hosts found/not found based on number of IP addresses scanned

[Norbert Kiesel <nkiesel () tbdnetworks com>]

Hello,

I'm running nmap scans in my local network for IOS routers/switches  and
based on the IP address ranges specified, some machines are detected or
not detected.  I keep all other parameters identical.  I also tried to
specify e.g. --min-hostgroup and --minimal-rtt-timeout, but nothing
seems to really do the trick.

# nmap -P0 -PU161 -PS22,23 -p T:22,23,U:161 -sT -sU 192.168.4.240-255

Starting Nmap 4.20 ( http://insecure.org ) at 2007-06-06 19:41 PDT
Nmap finished: 16 IP addresses (0 hosts up) scanned in 0.445 seconds

# nmap -P0 -PU161 -PS22,23 -p T:22,23,U:161 -sT -sU 192.168.4.250-255

Starting Nmap 4.20 ( http://insecure.org ) at 2007-06-06 19:41 PDT
Interesting ports on 192.168.4.252:
PORT    STATE         SERVICE
22/tcp  closed        ssh
23/tcp  open          telnet
161/udp open|filtered snmp
MAC Address: 00:10:7B:E8:5C:25 (Cisco Systems)

Nmap finished: 6 IP addresses (1 host up) scanned in 0.694 seconds

nmap is running on Linux 2.6.21.3 x86 (Debian unstable), but I got the
same results with Nmap 4.11 on Linux 2.6.18-4 amd64 (Debian stable)

Best,
  Norbert

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