Your router should be UPnP enabled. Some Linksys models, however, have some firmware issues & don't work well in UPnP mode. See tips about this under UPnP here:
http://www.gnutellaforums.com/showth...threadid=51357

in the worst case you might have to portforward:
http://www.portforward.com/english/r...outerindex.htm

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