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Terje Kristoffer Hybbestad Skow terjeks at stud.ntnu.noThank you Neels! The "logfile /tmp/foo" did gave an error message saying "unrecognized option". 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 an idea of how to set up the testbed, but I do not know which of the nodes I really need. Do you have any idea? Regards Terje Kristoffer Skow 2016-02-29 18:50 GMT+01:00 Neels Hofmeyr <nhofmeyr at sysmocom.de>: > Hey Terje, > > On Mon, Feb 29, 2016 at 12:46:30PM +0100, Terje Kristoffer Hybbestad Skow > wrote: > > Does this mailinglist also regard openGGSN? > > Yes, the Osmocom community has adopted maintenance of OpenGGSN, even > though it > wasn't written "here". > > > If so do I have some questions. I have problem setting it up correctly. > > To test the basic openggsn I used to do something like this: > > > sudo -s > > LD_LIBRARY_PATH=/usr/local/lib ./git/openggsn/ggsn/ggsn -f -c > ./localggsn.conf & > > ./git/openggsn/sgsnemu/sgsnemu --createif -l 127.0.0.1 -r 127.0.0.2 > > > With localggsn.conf as > > listen 127.0.0.2 > net 127.0.0.0/24 > pcodns1 8.8.8.8 > logfile /tmp/foo > > > The above works on linux because it allows implicitly creating the > 127.*.*.* > interfaces. On other OSes, you'd have to create those first on one of your > network interfaces. > > See http://git.osmocom.org/openggsn/tree/examples/ggsn.conf for more > config > options. > > I'd recommend to use wireshark to see what packets are transmitted back and > forth, if you're not already doing that. > > I've "recently" implemented GTPhub, which relays GTP, e.g. through a NAT. > If > that's of interest too, call again, and I can give you an example config > for > testing sgsnemu -> gtphub -> openggsn, too. > > To actually relay data through the tunnel interface that is created, AFAIK > you > first need to send a Create PDP Context message to the GGSN. Maybe read > http://git.osmocom.org/openbsc/tree/openbsc/tests/gtphub/gtphub_test.c > For testing real data, I used an actual sysmoBTS with a "special" SIM card > instead of sgsnemu, because here in the lab that was easier... :P > > Hope to have helped :) > > ~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/20160301/5821e0c5/attachment.htm>