connecting linux router to Cisco router

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http://forums.fedoraforum.org – Hello, as a learning project I am building a Fedora Linux PC router which will integrate with two other Cisco 1841 routers. I want to interconnect them via the serial interfaces of the Cisco routers . Cisco routers use WIC-1T or WIC-2T serial ports. Has anyone done this before ? If so, what sort of PCI card will I need to install in my Linux router box to enable this ? Do I need any sort of special cable ? Thanks for any advice. n.b the reason I want to connect the Linux and Cisco routers via serial is to simulate a real-world WAN link. That is why I am not using ethernet to connect t (HowTos)