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| author | Adam Ierymenko <adam.ierymenko@gmail.com> | 2016-03-03 13:52:27 -0800 |
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| committer | Adam Ierymenko <adam.ierymenko@gmail.com> | 2016-03-03 13:52:27 -0800 |
| commit | ba56a5b9d1fd7a9007cf29d467afee20ae4c4a63 (patch) | |
| tree | 07b90da68d92e44fa4c7ad27543cb02748bb8bf6 /ui | |
| parent | a27d8b2910932bb1c31eb8b0542266825eae0ba6 (diff) | |
| download | infinitytier-ba56a5b9d1fd7a9007cf29d467afee20ae4c4a63.tar.gz infinitytier-ba56a5b9d1fd7a9007cf29d467afee20ae4c4a63.zip | |
Another NAT-t improvement:
Many NATs revert to symmetric behavior from friendlier modes if they cannot
preserve ports. This can occur if there is, for example, more than one ZT
device behind the NAT using port 9993.
Others (Airport Extreme?) seem to have bugs in which they completely freak
out if more than one device tries to do a lot of mappings using the same
internal local port.
Mostly to fix the latter case and somewhat to fix the former, we introduce
a secondary port. ZeroTier now binds 9993 (or whatever port you specify)
plus another port computed deterministically from your ZeroTier address.
This port is used for new links 1/4 of the time.
This mostly addresses the second problem above and partly helps to address
the first.
If uPnP/NAT-PMP is enabled we also still open a tertiary port because some
routers freak out if NAT-t is attempted using the same port as uPnP.
All of this is IPv4 only of course. IPv6 is sane.
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