Apple OS X - command line network commands

How to show the routing table:

netstat -nr

How to add a route:

sudo route -n add [ip address]/[subnet] [gateway]

e.g.

$ sudo route -n add 10.0.0.0/24 172.16.0.1

List open files (Determine what target IP and application/process is connected to)

$ lsof -i

e.g. To determine what IP a Citrix session is connecting to:

$ lsof -i | grep -E "Citrix"

How to set MTU on Linux interface

The MTU can be set with:

$ sudo ip link set dev tun0 mtu 1350

It can be tested with

$ ip a s 

And will show something like the below:

5: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1350 qdisc pfifo_fast state UNKNOWN group default qlen 100

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