Guys i m v new to this......i want the copy of cisco SDM is it free...??? i went to cisco website an dserached for it there are like 10's of them which one shd i download (if its free) and guys i have 2811 router will it fits on that do i have to downlaod an appropriate IOS as well inorder it to work......secondly if i have anotehr router 2600 on th eotehr end can i still configure GRE and VPn' on my cisco 2811??? really confused.....need help plz