direct lan connection 2 PCs

Make sure you have dhcp enabled on both PCs, as it is the default in GentooPlayer. Before connecting PC2 directly to PC1, you need to connect it to the router and do all the configuration you usually do on PC-Player, player configuration, enabled software, ramsystem etc etc.

Once you have connected PC2 directly to PC1, a network will automatically be created between the 2 PCs, PC2 will no longer be reachable from other PCs but only from PC1, if you need to change settings on PC2 you will have to reconnect it, temporarily, back to the router.