icmp messages

[Petre Bandac]

hello

I've googled around to find out EXACTLY what ping messages mean

like 
icmp: time exceeded in-transit [tos 0xc0] 

or

icmp: echo request [ttl 1]

first I went to check out rfc's, but didn't find much there

could you please give me any hints ?

thanks,

petre
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