Re: Can't see nmap traffic

["Kris Katterjohn" <katterjohn () gmail com>]

On Nov 9, 2007 5:36 AM, Walker JWalker <j_walker2 () hotmail com> wrote:
> When I scan my local network I can't see the traffic nmap generates.  I've tried both Windows XP SP2 and Backtrack 2 
> in VMWare, and both tcpdump and Wireshark both listening on the correct interface with no luck.  The only time I'm 
> able to see the packets is if I scan anything other than 192.168.1.0/24.
>
> K:\nmap-4.20>nmap -sP 192.168.1.65/26
>
> Starting Nmap 4.20 ( http://insecure.org ) at 2007-11-08 22:44 Eastern Standard
> Time
> Host 192.168.1.100 appears to be up.
> MAC Address: 00:00:C5:B5:94:8F (Farallon Computing/netopia)
> Host 192.168.1.101 appears to be up.
> Host 192.168.1.102 appears to be up.
> MAC Address: 00:0C:29:7C:C9:CB (VMware)
> Nmap finished: 64 IP addresses (3 hosts up) scanned in 2.328 seconds
>
> Mean while an ICMP filter on both Wireshark and tcpdump show no output.  Anyone know what could be wrong?  I really 
> need to get this fixed.

Did you always filter for ICMP?  When you're scanning a local LAN,
Nmap uses ARP packets for the ping scan as this is much more
efficient.

Thanks,
Kris Katterjohn

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