OpenVPN with MacOS X Client and same subnets in local and remote net.
- by Daniel
I have a homenetwork 192.168.1.0/24 with gteway 192.168.1.1 and a remote network with the same parameters. Now I want to create a OpenVPN tunnel between those networks.
I have no problems with Windows, because Windows routes everything to 192.168.1.0/24 except 192.168.1.1 throught the tunnel.
On MacOS X however I see the folling line in the Details window:
2010-05-10 09:13:01 WARNING: potential route subnet conflict between local LAN [192.168.1.0/255.255.255.0] and remote VPN [192.168.1.0/255.255.255.0]
When I list the routes I get the following:
Internet:
Destination Gateway Flags Refs Use Netif Expire
default 192.168.1.1 UGSc 13 3 en1
127 localhost UCS 0 0 lo0
localhost localhost UH 12 3589 lo0
169.254 link#5 UCS 0 0 en1
192.168.1 link#5 UCS 1 0 en1
192.168.1.1 0:1e:e5:f4:ec:7f UHLW 13 17 en1 1103
192.168.1.101 localhost UHS 0 0 lo0
192.168.6 192.168.6.5 UGSc 0 0 tun0
192.168.6.5 192.168.6.6 UH 1 0 tun0
My Interfaces are
en1 - My local Wifi network
tun0 - The tunnel interface
As can be seen from the routes above there is no entry for 192.168.1.0/24 that routes the traffic through the tunnel interface.
When I manually route a single IP like 192.168.1.16 over the tunnel gateway 192.168.6.6, this works.
Q: How do I set up my routes in MacOS X for the same behaviour as on windows, to route everything except 192.168.1.1 through the tunnel, but leave the default gateway to be my local 192.168.1.1 ?
