Brad Fitzpatrick 85c3d17b3c wgengine/magicsock: use disco ping src as a candidate endpoint ...

Consider:

   Hard NAT (A) <---> Hard NAT w/ mapped port (B)

If A sends a packet to B's mapped port, A can disco ping B directly,
with low latency, without DERP.

But B couldn't establish a path back to A and needed to use DERP,
despite already logging about A's endpoint and adding a mapping to it
for other purposes (the wireguard conn.Endpoint lookup also needed
it).

This adds the tracking to discoEndpoint too so it'll be used for
finding a path back.

Fixes tailscale/corp#556

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

2020-08-12 21:33:43 -07:00

..

magicsock_test.go

wgengine,magicsock: fix two lazy wireguard config issues

2020-08-06 15:02:29 -07:00

magicsock.go

wgengine/magicsock: use disco ping src as a candidate endpoint

2020-08-12 21:33:43 -07:00