How can I set up source IP routing

This is on a recent Macbook Pro, OSX 10.8 Mountain Lion. Maybe the question really belongs in a "networking" or "operating system" subforum.
A Linux example is:
ip rule add priority 32700 from 10.45.37.70 table 240
ip route add default via 10.45.37.69 table 240
ip route flush cache
It routes all packets with source address 10.45.37.70 via 10.45.37.69 as default gateway, regardless of destination address.
Why is this needed? --->
I have a few physically tiny Wifi routers. They can only act as NAT routers, and even block connections between internally connected devices. No problem, if I need a device to act as a server (VNC, sendmail, samba, webserver...) I set up a vtun (actually any VPN would do) between the device and a VPN server on my LAN. This way, the device gets an IP address that is reachable from my entire LAN. I can walk away and access the laptop from a smartphone, for example. And I can move data between 2 laptops while on wlan.
Outgoing connections should continue to use the normal wlan gateway. If everything would use the vtun gateway, that would cause a lot of unnecessary load on the server.
The source IP routing affects only reply packets to connections that come in via vtun VPN. The replies have the above mentioned source address that triggers the special routing. Without the special routing, the replies would be mangled by the NAT router.
I have, on a different VPN (lets call it "VPN2"), seen an alternative. This different VPN sets an additional default address, and according to a forum post I found, related to Snow Leopard, this would automatically select the best route based on source address and local links. This does not work well for me in the case of my VPN2 (everything goes down VPN2, it shouldn't), but maybe it will help in the vtun problem? Are multiple default gateways ordered in some way that affects routing?

Yes, you can SPAN multiple ports, or multiple VLANs. This will SPAN ports 5/1 through 5/5. The spaces on either side of the dash are necessary.
monitor session 1 source interface fastethernet 5/1 - 5/5
http://www.cisco.com/en/US/products/hw/switches/ps4324/products_configuration_guide_chapter09186a008023401a.html
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