I am attempting to wire Cat 6 for my NAS for file server/backups. I have taken on a project like this before (at a previous residence) but I have never seen this situation. The house is 2 story but has attic access from the 2nd floor. When I follow the existing Coax runs to the wall I cannot clearly access the top plate because there is a 2x4 about 4 inches or less from the wall. I shoved my camera phone back there to get a picture of the existing entry point but that also seems extremely narrow. Does anyone have experience with a home built like this? And how did you manage to overcome it?

The existing ethernet cable is going into a RJ11 jack on the 2nd floor

better view of how close the board is to the wall

Here is the shot I got from behind the board

The existing ethernet cable is going into a RJ11 jack on the 2nd floor

better view of how close the board is to the wall

Here is the shot I got from behind the board