:IMSI-901550000123457:TLLI-0xd586ae05)
releasing due to PACCH assignment timeout.
<0002> pdch.cpp:348 PDCH(bts=0,trx=0,ts=4) PACKET CONTROL ACK with unknown
FN=248629 TLLI=0xd586ae05 (TRX 0 TS 4)
<0002> pdch.cpp:353 PDCH(bts=0,trx=0,ts=4) PACKET CONTROL ACK with unknown
TBF corresponds to MS with IMSI 901550000123457, TA 0, uTBF (TFI=0,
state=None), dTBF (TFI=0, state=ASSIGN)
<0009> tbf_dl_fsm.c:372
TBF(DL:TFI-0-0-0:STATE-ASSIGN:GPRS:IMSI-901550000123457:TLLI-0xd586ae05)
releasing due to PACCH assignment timeout.
<0009> llc.c:326
MS(IMSI-901550000123457:TLLI-0xd586ae05:TA-0:MSCLS-12-12:UL:DL) Discarding
LLC PDU because lifetime limit reached, count=5 new_queue_size=0
<0023> gprs_bssgp_bss.c:236 BSSGP (BVCI=1800) Tx LLC-DISCARDED
TLLI=0xd586ae05, FRAMES=5, OCTETS=40
<0002> pdch_ul_controller.c:324 PDCH(bts=0,trx=0,ts=4) Timeout for
registered POLL (FN=252689, reason=DL_ACK):
TBF(DL:TFI-0-0-0:STATE-FLOW:GPRS:IMSI-901550000123457:TLLI-0xd586ae05)
<0008> tbf.cpp:466
TBF(DL:TFI-0-0-0:STATE-FLOW:GPRS:IMSI-901550000123457:TLLI-0xd586ae05) poll
timeout for FN=252689, TS=4 (curr FN 252689)
<0008> tbf.cpp:543
TBF(DL:TFI-0-0-0:STATE-FLOW:GPRS:IMSI-901550000123457:TLLI-0xd586ae05)
Timeout for polling PACKET DOWNLINK ACK: |Assignment was on PACCH|No
downlink ACK received yet|
osmo-sgsn
20230521195557390 DMM INFO MM(901550000123457/d586ae05) -> ACTIVATE PDP
CONTEXT REQ: SAPI=3 NSAPI=5 (gprs_sm.c:468)
20230521195557390 DMM INFO MM(901550000123457/d586ae05) Found GGSN 0 for
APN 'internet' (requested 'internet') (mmctx.c:578)
20230521195557390 DGPRS NOTICE PDP(901550000123457/0) Create PDP Context
(sgsn_libgtp.c:181)
20230521195557391 DGPRS INFO PDP(901550000123457/0) Received CREATE PDP CTX
CONF, cause=128(Request accepted) (sgsn_libgtp.c:399)
20230521195557391 DSNDCP INFO SNSM-ACTIVATE.ind (lle=0x5651b2543258
TLLI=d586ae05, SAPI=3, NSAPI=5) (gprs_sndcp.c:526)
20230521195557391 DGPRS INFO PDP(901550000123457/0) <- ACTIVATE PDP CONTEXT
ACK (gprs_sm.c:190)
20230521195557391 DLNSDATA INFO NSE(01800)-NSVC(01800) Tx NS-UNITDATA
(gprs_ns2_message.c:426)
20230521195557391 DLLC NOTICE Sending XID type NULL (8 bytes) request to
MS... (gprs_llc.c:364)
20230521195557391 DLNSDATA INFO NSE(01800)-NSVC(01800) Tx NS-UNITDATA
(gprs_ns2_message.c:426)
20230521195557451 DLNSDATA INFO NSE(01800)-NSVC(01800) Rx NS-UNITDATA
(gprs_ns2.c:1311)
20230521195557451 DLNSDATA INFO NSE(01800)-NSVC(01800) Rx NS-UNITDATA
(gprs_ns2_vc_fsm.c:686)
20230521195557451 DMM INFO MM(901550000123457/d586ae05) -> ACTIVATE PDP
CONTEXT REQ: SAPI=3 NSAPI=6 (gprs_sm.c:468)
20230521195557451 DMM INFO MM(901550000123457/d586ae05) Found GGSN 0 for
APN 'internet' (requested 'internet') (mmctx.c:578)
20230521195557451 DGPRS NOTICE PDP(901550000123457/0) Create PDP Context
(sgsn_libgtp.c:181)
