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Thanks Pau, I'll check it out and share my results with you. On Mon, Feb 8, 2021 at 1:05 PM Pau Espin Pedrol <pespin at sysmocom.de> wrote: > Hi, > > you are probably facing a routing issue, and you need to solve it by > using different network namespaces (netns). > In your current setup, you probably have routing for those DNS packets > to go through the sgsnemu iface, and once the ggsn puts them again in > the network stack after going through GTP, the kernel probably ends up > dropping the packet because it finds out some sort of loop. > > In order to solve it, the easiest is to run sgsnemu under a different > netns, and set default routing inside that netns to the tun iface > created by sgsnemu. AFAIR, the netns can take care of creating the netns > and configuring it for you, check it's man page ("--defaultroute", > "--netns"). > > Hope this is useful to you, > Pau > > -- > - Pau Espin Pedrol <pespin 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 > * Geschaeftsfuehrer / Managing Director: Harald Welte > -- *When there is much light, The shadow is deep...* -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/osmocom-net-gprs/attachments/20210209/b388b7ba/attachment.htm>