How to change the screen resolution?
I type the command
rdesktop "server ip"
but the screen does not appear large.
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I'd suggest that you consider a graphical tool such as Remmina (used to be called GRDC) : http://remmina.sourceforge.net/, which is available in the repositories.
sudo apt-get install remmina remmina-plugin-rdp remmina-plugin-vnc
It features easy to use drop downs and sliders for remote screen resolution, supporting multiple monitors and more.
It also supports VNC and SSH tunnelling, making it a one-stop-shop for all your most likely remote desktop connection needs. Finally, a handy gnome-panel applet makes connecting to your remote desktops a simple point and click experience.
Screenshots here : http://remmina.sourceforge.net/screenshots.shtml