Running OpenGGSN with UmTRX(Osmobts-trx)

Joe Ge jijo123789 at gmail.com
Thu May 15 09:52:40 UTC 2014


Hi Ivan,

I tried with the specified package and the configuration files and all the
modules seem to be executing properly.
Thanks a lot for the help with that.

But there is still some issue as the tunnel doesn't seem to be set up
properly.

*GGSN Output*
......
encaps_tun. Packet received: forwarding to tun
encaps_tun. Packet received: forwarding to tun
encaps_tun. Packet received: forwarding to tun
.....

*OSMO-PCU Output*
...........
008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL) len=85
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=70
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=71
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=79
<0007> gprs_rlcmac_meas.cpp:104 UL RSSI of TLLI=0xdeacae72: -65 dBm
<0007> gprs_rlcmac_meas.cpp:104 UL RSSI of TLLI=0xdeacae72: -66 dBm
<0001> pcu_l1_if.cpp:282 RACH request received: sapi=1 qta=0, ra=121,
fn=2234747
<0002> tbf.cpp:1503 TBF(TFI=0 TLLI=0x00000000 DIR=UL) changing tlli from
TLLI=0x00000000 TLLI=0xdeacae72 ul_changed=0
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=70
<0007> gprs_rlcmac_meas.cpp:104 UL RSSI of TLLI=0xdeacae72: -65 dBm
<0001> pcu_l1_if.cpp:282 RACH request received: sapi=1 qta=0, ra=121,
fn=2234916
<0002> tbf.cpp:1503 TBF(TFI=0 TLLI=0x00000000 DIR=UL) changing tlli from
TLLI=0x00000000 TLLI=0xdeacae72 ul_changed=0
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=88
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=71
<0007> gprs_rlcmac_meas.cpp:104 UL RSSI of TLLI=0xdeacae72: -65 dBm
<0001> pcu_l1_if.cpp:282 RACH request received: sapi=1 qta=0, ra=123,
fn=2235089
<0002> tbf.cpp:1503 TBF(TFI=0 TLLI=0x00000000 DIR=UL) changing tlli from
TLLI=0x00000000 TLLI=0xdeacae72 ul_changed=0
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=88
<0007> gprs_rlcmac_meas.cpp:104 UL RSSI of TLLI=0xdeacae72: -65 dBm
<0001> pcu_l1_if.cpp:282 RACH request received: sapi=1 qta=0, ra=121,
fn=2235910
<0002> tbf.cpp:1503 TBF(TFI=0 TLLI=0x00000000 DIR=UL) changing tlli from
TLLI=0x00000000 TLLI=0xdeacae72 ul_changed=0
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=88
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=70
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=71
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=71
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=81
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=71
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=81
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=60
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=60
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=88
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=81
<0007> gprs_rlcmac_meas.cpp:104 UL RSSI of TLLI=0xdeacae72: -66 dBm
<0001> pcu_l1_if.cpp:282 RACH request received: sapi=1 qta=0, ra=123,
fn=2236160
<0002> tbf.cpp:1503 TBF(TFI=0 TLLI=0x00000000 DIR=UL) changing tlli from
TLLI=0x00000000 TLLI=0xdeacae72 ul_changed=0
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=88
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=88
<0007> gprs_rlcmac_meas.cpp:104 UL RSSI of TLLI=0xdeacae72: -66 dBm
<0001> pcu_l1_if.cpp:282 RACH request received: sapi=1 qta=0, ra=123,
fn=2236313
<0002> tbf.cpp:1503 TBF(TFI=0 TLLI=0x00000000 DIR=UL) changing tlli from
TLLI=0x00000000 TLLI=0xdeacae72 ul_changed=0
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=71
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=88
<0008> tbf.cpp:1691 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0xdeacae72 DIR=UL)
len=88
<0007> gprs_rlcmac_meas.cpp:104 UL RSSI of TLLI=0xdeacae72: -66 dBm
<0001> pcu_l1_if.cpp:282 RACH request received: sapi=1 qta=0, ra=120,
fn=2237386
<0002> tbf.cpp:1503 TBF(TFI=0 TLLI=0x00000000 DIR=UL) changing tlli from
TLLI=0x00000000 TLLI=0xdeacae72 ul_changed=0
...........


The DNS query seems to be reaching the SGSN and getting encapsulated in GTP
from there on.
But the wireshark trace shows that there is no packet captured for the tap0
interface.

