On Thu, Oct 06, 2022 at 02:34:48AM +0300, Martin Zaharinov wrote: > Hi Team > > I make test image with kernel 6.0.0 and schem is : > > internet <> router NAT <> windows client pptp > > with l2tp all is fine and connections is establesh. > > But when try to make pptp connection stay on finish phase and not connect . > > try to remove module : nf_conntrack_pptp and same not work. > > > how to debug and find why not work ? Can you see events via: conntrack -E expect ? With debugfs, you can also enable a few pr_debug() in nf_conntrack_pptp.c, maybe they provide a hint. Can you see the GRE flow? I assume this is without the flowtable?