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Recently zerotier stopped working properly unless I manually set MTU

Networking & Routing

For the past few weeks, Zerotier locks up when there is a large burst of traffic unless I manually set the MTU of the zt interface to a low value (e.g. 1300) first. This never happened before. Has something changed?

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What version of zerotier are you on? The quickest way is from the CLI: sudo zerotier-cli info (or no sudo on windows).

I'll forward this to the powers that be. Also, a github ticket or searching our github issues would be immensely helpful: https://github.com/zerotier/ZeroTierOne

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I see this issue - https://github.com/zerotier/ZeroTierOne/issues/975 - and a response that the default MTU is supposed to be 1432. But like the last person who responded, I'm seeing 2800 in reality.

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Version 1.6.6 Mac

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Hi, 1432 is a physical mtu. 2800 is the default for the virtual interfaces.

What kind of device is this happening on and what bandwidth? Are they single core VPS instances?

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It's a Mac (4-core processor) with gigabit ethernet to a 500mbps WAN link.

MTU of the actual ethernet interface is 1500.

When I run zerotier on a Linux VM under Virtualbox on this same Mac, it has the same problem.

I believe it all started with the upgrade to 1.6.6 though I can't pin it exactly.

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