Except that a Launch Daemon (like a Startup Item before it) suffers from two important problems in this regard:.If System Configuration redoes the network configuration, it will trash your route. You can combat that by making launchd run your Launch Daemon periodically, but you might still have to wait for that length of time for your route to be restored.Both Launch Daemons and Startup Items can run before some network interfaces are fully configured. In that case, you may not be able to make a route at that time, and might have to fall back to waiting for a periodic invocation of your Launch Daemon (or in the case of a Startup Item, perhaps for a cron job).I just posted what will hopefully be a better (i.e. More robust) solution on my website. I built an for it; there's also some source code, but I can't post the link on Server Fault as I don't have a high enough reputation yet to put more than one hyperlink per post.To use it, install the package (so far only tested on my laptop, but appears to work).

I have two LANS, each with their own OS X Server, that need to talk to each other through a low bandwidth, secure, dedicated connection. There are various ways to do this, but I opted for using a pair of EtherBridges, which are devices that bridge over a dialup modem connection.So, each server has three ethernet cards: one for the Internet (en0), one for the LAN (en1), and one for the bridging. Here’s the MAC address of R1, learned dynamically. Let’s turn this into a static entry: SW1(config)#mac address-table static 001d.a18b.36d0 vlan 1 interface fastEthernet 0/1. Use the mac address-table static command to create a static entry. Here’s what the MAC address table looks like now.

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It should install a Launch Daemon that starts the 'staticrouted' server process (you can check this in top; if it isn't running, it probably means I got the installer slightly wrong, but you should be able to start it using launchctl as usual).To create static routes, you use the 'staticroute' program (which you'll find in /usr/local/sbin).