i'm working on some simple network management tool and it has a scanner that should display all active devices on the network and also show their os and its version.
at least i want to get windows and linux versions, but some other (like cisco ios) are also valuable.
i've looked into tcp/ip fingerprinting using ttl and window size, but it seems not very reliable and only detects whether it is windows of linux.
is it even possible?
p.s. i don't want to use some ready solutions like wmi or snmp
