MikroTik change TTL (restrict other connected routers using time to live or hop limit)

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How to restrict a router in a network, and allow only the main router

wan = ether1
ttl = 1 (allow only 1st hop/router)
ttl = 2 (allow only 2nd hop/router)
ttl = 3 (allow only 3rd hop/router)
and so on...

script
/ip firewall mangle
add action=change-ttl chain=prerouting in-interface=ether1 new-ttl=set:1 passthrough=no
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great demonstration. thats help a lot and easy to understand.

baxi_SG
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would this affect ppoe clients using cpe antenna?
would i use 1 or 2 for TTL?

baxi_SG