Mac OSX Route Mapping: Use LAN for specific Server and Wifi for other
When working with internal services through LAN, we have some problem that we cannot connect to the outside world which we normally connect by Wifi.
Scenario — Expect Result
When going to internal server e.g. the ip 10.200.10.20 use LAN
Otherwise go through Wi-fi
See the interface in my machine with ifconfig
en0 Wifi
en5 LAN
We will config this behavior with route command
Removing LAN default Gateway
Open System Preference > Network
Seeing the LAN tab.
- Fill the Red if it is required for your internal services.
- Remove the default gateway in Green
Adding gateway
sudo route -n add -host <target_host_ip> <gateway_ip>
// Example
sudo route -n add -host 10.200.10.20 10.175.30.40
Add interface
sudo route add -host 10.200.10.20 -interface en5
Seeing route
OSX version of route miss the command to see route.
It use netstat -nr instead.
netstat -nr
...10.200.10.20 10.175.30.40 UGHS en5
...
Now when going to 10.200.10.20 it goes through correct gateway and correct interface (LAN en5 )
and for other i.e. default goes through Wifi (en0)
default 172.24.200.1 UGSc en0
Bonus
For those with ip range, we can avoid tedious one by one adding with CIDR block range /16 , /24 etc.
sudo route -n add -net 172.16.0.0/16 192.168.1.49
Hope this help. Cheers !
