Zerotier for Layer 2 Tunneling

[holvoetn]

Hi and welcome.
Why L2 ? For Romon connectivity ?

Then you need to add something to Zerotier flow rules.
Look here:

ZeroTier on Mikrotik – a rosetta stone [v7.1.1+]

ZeroTier on Mikrotik is only available for ARM/ARM64 architecture running RouterOS version 7.1+ This is biggest blocker to a lot useful use cases, since not all Mikrotik’s are ARM-based. You may not have to even read this! ZeroTier aims to be very simple. So IF you followed Mikrotik’s instruction AND know some networking/Mikrotik config already, SHOULD be easy. Now, it’s the intersection with other RouterOS features/protocols where there may be more trouble, and why I write this. But se…

@Amm0

So if just add the following to the TOP of the Flow Rules for the Network at my.zerotier.com. You’d still want the defaults, so LEAVE the rest

#
# Allow RoMON.
#
accept
	ethertype 0x88bf
;

There is some docs about the Flow Rules next to where you configure on ZeroTier’s Network config page. But way the flow rules work (& describe this):

• if action matches the criteria, rule evaluation stops (why we add an “accept ethertype 0x88bf;” at start and be done)
• the default action is deny (why the default includes a final “accept;” line) – so NO rules, means NO traffic
• if you use IP-based (Layer3) matchers, they are ignored for non-IP traffic (e.g. just “passthrough” to next rule)