What is netstat -r command used for?What does the different flags mean: MSS, window, etc

Question

What does the different flags mean: MSS, window, etc

Answer 1

From man netstat:

--route , -r
   Display  the kernel routing tables. See the description in route(8) for
   details.  netstat -r and route -e produce the same output.

From man 8 route:

MSS    Default  maximum  segment  size  for  TCP  connections over this
       route.

Window Default window size for TCP connections over this route.