DD-WRT Port Sniffing

I needed to spy on the network traffic a wireless device was sending through my DD-WRT router, but didn't want to setup a proxy server or a Linux router, or anything really complicated.

What I really wanted was to run wireshark on my DD-WRT router.

Well I got probably the next best thing: the ability to mirror all of the traffic to another PC where I could capture it with wireshark!

Basically it is two commands (one for traffic sourced from the target and one destined for the target):

iptables -t mangle -A POSTROUTING \
    -d [IP to spy on] \
    -j ROUTE –tee –gw [IP of wireshark]
iptables -t mangle -A PREROUTING \
    -s [IP to spy on] \
    -j ROUTE –tee –gw [IP of wireshark]

Check out this link for the source:
http://thatexplainsalot.com/blog/2010/11/use-wireshark-and-dd-wrt-router-firmware-to-imitate-port-monitoring-on-a-router-switch-port/

Compress THIS!

Occasionally I like to free up hard drive space and who better to help than Windows itself? That's why I use the Disk Cleanup tool.

Unfortunately, one of the ways that the Disk Cleanup tool likes to "free up space" is to compress all of your "old" files. This, of course, is a terrible idea.

Fortunately there's a way to disable it!

Simply delete:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\VolumeCaches\Compress old files