You need to check yer network config, d1rX explanation is how it sounds like your configured. If yer goin' through a linksys router, your two pcs should be configured to use dhcp and get ips for yer lan from the router and the gateway for each pc should resolve to the ip of the linksys router. If yer having probs w/ that trying assigning the gateway by specifing the ip.
primary MBP Core i5 2010 | HR | OCZ 120GB SSD
gaming Core i5-2500K @ 4.1GHz w/ CM Hyper212+ | MSI N560GTX-Ti TF II/OC | MSI P67A-GD55 | Silverstone FT02 | X360 250GB + Kinect
htpc IONITX-A-U | 2GB | M350 | XBMC Linux | SABnzbd, sickbeard, couchpotato | NAS Synology DS411J | 4TB
hometheater KURO PDP-5020 | Marantz SR6005 | Definitive BP7001s, CLR3000, BPVXPs