20230521195557451 DGPRS INFO PDP(901550000123457/1) Received CREATE PDP CTX
CONF, cause=220(Unknown PDP address or PDP type) (sgsn_libgtp.c:399)
20230521195557451 DMM NOTICE MM(901550000123457/d586ae05) <- ACTIVATE PDP
CONTEXT REJ: Unknown PDP address or PDP type (gprs_sm.c:235)
20230521195557451 DLNSDATA INFO NSE(01800)-NSVC(01800) Tx NS-UNITDATA
(gprs_ns2_message.c:426)
20230521195557931 DLNSDATA INFO NSE(01800)-NSVC(01800) Rx NS-UNITDATA
(gprs_ns2.c:1311)
20230521195557931 DLNSDATA INFO NSE(01800)-NSVC(01800) Rx NS-UNITDATA
(gprs_ns2_vc_fsm.c:686)
20230521195557931 DLLC NOTICE Received XID confirmation from MS.
(gprs_llc.c:329)
20230521195557931 DLLC NOTICE Ignoring XID-Field: XID: type N201_I,
data_len=2, data=05df (gprs_llc.c:202)
20230521195557931 DLLC NOTICE Ignoring XID-Field: XID: type N201_U,
data_len=2, data=01f4 (gprs_llc.c:202)
20230521195557931 DLLC NOTICE Ignoring XID-Field: XID: type VERSION,
data_len=1, data=00 (gprs_llc.c:202)
osmo-ggsn
20230521195334823 DTUN DEBUG TUN(apn0): APN(internet) Rx DL data packet for
IP address outside pool of managed addresses: 224.0.0.251 <- 192.168.1.109
(ggsn.c:629)
20230521195334823 DTUN DEBUG TUN(apn0): APN(internet) Rx DL data packet for
IP address outside pool of managed addresses: 224.0.0.251 <- 192.168.1.109
(ggsn.c:629)
20230521195334834 DTUN DEBUG TUN(apn0): APN(internet) Rx DL data packet for
IP address outside pool of managed addresses: 224.0.0.22 <- 0.0.0.0
(ggsn.c:629)
20230521195335054 DTUN DEBUG TUN(apn0): APN(internet) Rx DL data packet for
IP address outside pool of managed addresses: 224.0.0.22 <- 0.0.0.0
(ggsn.c:629)
20230521195335823 DTUN DEBUG TUN(apn0): APN(internet) Rx DL data packet for
IP address outside pool of managed addresses: 224.0.0.251 <- 192.168.1.109
(ggsn.c:629)
20230521195335823 DTUN DEBUG TUN(apn0): APN(internet) Rx DL data packet for
IP address outside pool of managed addresses: 224.0.0.251 <- 192.168.1.109
(ggsn.c:629)
20230521195337831 DTUN DEBUG TUN(apn0): APN(internet) Rx DL data packet for
IP address outside pool of managed addresses: 224.0.0.251 <- 192.168.1.109
(ggsn.c:629)
20230521195337831 DTUN DEBUG TUN(apn0): APN(internet) Rx DL data packet for
IP address outside pool of managed addresses: 224.0.0.251 <- 192.168.1.109
(ggsn.c:629)
20230521195505388 DLGTP DEBUG Registering seq=8212 in restransmit resp
queue (gtp.c:503)
20230521195505388 DGGSN INFO PDP(901550000123457:5): Deleting PDP context
(ggsn.c:354)
20230521195505388 DGGSN INFO SGSN(127.0.0.9): Deleting SGSN (sgsn.c:21)
20230521195505388 DLGTP DEBUG Begin pdp_tiddel tid = 5754321000055109
(pdp.c:296)
20230521195505388 DLGTP DEBUG End pdp_tiddel: PDP found (pdp.c:303)
20230521195521006 DLGTP DEBUG Retransmit resp queue seq 8212 expired,
removing from queue (gsn.c:291)
