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interface addresses and netmasks.
Before, route_dst worked like this:
1) Check destination address against all interfaces, with special-case
handling for local addresses.
2) Check destination address against routing table.
Now it works like this:
1) Check destination address against local addresses.
2) Check destination address against routing table.
3) Check destination address against all interfaces.
This allows a routing table entry to override an interface, for example
in this configuration:
************************INTERFACES************************
DEV (SHORT) IP/MASK TYPE UP MAC
eth0 (eth0) 192.168.0.21/24 ethernet up 00:00:00:00:00:00
**************************ROUTES**************************
DST/MASK DEV GATEWAY
192.168.0.3/32 eth0 192.168.0.1
192.168.0.0/24 eth0
192.168.0.3 will not be considered directly connected, but will have its
traffic routed through 192.168.0.1.
The logic for determining when an address is directly connected has
changed. Instead of considering an address directly connected whenever
it matches an interface netmask, we consider it so when the gateway
address is 0.0.0.0 or when the gateway address is exactly equal to the
interface address. The proper way to do this would be to look at the "G"
flag from the routing table, but libdnet doesn't retain that.
Here is some documentation for Nmap, but these files are much less comprehensive than what you'll find at the actual Nmap documentation site ( http://nmap.org ).