Tue, Jul 19, 2011 at 10:40:11AM +0300, Daniel Braniss wrote: > > And that non-broadcast ethernet address is the MAC of your > > default router? > yes.
Fine, that is more-or-less expected, since the network subsystem just routes 255.255.255.255 to the default gateway. The issue you're seeing were already seen before, http://lists.freebsd.org/pipermail/freebsd-net/2005-October/008626.html http://www.freebsd.org/cgi/query-pr.cgi?pr=72468 http://lists.freebsd.org/pipermail/freebsd-net/2007-January/012874.html [1] and bms@ told me that in this case the default gateway routing is the correct historical behaviour of FreeBSD. [1] I finally remembered that I had seen this issue too ;)) > > What's your routing table (netstat -rn) for the PXE-booted host? > > it's ok, same in both cases. it's picked up via DHCP, in the diskless > case by the boot/loader in the second via dhcpclient. Still, can you show both of them? > > You nailed it: you should send packets to the network's broadcast, > > not to the 0xffffffff. > > > but I'm at the user/ip level!, have no way to set mac/ethernet address. I meant the IP's network broadcast and by 0xffffffff I meant 255.255.255.255. Please, look at the posted code. > still, the question is why it works in one case, and failes in the other. Yes, it is. But ip_output.c has the following code, {{{ if (rte->rt_flags & RTF_GATEWAY) dst = (struct sockaddr_in *)rte->rt_gateway; if (rte->rt_flags & RTF_HOST) isbroadcast = (rte->rt_flags & RTF_BROADCAST); else isbroadcast = in_broadcast(dst->sin_addr, ifp); }}} So, if the route that is selected is the gateway, then there will be no broadcast on the L2. At least in my understanding of the code. Thus, I am interested in the routing tables and route flags. -- Eygene Ryabinkin ,,,^..^,,, [ Life's unfair - but root password helps! | codelabs.ru ] [ 82FE 06BC D497 C0DE 49EC 4FF0 16AF 9EAE 8152 ECFB | freebsd.org ]
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