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maybe you know a situation that is regular for me: when testing a new wireless network - if dhcp is misconfigured, dhcpcd would just have to timeout. though - thanks to zeroconf support - it uses to pick up some ip addresses instead, making debugging hard. so here is a trick to disable zeroconf support (so that dhcpcd will just timeout):
append
dhcp_opts = -L
to your /etc/sysconfig/network/default (or other) profile for the section of the wireless interface