Once upon a time, Tom Horsley horsley1953@gmail.com said:
My system at work seems to take a long time to start the network. I have this suspicion it is waiting for an IPv6 DHCP server to respond (which won't happen).
It looks like the F18 install writes out ifcfg-* files with "DHCPV6C=yes", which should probably not be set by default, especially since so few environments (even IPv6 environments) will have a IPv6 DHCP server. Comment out that line or set it to "no" and it should fix the slowdown.
I've filed this in Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=903907