[Gllug] arp problem?

[Adrian McMenamin]

On Sun, 2006-06-11 at 13:48 +0100, Casper Gasper wrote:
> On 11/06/06, Adrian McMenamin <adrian at mcmen.demon.co.uk> wrote:
> > On Sun, 2006-06-11 at 13:12 +0100, Casper Gasper wrote:
> > > > But the second box doesn't have an IP address, it just has a MAC
> > > > address. The box is booted with a very simple slave program which simply
> > > > loads loads the kernel into the right memory location and runs the
> > > > bootloader.
> > >
> > >  If it doesn't have an ip address, why are you attempting to ping it?
> > >
> >
> > Because the arp table ought to tell the kernel which MAC address to aim
> > for
> 
>   That won't work, I've thought that in the past but it doesn't.  The
> arp table entry will send the packets to the machine, but when say a
> ping packet goes through the TCP/IP stack, it will get discarded
> because the destination IP address doesn't match the local ip -- or
> else, forwarded if ip forwarding is enabled on the machine.
> 
It does work.

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