20230521195556748 DLGTP DEBUG Begin pdp_tidget tid = 5754321000055109
(pdp.c:322)
20230521195556748 DLGTP DEBUG Begin pdp_tidget. Not found (pdp.c:330)
20230521195556748 DLGTP DEBUG Begin pdp_tidset tid = 5754321000055109
(pdp.c:277)
20230521195556748 DLGTP DEBUG End pdp_tidset (pdp.c:286)
20230521195556748 DGGSN DEBUG PDP(901550000123457:5): Processing create PDP
context request for APN 'internet' (ggsn.c:446)
20230521195556748 DGGSN ERROR PDP(901550000123457:5): APN doesn't support
requested EUA / AF type (ggsn.c:582)
20230521195556749 DLGTP DEBUG Registering seq=8213 in restransmit resp
queue (gtp.c:503)
20230521195556749 DGGSN INFO PDP(901550000123457:5): Deleting PDP context
(ggsn.c:354)
20230521195556749 DGGSN NOTICE PDP(901550000123457:5): Deleting PDP
context: without private structure! (ggsn.c:367)
20230521195556749 DLGTP DEBUG Begin pdp_tiddel tid = 5754321000055109
(pdp.c:296)
20230521195556749 DLGTP DEBUG End pdp_tiddel: PDP found (pdp.c:303)
20230521195556749 DGGSN NOTICE GGSN(ggsn0): Received Recovery IE for
unknown SGSN (no PDP contexts active) (ggsn.c:806)
20230521195557391 DLGTP DEBUG Begin pdp_tidget tid = 5754321000055109
(pdp.c:322)
20230521195557391 DLGTP DEBUG Begin pdp_tidget. Not found (pdp.c:330)
20230521195557391 DLGTP DEBUG Begin pdp_tidset tid = 5754321000055109
(pdp.c:277)
20230521195557391 DLGTP DEBUG End pdp_tidset (pdp.c:286)
20230521195557391 DGGSN DEBUG PDP(901550000123457:5): Processing create PDP
context request for APN 'internet' (ggsn.c:446)
20230521195557391 DGGSN INFO SGSN(127.0.0.9): Discovered (sgsn.c:83)
20230521195557391 DGGSN DEBUG PDP(901550000123457:5): PCO Protocol 0x8021
(pco.c:205)
20230521195557391 DGGSN DEBUG PDP(901550000123457:5): PCO Protocol 0x000d
(pco.c:205)
20230521195557391 DGGSN DEBUG PDP(901550000123457:5): PCO Protocol 0x000a
(pco.c:205)
20230521195557391 DGGSN INFO PDP(901550000123457:5): Unknown/Unimplemented
PCO Protocol 0x000a: (pco.c:220)
20230521195557391 DGGSN DEBUG PDP(901550000123457:5): PCO Protocol 0x0005
(pco.c:205)
20230521195557391 DGGSN INFO PDP(901550000123457:5): Unknown/Unimplemented
PCO Protocol 0x0005: (pco.c:220)
20230521195557391 DGGSN DEBUG PDP(901550000123457:5): PCO Protocol 0x0010
(pco.c:205)
20230521195557391 DGGSN INFO PDP(901550000123457:5): Unknown/Unimplemented
PCO Protocol 0x0010: (pco.c:220)
20230521195557391 DGGSN INFO PDP(901550000123457:5): Successful PDP Context
Creation: APN=internet(internet), TEIC=1, IPv4=127.0.42.13, IPv6=none
(ggsn.c:569)
20230521195557391 DLGTP DEBUG Registering seq=8214 in restransmit resp
queue (gtp.c:503)
20230521195557451 DLGTP DEBUG Begin pdp_tidget tid = 6754321000055109
(pdp.c:322)
20230521195557451 DLGTP DEBUG Begin pdp_tidget. Not found (pdp.c:330)
20230521195557451 DLGTP DEBUG Begin pdp_tidset tid = 6754321000055109
(pdp.c:277)
