At my last position I used to use RDC to connect to desktops all over the continental US.
VPN on all the connections.
Going out on a bonded dual T1 to remote sites with varying connections including 768kb DSL lines and Comcast cable on the East Coast. 

Usually the only time I had issues (slowness, dropped connections) was when we knew the remote site ISP was having problems.

Just my experience.

--
==========
Todd Young

 -------------- Original message ----------------------
From: Damien DeZurik <ddezurik at yahoo.com>
> For what it's worth, I have not seen this problem.  For me, it is usually 
> rdesktop over a short-distance LAN type connection from RHEL/Fedora to 
> WinXP/2000Server and I can't recall being dropped frequently.  Occasionally, 
> across town to an office but, still, good connectivity and not a lot of dropped 
> connections.  
> 
> Out of curiosity, is a VPN involved during these dropped connections? If so, can 
> the VPN be taken out of the equation while still keeping the login credentials 
> secure across the network? May be worth a try.
> 
> Damien
> 
> ----- Original Message ----
> From: Randy Clarksean <rclark at lakesplus.com>
> To: tclug <tclug-list at mn-linux.org>
> Sent: Tuesday, March 6, 2007 1:10:54 PM
> Subject: [tclug-list] OT:  "line" options for terminal server connections
> 
> A good majority of my work day is spent working on a remote windows
> system via terminal server.  I mostly log in using rdesktop on Linux,
> but I often use Remote Desktop Connection w/in XP, or log in via a
> webpage using an Active X type app for the interface.
> 
> Issues:  The connection hangs often - some days more than others.  This
> can be very frustrating to say the least.  There are probably some
> latency issues, but there must be more than that though to cause me this
> many issues.
> 
> Are there issues going via the internet and can the connection just
> eventually get messed up - causing me to hang?  Or do I need a
> connection with very little if any lag?
> 
> Can I get a dedicated line that will get rid of the lag and be more
> reliable?  I am certain there are more people out there in this
> situation ... so ... I am hoping for some suggestions and insight.
> 
> Thanks in advance.
> Randy