Identifying operating system with ICMP/ping

ping host…

(try localhost)

Windows default TTL = 128
Linux default TTL = 64
Unix default TTL = 255

each hop (router) decreases the TTL by one. So if you get a 120 as TTL, its a windows machine, and your packet went through 8 routers.

1 thought on “Identifying operating system with ICMP/ping”

Rafael Aroca Post authorJune 15, 2010 at 8:21 am

To change this parameter:

# echo 1 > /proc/sys/net/ipv4/ip_default_ttl

# cat /proc/sys/net/ipv4/ip_default_ttl

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