Google isn't helping me find the documentation for /etc/sysconfig/network-scripts/* in F18. It brings me to F14's "Deployment Guide", and browsing TOCs for the F18 documentation doesn't find anything promising.
My old router, that was running DD-WRT firmware, bit the dust. The stock brand router that replaced it doesn't have the ability to send NTP for clients via DHCP. I'm trying to figure out if I had drop something into /etc/sysconfig/network-scripts/ifcfg-*, that'll have the effect of doing that.