[Dnsmasq-discuss] ARP ignores DHCP ACKs !

Matthias Andree matthias.andree at gmx.de
Tue Dec 24 14:55:35 GMT 2013


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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