gtphub: add gtphub-example.txt
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Here is a simple setup to test GTPHub operations. The IP addresses picked will
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work well only on a system that creates local addresses (127.0.0.123) on the
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fly (like linux) -- you may pick of course different IP addresses.
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Overview of the example setup:
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sgsnemu gtphub ggsn
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127.0.0.1 <--> 127.0.0.3 127.0.0.4 <--> 127.0.0.2
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Prerequisites: openggsn.
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Have a local directory where you store config files and from which you launch
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the GSNs and the hub (they will store restart counter files in that dir).
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In it, have these config files:
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ggsn.conf:
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# GGSN local address
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listen 127.0.0.2
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# End User Addresses are picked from this range
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net 10.23.42.0/24
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pcodns1 8.8.8.8
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logfile /tmp/foo
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gtphub.conf:
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gtphub
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bind-to-sgsns 127.0.0.3
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bind-to-ggsns 127.0.0.4
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ggsn-proxy 127.0.0.2
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end
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(
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You may omit the ggsn-proxy if GRX ares is working, or if you add the GRX
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address and GGSN IP address to /etc/hosts something like:
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127.0.0.2 internet.mnc070.mcc901.gprs
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)
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Once the config files are in place, start the programs, in separate terminals.
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GGSN and SGSN need to be started with root priviliges to be able to create tun
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interfaces. GTPHub may run as unprivileged user.
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The LD_LIBRARY_PATH below may be needed if OpenGGSN installed to /usr/local.
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1. GGSN:
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sudo -s
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cd <your-test-dir>
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LD_LIBRARY_PATH=/usr/local/lib /usr/local/bin/ggsn -f -c ./ggsn.conf
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2. GTPHub:
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cd <your-test-dir>
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path/to/openbsc/openbsc/src/gprs/osmo-gtphub -c gtphub.conf #-e 1 #for DEBUG level
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3. SGSN test:
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sudo -s
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cd <your-test-dir>
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/usr/local/bin/sgsnemu --createif -l 127.0.0.1 -r 127.0.0.3 --contexts=3
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This shows the basic setup of GTPHub. Testing internet traffic via sgsnemu
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still needs some effort to announce a mobile subscriber or the like (I have
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used a real BTS, osmo-sgsn and a testing SIM in a web phone, instead).
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I hope this helps to get you going.
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Any suggestions/patches are welcome!
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~Neels
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