acr...@gmail.com (Andy Ruhl) writes: >On Tue, Sep 25, 2018 at 8:49 AM David Young <dyo...@pobox.com> wrote: >> I added UDP encapsulation to gre(4) in NetBSD specifically to pierce NAT >> firewalls, however, I don't know if Linux also has a UDP encapsulation >> for GRE.
I haven't seen a Linux kernel implementation of RFC8086 (GRE in UDP), but there is the Multi-Path Tunnel project on github that implements it including the draft multipath extension for it. >This is off topic, but it was alluded to earlier: >I think it's possible for a router to forward an IP protocol inward >via NAT, such as GRE? Or am I mistaken? NAT sessions are usually only created dynamically for outgoing traffic and since GRE has no session boundaries it's likely to be timed out then. But a static NAT rule should be fine. But then, some NAT routers will just drop GRE. -- -- Michael van Elst Internet: mlel...@serpens.de "A potential Snark may lurk in every tree."