20230521195557451 DLGTP DEBUG End pdp_tidset (pdp.c:286)
20230521195557451 DGGSN DEBUG PDP(901550000123457:6): Processing create PDP
context request for APN 'internet' (ggsn.c:446)
20230521195557451 DGGSN ERROR PDP(901550000123457:6): APN doesn't support
requested EUA / AF type (ggsn.c:582)
20230521195557451 DLGTP DEBUG Registering seq=8215 in restransmit resp
queue (gtp.c:503)
20230521195557451 DGGSN INFO PDP(901550000123457:6): Deleting PDP context
(ggsn.c:354)
20230521195557451 DGGSN ERROR PDP(901550000123457:6): Cannot find/free IP
Pool member (ggsn.c:362)
20230521195557451 DGGSN NOTICE PDP(901550000123457:6): Deleting PDP
context: without private structure! (ggsn.c:367)
20230521195557451 DLGTP DEBUG Begin pdp_tiddel tid = 6754321000055109
(pdp.c:296)
20230521195557451 DLGTP DEBUG End pdp_tiddel: PDP found (pdp.c:303)
20230521195612002 DLGTP DEBUG Retransmit resp queue seq 8213 expired,
removing from queue (gsn.c:291)
20230521195613002 DLGTP DEBUG Retransmit resp queue seq 8214 expired,
removing from queue (gsn.c:291)
20230521195613002 DLGTP DEBUG Retransmit resp queue seq 8215 expired,
removing from queue (gsn.c:291)
osmo-bts-trx
<0000> rsl.c:1389 (bts=0,trx=0,ts=2,ss=0) not sending CHAN ACT ACK
<0000> rsl.c:1389 (bts=0,trx=0,ts=3,ss=0) not sending CHAN ACT ACK
<0000> rsl.c:1389 (bts=0,trx=0,ts=4,ss=0) not sending CHAN ACT ACK
<0000> rsl.c:1389 (bts=0,trx=0,ts=7,ss=0) not sending CHAN ACT ACK
<0000> rsl.c:1389 (bts=0,trx=0,ts=5,ss=0) not sending CHAN ACT ACK
<0000> rsl.c:1389 (bts=0,trx=0,ts=6,ss=0) not sending CHAN ACT ACK
I have set apn as internet in my android device. And, I didn't configure
any auth policy in osmo-hlr. Sims are registering through IMSI.
[image: image.png]
Best regards,
Tahmid
On Sun, 21 May 2023 at 15:29, Alexander 'lynxis' Couzens <lynxis(a)fe80.eu>
wrote:
Hi Tahmid,
your pcu can't connect to the sgsn. You tell your pcu to connect to
127.0.0.9:23001
The bsc is configuring the pcu via the bts. (bsc -> bts -> pcu)
bsc-config:
[...]
gprs nsvc 0 remote ip 127.0.0.9
gprs nsvc 0 remote udp port 23001
gprs nsvc 0 local udp port 23002
gprs nsvc 0 nsvci 1800
[...]
But in your sgsn configuration you set the listen ip/port to
127.0.0.20:23000
[...]
ns
bind udp local
listen 127.0.0.20 23000
accept-ipaccess
[...]
Please change your bsc configuration to 127.0.0.20 and the remote udp port
to 23000
gprs nsvc 0 remote ip 127.0.0.20
gprs nsvc 0 remote udp port 23000
Also your ggsn configuration has:
ip dns 0 127.0.0.1
This will tell the phone to ask itself for dns queries. Please replace it
with a valid dns server (e.g. 1.1.1.1)
Best,
lynxis
> On Sat, 20 May 2023 at 16:42,
Alexander 'lynxis' Couzens <lynxis(a)fe80.eu
> wrote:
> > Hi Ahnaf,
> > > the structure of osmocom
have changed since the manual has been
written.
