[44net] Making Gateway with PI ? and TNC as well ?

Hi there Since yesterday I have a Raspberry Pi unit connected to Arduino doing MMDVM (a project that allow making digital repeater from two analog radios) I know that a Gateway can be done with raspberry Pi 1) What exactly needed to be done (some software to add to what i have now ?) in order to deal with IPIP and make a gateway ? can it run on RASPIAN ? 2) what about making TNC from Raspberry ? i know thare is a board that stick to it and make TNC ... Or (preferred) using the Internal sound card for making TNC ? can this be done on Raspian ? and where can i get info how to do it ? Thanks For any Info Regards Ronen - 4Z4ZQ http://www.ronen.org Ronen Pinchooks (4Z4ZQ) WebSite<http://www.ronen.org/> www.ronen.org ronen.org (Ronen Pinchooks (4Z4ZQ) WebSite) is hosted by domainavenue.com