203639c449
from DHCP in the event that no gateway is returned from DHCP, breaking the assumption that we skip the routing insertion of the gateway if the sin length is zero. Check also for s_addr of 0 to avoid the "Oh no, adding my default route failed" panic, making it possible to pxeboot machines on segments without default routes. Arguably this could be a bug in pxeboot, or in the TUNABLE code, but this makes my boxes boot.