> > > I have noticed that
the wiki page for OpenBSC GPRS at
> >
https://osmocom.org/projects/cellular-infrastructure/wiki/OpenBSC_GPRS
> > > I have attached
my configuration files below for your review.
> > > I would recommend to take a
look into the
>
https://osmocom.org/projects/cellular-infrastructure/wiki/Osmocom_Network_I…
> > But you already have configuration files for bsc, msc, sgsn, ggsn.
> > > I would also recommend you
to add an IP for every core network
component
> > and ran.
> > Because it helps debugging to have the IPs seperate.
> > For a local network (everything runs on the same host) I would do:
> > > * 127.0.0.10 bts + pcu
> > * 127.0.0.11 bsc + bsc-mgw (yes running mgw twice)j
> > * 127.0.0.12 msc + osmo-sip-connector + msc-mgw
> > * 127.0.0.13 sgsn
> > * 127.0.0.14 ggsn
> > * 127.0.0.15 sip-server (e.g. asterix, ...)
> > * 127.0.0.16 hlr
> > You will need to change vty and ctrl interface ips as well.
> > > > Back to your current network.
> > Are you running osmo-stp? osmo-stp is required for the new network.
> > > Ok. but what is not
working? Please add more information!
> > > - Can your MS/UE connect to
the network?
> > - CS: location update works?
> > - PS: routing area update works?
> > - Does your phones gets an IP? (PDP Context)
> > - Does `tcpdump -i tun4 -vn` shows any traffic?
> > > Do you have a pcap trace?
(Best to upload it to a website and only send
> > the link on this mailinglist)
> > > Your tun.network file looks
wrong. The device should be named tun4 and
the
> > IP range is also wrong.
> > Personally I wouldn't use systemd-networkd for this.
> > At least I would expect routing issues. Also I wonder why there isn't a
> > tun4 device.
> > > Even if there is a tun4
device, you might missing the routing and
> > depending on your setup, NAT/masquerading.
> > I think you would need to run `ip route add 172.16.222.0/24 dev tun4`
> > and `iptables -t nat -A POSTROUTING -j MASQUERADE -s 172.16.222.0/24
-o
> > wlp1s0`
> > > Best,
> > lynxis
>
- osmo-bsc
<
https://docs.google.com/document/d/1mFRtjnOfecCFZSmAaA22GA_EM28rB59dIjftM_U…
- osmo-sgsn
<
https://docs.google.com/document/d/1r3VfTNPlb-9XWU8FWfALh5kRr9502WgrSMuYXkq…
> The manual is written for the long outdated
osmo-nitb (a combined
BSC,MSC).
> > has
> > not been updated for four years, and since then, there have been
> > significant updates to the software. As a result, the information on
the
> > GPRS/EDGE Setup page may be outdated,
and I am struggling to
configure
> > GPRS
> > > on my system.
> >
29 May
29 May
10:27 a.m.
Hi,
On 5/21/23 16:17, Ahnaf Tahmid wrote:
20230521195557391 DGGSN INFO PDP(901550000123457:5):
Successful PDP
Context Creation: APN=internet(internet), TEIC=1, IPv4=127.0.42.13,
IPv6=none (ggsn.c:569)
The problem is most probably that osmo-ggsn is assigning to
the MS an Ip
address from the 12.0.42.0-255 range, which is iirC of local host scope.
Try changing the address pool in the APN config in osmo-ggsn.cfg to
provide a local area network range, such as 192.168.40.100-200. Also
update accordingly the IP address set on the related tun device.
--
- Pau Espin Pedrol <pespin(a)sysmocom.de> http://www.sysmocom.de/
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osmocom-net-gprs@lists.osmocom.org
5 comments
3 participants
participants (3)
-
Ahnaf Tahmid -
Alexander 'lynxis' Couzens -
Pau Espin Pedrol