Game on LAN (Portal 2)

In order to play co-op over lan:

1) Log in on both computers and Enable developer console in the options..

2) Press ` to open the console. Write ... sv_lan 1.

3) the Client should connect first as the connection is interrupted, if the Host is in the empty game for a few seconds, but the client can wait indefinitely.
Client: Type into the console... connect replacing <> with the IP.
For example... connect 192.168.1.3

4) Next, the host selects a map by typing in console... mp_coop_ replacing <> with the name of the desired card.
For example... map mp_coop_start

5) the Host will connect, and when the client will see that the blue bar filled, you can start the game.

The map list:
mp_coop_start
mp_coop_lobby_2
mp_coop_doors
mp_coop_race_2
mp_coop_laser_2
mp_coop_rat_maze
mp_coop_laser_crusher
mp_coop_teambts
mp_coop_fling_3
mp_coop_infinifling_train
mp_coop_come_along
mp_coop_fling_1
mp_coop_catapult_1
mp_coop_multifling_1
mp_coop_fling_crushers
mp_coop_fan
mp_coop_wall_intro
mp_coop_wall_2
mp_coop_catapult_wall_intro
mp_coop_wall_block
mp_coop_catapult_2
mp_coop_turret_walls
mp_coop_turret_ball
mp_coop_wall_5
mp_coop_tbeam_redirect
mp_coop_tbeam_drill
mp_coop_tbeam_catch_grind_1
mp_coop_tbeam_laser_1
mp_coop_tbeam_polarity
mp_coop_tbeam_polarity2
mp_coop_tbeam_polarity3
mp_coop_tbeam_maze
mp_coop_tbeam_end
mp_coop_paint_come_along
mp_coop_paint_redirect
mp_coop_paint_bridge
mp_coop_paint_walljumps
mp_coop_paint_speed_fling
mp_coop_paint_red_racer
mp_coop_paint_speed_catch
mp_coop_paint_longjump_intro
mp_coop_credits

The name of the current map can be seen after it has loaded (in order to then be able to continue), but all earned actions will be lost. Note that you can be redirected to mp_coop_lobby_2. In this case, you just have to restart the process to the next level.