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Keith A. Milner maillist at superlative.orgOn Tuesday, 13 April 2021 13:14:48 BST Harald Welte wrote: > Hi Keith, > > On Tue, Apr 13, 2021 at 11:10:18AM +0100, Keith A. Milner wrote: > > However, if I change to using Kernel GTP, by changing the gtpu-mode to > > "kernel-gtp", traffic will not route (and, yes, I have done modprobe gtp). > > After some exploration, it appears the tun device is being created with > > an MTU of > > zero which then, cannot pass traffic: > I think this one is fixed in > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/dr > ivers/net?id=e21eb3a065a2d90ee3bb06cc2e77acad403ec7cd but "of course" Debian > 10 is using a too old kernel to contain that fix. Ah, missed that. Thanks Harald. > > You could ask Debian if they'd back-port it to the stable kernel? It's not that big of an issue for me, as this is just for some testing. I was mainly concerned I had missed some configuration somewhere. As I can use the ipup-script this will work for me. > > We would certainly also be happy to accept a patch mentioning this in the > user manual, or a patch that makes osmo-ggsn check the MTU at startup time > and print some big error message into the log. I will have a look at that, probably at the former rather than the latter. Thanks once again. Keith