Nmap Development: nmap quits from scanning some IPs

["Ganga Bhavani" <GBhavani () everdreamcorp com>]

I'm running nmap 3.75 on windows xp sp2 and windows nt 4.

 In both the hosts, nmap quits executing with an error that can be traced to similar root cause. In both cases it 
doesnt find routing interface when it was trying to query local subnet or it's own interface. In such case even if 
there are other hosts to scan it quits that whole scanning process.

Problem 1:
 In case of windows xp sp2,  nmap finds the routing interface of ip address 192.168.1.0 as 0.0.0.0 instead of 
192.168.1.84 from the routing table.  I am not sure if it is a problem in the implementation of wsaioctl( ) or the 
nmap. 
Can some one please let me know in what conditions this 0.0.0.0 shows up as routing interface address. 

  The ip address of the local host that was scanning: 192.168.1.84. Executing nmap -O 192.168.1.0/24 just quits. Here 
is the message what I get. 
----------------------------------------------------------------------------------------------------------------------
nmap -O -debug -debug -debug -debug 192.168.191.0/24
***WinIP***  winpcap is present
***WinIP***  rawsock is available

Starting nmap 3.75 ( http://www.insecure.org/nmap ) at 2004-10-22 14:24 Pacific
Daylight Time
Fetchfile found C:\nmap/nmap-services

The max # of sockets we are using is: 0
routethrough: 192.168.191.0 routes through 0.0.0.0, but inaddr2devname failed
Unable to determine what interface to route packets through to 192.168.191.0
QUITTING!
------------------------------------------------------------------------------------------------------------------------

C:\Documents and Settings\Administrator>route print 192.168.*
===========================================================================
Interface List
0x1 ........................... MS TCP Loopback interface
0x10003 ...00 d0 b7 1f 14 fd ...... Intel(R) PRO/100+ Management Adapter - Packet Scheduler Miniport
===========================================================================
===========================================================================
Active Routes:
Network Destination        Netmask          Gateway       Interface  Metric
      192.168.191.0    255.255.255.0     192.168.191.84    192.168.191.84       20
     192.168.191.84  255.255.255.255        127.0.0.1       127.0.0.1       20
Default Gateway:       192.168.191.1
===========================================================================
Persistent Routes:
  None

Problem 2: 
Similarly incase of windows nt4. If scanning is done on say 192.168.191.0/24 and if the IP address of the local 
host(192.168.191.195) is as part of the scanned host , nmap just quits from scanning. This may happen because of pcap 
not work for the local host.  Shouldn't nmap proceed with other nodes and not quit  if there are such errors ?

Starting nmap 3.75 ( http://www.insecure.org/nmap ) at 2004-10-22 13:38 Pacific
Daylight Time
Fetchfile found C:\nmap/nmap-services

The max # of sockets we are using is: 0
The first host is 192, and the last one is 192
The first host is 168, and the last one is 168
The first host is 191, and the last one is 191
The first host is 95, and the last one is 95
doing 0.0.0.0 = 192.168.191.95
get_best_route: using NT4-compatible method
Unable to determine what interface to route packets through to 192.168.191.95
QUITTING!

Thanks,
Ganga