[Dnsmasq-discuss] ARP ignores DHCP ACKs !
nikitan at operamail.com
Tue Dec 24 19:17:00 GMT 2013
Hi all :) thanks for sharing :)
I DO have no-ping in my dnsmasq.conf
I dont run on Apple, but I also see a duplicate DHCP requests from the
client.. it keeps asking "Who has 192.168.0.10? Tell 0.0.0.0" many
times, then requests another DHCP.. DHCP answers again ACK, but after
client again keeps asking "Who has 192.168.0.10? Tell 0.0.0.0" ..
.. finally client sends a shot of NetBios frames, LLMNR and IGMP using
the ip (192.168.0.10, so looks like client got the ip right indeed..),
stop.. nothing else.. no other frames, no DNS reqs.. client gives up,
just puts a red X on the connection icon, stop.. :(
On Tue, Dec 24, 2013, at 10:16 AM, Jim Alles wrote:
> This may have nothing to do with your issue, but there seems to be
> something goofy with Apple. An IOS client seems to have to try a
> second time to get its IP address on my BYOD network. My guess it is a
> time-out issue.
> I have not tried --no-ping on dnsmasq.
> Jim A.
> On Tue, Dec 24, 2013 at 9:55 AM, Matthias Andree <matthias.andree at gmx.de>
> > Am 24.12.2013 13:35, schrieb Nikita N.:
> >> Hi :) Im having a strange issue here with DHCP/ARP I cant solve..
> >> DHCP works good, it receives a REQ from client MAC asking the preferred
> >> ip, e.g. 192.168.0.10, and DHCP answers correctly ACK..
> >> But after that, my client keeps asking the following ARP requests to
> >> broadcast: "Who has 192.168.0.10? Tell 0.0.0.0" .. it expects the answer
> >> like "192.168.0.10 is at XX.XX.XX.XX.XX", where XX is the client MAC..
> >> but it never comes :(
> > Perhaps it is running duplicate address detection to make sure nobody is
> > using the address, before it grabs it? Or the DHCP responses do not
> > make it for the client, or the client drops them on the floor.
> >> It looks like dnsmasq does NOT inform the system ARP about the client ip
> >> it just ACKed, resulting always in connection error/absent ..
> > Nor should it.
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