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FLAPPING IP LINK BETWEEN TWO NODES

Community SupportmacOS
networking

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Sep 2023
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Sep 2023

Oct 2023

mathieu
Sep 2023


Hi,
Iā€™m using ZeroTier to connect from a Mac M.2 to a Ubuntu 20.04 computer.
Everything was working fine until a few days. Since two days the connection goes
up and down every few minutes (constant flapping behavior), which is making it
hard to work with. We can confirm this behavior by pinging from Mac to Ubuntu
and vice versa with their respective ZeroTier IP: both ends are losing their ZT
link at the same time (only towards each other) while maintaining their
connection to the internet.
After taking a few tcpdumps, I noticed that the ping issue occurs when the ZT
server destination address switches (UDP packets address). This address seems to
be toggling between the two following IP:
104.194.8.134 UDP ports 55671 ā†’ 9993 (ZT link working)
103.195.103.66 UDP ports 9993 ā†’ 9993 (ZT link not working)
Maybe there is some issue with the 2nd ZT server (103.195.103.66)?
Please let me know how I can troubleshoot this further.




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Closed on Oct 22, 2023



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