Mailinglist Archive: opensuse (783 mails)

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Re: [opensuse] No network of leap 42.3
On 10/09/2017 10:55 AM, jdd@xxxxxxxxx wrote:
Le 09/10/2017 à 16:29, Patrick Shanahan a écrit :

shouldn't the OP assign/reserve the machine an address in the router
config?

I don't know for wifi (because authentication), but on a threaded
network, a machine can run the IP it wants without advertising it, at
least at start. It can even be on the dhcp reserved part, and the
machine can work and go to internet. Of course the router know it as
soon as traffic is made on the net.

of course if an other machine have the same IP, there are problems.

It depends also of the router to store (or not) the IP not covered by
it's dhcp. simpler ones don't seems to care.


Actually, there's more to it than that. Duplicate Address Detection
(DAD) is often used now, to see if an address is in use. Even without
DAD, a device will often do a gratuitous ARP, to let other devices know
it's on the network. It will also ARP requests to determine the MAC
address for the gateway etc.. So, there are lots of things that
"advertise" an IP address by an interface that's starting up, even when
DHCP is not used.

Fire up Wireshark and filter on ARP, to see what actually happens.



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