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Updated The NAT Router House of Pain (markdown)

Adam Ierymenko
2015-09-23 15:48:10 -07:00
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The-NAT-Router-House-of-Pain.md
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This page is used to track workarounds and weird hacks that have been added to the ZeroTier code base to deal with broken, restrictive, or otherwise sketchy NATs, routers, firewalls, and other network hardware.
## Confirmed Cases
***
### Crappy apartment NAT ignores zero-byte keepalives
@@ -21,9 +20,10 @@ Ubiquiti Networks Edge Router Lite (ERLite-3, firmware 1.6.0) appears to have at
**2015-09-23 1.0.6-dev**: OneService now creates a second random UDP socket if UPnP/NAT-PMP port mapping is enabled and uses this socket for that purpose, leaving the regular port for normal non-mapped operation. Thus uPnP/NAT-PMP will not map to the same port as normal traffic.
## Unconfirmed Reports
***
## Unconfirmed Reports
### Multiple devices using same port
I've heard casual reports of crap NATs that choke if more than one device behind them is trying to talk UDP from the same local port (e.g. multiple ZeroTier nodes all using 9993). So far I can't confirm or find a confirmed test case for this.