difference between DROPped pings and non existing hosts

Daniel Lopes lopsch at lopsch.com
Tue Apr 26 20:15:12 CEST 2005


Hi,


I would like to know how ICMP distinguishes between DROPped pings and 
non existing hosts. Both times you don´t get a reply from the 
destination host but if it doesn´t reply because it doesn´t exist you 
get the correct destination unreachable message if it drops the requests 
for example with IPTables you get a timeout. And I haven´t a clue why 
this is so.



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