I don't know much about Networking, etc so maybe I'm "fishing with a Baseball bat", but you might wanna try these 2 distro's-
grml-Has more detection, etc software than KNOPPIX
Get the FULL version- "grml_2008.11.iso" or "grml64_2008.11.iso"
(
http://grml.org/features/ )
And INSERT inside security. Lots of Tools
(
http://www.inside-security.de/applicationlist.html )
Being that your trying to do this from USB-
There is a script and a wiki for putting grml on USB
SCRIPT- (
http://grml.org/scripts/grml2usb )
WIKI- (
http://wiki.grml.org/doku.php?id=usb )
And INSERT can install to USB from the LIVECD (60MB)
INSERT is also now included in UltimateBootCD
(
http://www.ultimatebootcd.com/ )
I believe UBCD can also install to USB from CD...
Others here can answer your specific questions-Just thought Distro's more suited to detection/security/rescue like those above are better than Sidux.