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what is ttl and why there is difference when pinging different devices in same lan

Last Modified: 2020-10-18
just a general question
when I try to ping my router from a local computer which is connected with lan cable- ping time is ms<1, ttl is 255
when I ping my server in same lan:
ping time is <1, but ttl is 128

why there is vary in ttl when I ping my sever and router from same local computer . anything I need to worry ??
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