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Terje Kristoffer Hybbestad Skow terjeks at stud.ntnu.noHi again. I'm still having problem really getting the sgsnemu and ggsn to talk to each other. When I use 127.0.0.1 and 127.0.0.2 as the listen and remote for the sgsnemu and 127.0.0.2 as listen and 127.0.0.0/24 as network in the ggsn conf, the sgsnemu says "Received echo response Received create PDP context response. IP address: 127.0.0.2" and then nothing happens. When using two computers, one running ggsn and one sgsnemu with the ip-addresses as 192.168.1.14 and 192.168.1.11 respectively, the sgsnemu doesn't seem to get connented. It prints out "idletime.tv_sec 3, idleTime.tv_usec 0" over and over, and "Echo Request timed out". The picture attached is from wireshark on the ggsn computer. I lookt at the pcap you send and it looks like what I would like for my setup. You talk mentioned using symoBTS how much does it cost? And how long is a delivery for it? Regards Terje Skow 2016-03-01 12:56 GMT+01:00 Terje Kristoffer Skow <terjeks at stud.ntnu.no>: > Thank you very much!! > > I will have some work getting through this, but I recon I'll have some > more questions later. > > Again thank you > > 2016-03-01 12:39 GMT+01:00 Neels Hofmeyr <nhofmeyr at sysmocom.de>: > >> On Tue, Mar 01, 2016 at 11:12:01AM +0100, Terje Kristoffer Hybbestad Skow >> wrote: >> > The "logfile /tmp/foo" did gave an error message saying "unrecognized >> > option". >> >> It seems the logfile option was added on 2014-03-23 with commit >> 9c0ff4fafe4276396125a52c89d36967566fe08c. It may make sense if you build >> your osmocom stack from the git sources to benefit from the latest fixes. >> >> See http://git.osmocom.org, specifically you'd probably want to clone >> and build >> >> git://git.osmocom.org/libosmocore >> git://git.osmocom.org/openggsn >> >> The build steps being for example >> >> autoreconf -fi >> ./configure >> make >> sudo make install >> >> >> > I'm going to look at DNS packets going through a GGSN to try and find >> ways >> > to detect DNS tunnels, do you have any recommendations how to do this? >> > I do not have the time or resources to use real UE's so I hope to >> simulate >> > it on a computer using VMs or something like that. >> >> > I have looked at this: >> http://openbsc.osmocom.org/trac/wiki/OpenBSC_GPRS as >> >> The BTS is for communicating with a phone over the air interface. Abis and >> osmo-nitb are used for voice calls only. The SGSN is needed for real >> networks, >> you should be fine with the sgsnemu. So all you need is sgsnemu and >> openggsn. >> >> You want to figure out how to use the sgsnemu, starting with a route into >> the >> tunnel device that sgsnemu opens up. So you need to look at the 'ip route' >> commands (if you're on linux). I guess you won't need VMs; granted, it >> might >> make it easier to avoid circular routes (to IP addresses that should only >> be >> seen on the GGSN side), but certainly not a necessary prerequisite. >> >> I tried to ping through the sgsnemu tunnel once but saw, as I mentioned, >> that >> the GGSN thwarts GTP messages without a proper context being created >> first. It >> shouldn't be too hard, but I haven't investigated further. So you'd want >> to >> understand the GTP Ctrl & User messages to setup a PGP context (TEIs and >> stuff), and figure out how sgsnemu might make your life easier in that >> regard. >> You probably want to read ETSI 29.060 to figure out GTP: >> >> http://www.etsi.org/deliver/etsi_ts/129000_129099/129060/03.19.00_60/ts_129060v031900p.pdf >> You may find attached pcap file interesting (open in wireshark and note >> that >> the DNS queries are transmitted over GTP between SGSN and GGSN even though >> wireshark tends to show only the DNS and src/dest enclosed in the GTP). >> And again, you may look at >> http://git.osmocom.org/openbsc/tree/openbsc/tests/gtphub/gtphub_test.c >> about simplistic code examples of composing a PGP context conversation. >> >> If you'd like any more answers to questions you didn't ask ;) >> just give us a shout... >> >> ~Neels >> >> -- >> - Neels Hofmeyr <nhofmeyr at sysmocom.de> http://www.sysmocom.de/ >> ======================================================================= >> * sysmocom - systems for mobile communications GmbH >> * Alt-Moabit 93 >> * 10559 Berlin, Germany >> * Sitz / Registered office: Berlin, HRB 134158 B >> * Geschäftsführer / Managing Directors: Holger Freyther, Harald Welte >> > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/osmocom-net-gprs/attachments/20160411/ef847f82/attachment.htm> -------------- next part -------------- A non-text attachment was scrubbed... Name: wireshark.png Type: image/png Size: 48442 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/osmocom-net-gprs/attachments/20160411/ef847f82/attachment.png>