Any suggestions


On Tue, May 13, 2014 at 7:15 PM, Ivan Kluchnikov <
Ivan.Kluchnikov at fairwaves.ru> wrote:

> Hi Joe,
>
> If you use UmDESK, osmo-trx, osmo-bts, osmo-nitb and osmo-sgsn should
> be already installed.
> So you should use following manual:
>
> === Build & Install ===
> [osmo-pcu]
> git clone git://git.osmocom.org/osmo-pcu
> cd osmo-pcu/
> git checkout sysmocom/master
> autoreconf -i
> ./configure --enable-sysmocom-bts
> make
> cd ..
>
> [openggsn]
> git clone git://git.osmocom.org/openggsn.git
> cd openggsn/
> autoreconf -i
> ./configure
> make
> sudo make install
> cd ..
>
> === Configuration ===
>
> [openggsn configuration]
> Copy ggsn.conf to /etc directory
>
> [sgsn configuration]
> Copy osmo_sgsn.cfg to openbsc/openbsc/src/gprs directory
>
>
> [Network configuration]
> # We use eth0 interface for connection to the internet, if you use
> other interface, you should edit fourth line.
> sudo tunctl
> sudo ifconfig tap0 127.0.0.2 up
> sudo echo 1 > /proc/sys/net/ipv4/ip_forward
> sudo iptables -A POSTROUTING -s 10.0.254.0/24 -t nat -o eth0 -j MASQUERADE
>
>
> [OpenBSC configuration]
>
> Add this to the network/bts node in openbsc.cfg:
>
> gprs mode gprs
> gprs routing area 0
> gprs cell bvci 2
> gprs nsei 101
> gprs nsvc 0 nsvci 101
> gprs nsvc 0 local udp port 23030
> gprs nsvc 0 remote udp port 23000
> gprs nsvc 0 remote ip 127.0.0.1
>
> Allocate some timeslots to packet data (recommend to use at least 4
> timeslots for gprs).
> For this, just change network/bts/trx/timeslot nodes using :
>
> phys_chan_config PDCH
>
>
> === Start ===
>
> 1. ggsn
> 2. sgsn
> 3. pcu
> 4. osmo-nitb
> 5. osmo-bts
> 6. osmo-trx
>
> 2014-05-13 14:11 GMT+04:00 Joe Ge <jijo123789 at gmail.com>:
> >
> > Hi All,
> >
> > I have installed OpenBSC +Osmo-BTS following Osmocom's netwrok from
> scratch
> > link http://openbsc.osmocom.org/trac/wiki/network_from_scratch
> > Now I would like to implemenet GPRS facility in the testbedusing OpenGGSN
> > and Osmo-SGSN.
> >
> > I am using fairwaves UmDESK for this implementation.
> >
> > I followed the procedure as suggested in the
> > http://openbsc.osmocom.org/trac/wiki/OpenBSC_GPRS
> > with the added modification as suggested in
> > https://wush.net/trac/rangepublic/wiki/fairwaves.gprs
> >
> > But this doesn't seem to work out.
> >
> > Currently the systems execute properly with the following outputs
> >
> > GGSN Output:
> >
> > root at nist:/home/nist# ggsn
> > cmdline_parser_configfile
> > listen: 127.0.0.1
> > conf: /etc/ggsn.conf
> > fg: 1
> > debug: 1
> > qos: 0x0b921f
> > apn: internet
> > net: 192.168.0.0/24
> > dynip: 192.168.0.0/24
> > pidfile: /var/run/ggsn.pid
> > statedir: /var/lib/ggsn/
> > timelimit: 0
> > gtpclient: Initialising GTP tunnel
> > openggsn[3822]: GTP: gtp_newgsn() started
> > Creating tun interface
> > Setting tun IP address
> >
> > Osmo-SGSN Output:
> > root at nist:/home/nist# osmo-sgsn -c
> > OpenBSC_GPRS/openbsc/openbsc/src/gprs/osmo_sgsn.cfg
> > <0010> gprs_ns.c:199 NSVCI=65534 Creating NS-VC
> >
> > Osmo-PCU Output:
> > root at nist:/home/nist# osmo-pcu
> > No config file: 'osmo-pcu.cfg' Using default config.
> >
> > With these I also ran:
> > Osmo-NITB
> > Osmobts-TRX
> > Osmo-TRX
> >
> > All of these run normally as well.
> > My UE is able to detect the network as well but not able to connect with
> it.
> >
> > Given below are the config file entries
> >
> > ggsn.conf:
> > listen 127.0.0.1
> >
> > osmo-sgsn.cfg:
> > gtp local-ip 127.0.0.2
> > ggsn 0 remote-ip 127.0.0.1
> > .....
> >  encapsulation udp local-ip 127.0.0.2
> >
> > open-bsc.cfg:
> >   gprs nsvc 0 remote udp port 23000
> >   gprs nsvc 0 remote ip 127.0.0.2
> >
> > I had the following doubts regarding the given installation procedure
> >
> > 1. The fairwaves.gprs implementation using Chemeris's gprs-work seems to
> > implement with Asterisk as PBX whereas I require it to run with the
> > osmo-nitb.
> >
> > 2. The gprs-work branch still makes use of BTS transceiver and I wanted
> it
> > to work with the Osmo-nitb implementation using osmobts-trx and osmo-trx
> >
> > Can somebody please help me out with this?
> >
> > Or is there any alternative implementation which can be tried to execute
> > them together.
> >
> > Looking forward to hearing from you,
> >
> > With Regards,
> > Jijo
> >
>
>
>
> --
> Regards,
> Ivan Kluchnikov.
> http://fairwaves.ru
>
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