On 10/22/2013 08:20 PM, Simon Kelley wrote:
On 22/10/13 17:17, Gui Iribarren wrote:
On 10/22/2013 05:45 PM, Simon Kelley wrote:
On 21/10/13 20:31, Gui Iribarren wrote:
Hello Simon!
Then, do you think there's any chance of getting that arp trick point to
'anygw'?
Yes, depending on the results of the dhcp-broadcast thing.
Indeed, setting dhcp-broadcast solved (workarounded?) the issue :D
i'll do some tcpdumps, and you mentioned you'd be interested in "arp"
output, anything else?
cheers!
i'll try dhcp-broadcast later today
what would be the downsides / cons of having dhcp-broadcast permanently
enabled? maybe some broken clients?
Just a bit more load on clients from the broadcasts. Unless your network
is HUGE, I doubt it's noticable.
Cheers,
Simon.
thanks a lot!
gui
For an unconfigured
client (ie doing DHCPDISCOVER) dnsmasq ends up knowing the MAC address
of the client and its IP address, but the client _doesn't_ know that IP
address, and so can't respond to a ARP request. To get round this,
dnsmasq populates the ARP table on the server directly with the IP
address, MAC address and interface. Then it send the OFFER packet to the
IP address and the kernel knows how to route it. I think that you
"interesting" setup may be confusing this process. In the second
instance, I suspect that the crucial thing that makes it work is not the
presence of a lease in the lease-file, but a correct ARP-table entry
from the previous activity.
Certainly, a few more experiments, and looking at the output of
arp -a
would be instructive.
Looking again - there are more clues:
### the OFFER it's sending is a funny mix:
### it is sent *from* br-lan MAC and IP (192.168.11.129)
That may be the MAC address thing I talked about, or it may be something
else. Another experiment: try setting
--dhcp-broadcast
and see what happens then.
Cheers,
Simon
Cheers,
Simon.
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