when ping -b *.*.*.255, only those machine within the same subnet will
response, and a new entry for each of these machine will be in the arp
table.
On Thu, 22 Jun 2000, Hariharan L Thantry wrote:
>
> Hi,
>
> Isn't that address(255.255.255.255) supposed to be some special broadcast
> address? I forgot for what purpose...I think it was for DNS..
>
> Regards
> Hari
>
> On Thu, 22 Jun 2000, Tony Nugent wrote:
>
> > On Wed Jun 21 2000 at 09:25, Scott Long wrote:
> >
> > > Jim Treadway wrote:
> > > > Unfortunately, it appears that a broadcast ping does not add an entry to
> > > > the ARP cache. Is this by design? Just curious...
> > >
> > > Yes, broadcast ping (in fact, any sort of IP broadcast) is implemented
> > > using ethernet broadcast packets and therefore no arp lookup is
> > > necessary.
> >
> > Strange. I can do:
> >
> > ping -b 255.255.255.255
> >
> > after which I do:
> >
> > cat /proc/net/arp
> >
> > and find a big bunch of new entries in the kernel's arp table.
> >
that may not caused by ping -b ... they may already there before...
> > Cheers
> > Tony
> > -
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