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Diffstat (limited to 'README')
| -rw-r--r-- | README | 43 |
1 files changed, 36 insertions, 7 deletions
@@ -96,15 +96,18 @@ the testing of roaming connectivity through a GPRS roaming exchange. Two experiments were performed in order to test the performance of sgsnemu and ggsn. The ggsn used a 550 MHz Athlon with 384 MB of RAM. sgsnemu used a 1 GHz Athlon with 256 MB of RAM. Both machines had -100 Mb/s NICs and were connected through a Netgear FS105 switch. Both -tests were performed by sending ICMP echo packets from the ggsn to -sgsnemu. +100 Mb/s NICs (RTL-8139) and were connected through a crossed patch +cable. Both tests were performed by sending ICMP echo packets from +sgsnemu to the ggsn. -89.4 Mb/s IP downlink throughput when sending 10001 ICMP ping packets -with a payload of 1000 bytes. Transfer time 0.9 sec, no packets lost. +89.5 Mb/s IP throughput when sending 10000 ICMP ping packets with a +payload of 1400 bytes. Transfer time 1.27 sec, no packets lost. -17,1 Mb/s IP downlink throughput when sending 10001 ICMP ping packets with -a payload of 100 bytes. Transfer time 0.6 sec, no packets lost. +71.4 Mb/s IP throughput when sending 10000 ICMP ping packets with a +payload of 1000 bytes. Transfer time 1.15 sec, no packets lost. + +12,1 Mb/s IP throughput when sending 10000 ICMP ping packets with a +payload of 100 bytes. Transfer time 0.84 sec, no packets lost. *** Required software *** @@ -191,6 +194,32 @@ Use ggsn -h for a list of available options. All options available on the command line can also be given in a configuration file. See examples/ggsn.conf for the format of this file. +Start the ggsn as root using the command: + + ggsn -c examples/ggsn.conf --fg -l 10.20.30.40 --net 192.168.0.0 --mask 255.255.0.0 + +First a tun network interface will be created. In the above example +the network interface address is 192.168.0.0 and the mask is +255.255.0.0. You can check that this interface is up by using +ifconfig. + +After tun has been successfully established the ggsn will wait for GTP +create PDP context requests on the local interface +10.20.30.40. Currently all requests are excepted, and no password, +username or APN validation is performed. + +When receiving a create PDP context request a dynamic IP address will +be allocated from the address pool determined by --net and --mask. In +the above example the first allocated address will be 192.168.0.1, +followed by 192.168.0.2 and so on. The request is confirmed by sending +a create PDP context response message to the peer (SGSN). + +Now IP packets will be forwarded between the tun network interface and +the established GTP tunnel. In order to allow users to access the +external network routing needs to be set up. If private addresses are +are used you need to configure network address translation. See the +Linux Networking HOWTO for details. + Remember to enable routing: echo 1 > /proc/sys/net/ipv4/ip_forward *** Running sgsnemu *** |