Most likely (but you should _ask_ the people who are bringing in the line), you will get a csu/dsu and an IP router from the company supplying the line. In this case, simply get an ethernet card for your linux box.
If it's isdn, see if you can get an isdn <--> ethernet box, which you should put a firewall on, the other port of which is the "inside" of your net. Overall, take a look at Olaf's Network Administrators' Guide, the Ethernet Howto, the ISDN Howto and the Hardware Compatibility (as well as INcompatibility) Lists. You'll find all these resources within reach of http://sunsite.unc.edu/ Good luck... -Jim -- TO UNSUBSCRIBE FROM THIS MAILING LIST: e-mail the word "unsubscribe" to [EMAIL PROTECTED] . Trouble? e-mail to [EMAIL PROTECTED] .