Cellular Network Infrastructure

[[PageOutline]]

= OpenBSC GPRS/EDGE Setup page =

== Pre-requisites ==

 * A nano BTS with GPRS or EDGE support. BS-11 are not supported (yet?)

 * A compiled GGSN from OpenGGSN ( http://sourceforge.net/projects/ggsn/ )

 * A working and up-to-date OpenBSC (see [wiki:Building_OpenBSC])

   * You will need to (re-)build it after having installed OpenGGSN so that the libgtp is detected and the SGSN binary osmo-sgsn built.

== Setup ==

[[Image(gprs.png)]]

=== OpenBSC configuration ===

{{{

     phys_chan_config PDCH

}}}

{{{

  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 23000

  gprs nsvc 0 remote udp port 23000

  gprs nsvc 0 remote ip 192.168.0.128

}}}

=== Osmocom SGSN configuration ===

{{{

!

! Osmocom SGSN configuration

!

!

line vty

 no login

!

sgsn

 gtp local-ip 192.168.1.128

 ggsn 0 remote-ip 192.168.1.129

 ggsn 0 gtp-version 1

!

ns

 timer tns-block 3

 timer tns-block-retries 3

 timer tns-reset 3

 timer tns-reset-retries 3

 timer tns-test 30

 timer tns-alive 3

 timer tns-alive-retries 10

 encapsulation udp local-ip 192.168.0.128

 encapsulation udp local-port 23000

 encapsulation framerelay-gre enabled 0

!

bssgp

!

}}}

=== OpenGGSN configuration ===

{{{

# TAG: listen

# Specifies the local IP address to listen to

listen 192.168.1.129

}}}

{{{

# TAG: dynip

# Dynamic IP address pool.

# Used for allocation of dynamic IP address when address is not given

# by HLR.

# If this option is not given then the net option is used as a substitute.

dynip 192.168.254.0/24

# TAG: pcodns1/pcodns2

# Protocol configuration option domain name system server 1 & 2.

pcodns1 208.67.222.222

pcodns2 208.67.220.220

}}}

=== Network configuration ===

You will also need to configure some networking rules to allow connectivity from `tun0`. Look up linux networking/nat howtos on google.

The basic setup for testing only in a safe environment would be :

{{{

bash# echo 1 > /proc/sys/net/ipv4/ip_forward

bash# iptables -A POSTROUTING -s 192.168.254.0/24 -t nat -o eth0 -j MASQUERADE

}}} 

(replace `eth0` by the interface providing your machine connectivity)

== Running ==

# FIXME