nice howto with screenshots at cisco support forums
networking
atpitude install dhcp_probe
become root!
dhcp_probe -f -o /home/user/dhcp.pcap eth0
or search in vlans!
dhcp_probe -f -o /home/user/dhcp.pcap eth0 -Q <vlan-id>
works on maverick but not on natty? sound familiar? ubuntu screwed something up, but the solution is quite simple:
sudo add-apt-repository ppa:pmcenery/ppa
sudo aptitude update && sudo aptitude install gvfs ipheth-dkms ipheth-utils
works like a charm 
be sure to have “nat traversal” turned on!
google it with “intitle:index.of” in the end
if you’re trying to implement CA certificate so U can access your router via https, look at nicely explained article here. Make sure to load CA intermediate certificate (not root certificate!).
solution is quite simple – instead “show run” try “more system:running-config”
Nice table @ linux home networking