On 24/04/13 15:52, Will Dennis (Live.com) wrote:
OK, this works - thanks TJ& Simon!
So as I understand it, the line:
dhcp-option=tag:vl20-ovsbr0,tag:wanem-20,3
means: for the machines tagged "vl20-ovsbr0" (which includes the WANem
machine's 2nd NIC), just use whatever the default option would be for the
router; but on machines tagged "wanem-20" (which matches ONLY the WANem
machine's 2nd NIC), set a NULL router option.
Correct? And, does order of application matter, or how else does dnsmasq
resolve the two options that match for the WANem VM's 2nd NIC?
dhcp-option=tag:vl20-ovsbr0,tag:wanem-20,3
says, send an empty option 3 for hosts when vl20-ovsbr0 AND wanem-20 are
set. What you should have is
dhcp-option=tag:vl20-ovsbr0,tag:!wanem-20,3
which says send an empty option 3 for hosts when vl20-ovsbr0 is set AND
wanem-20 is NOT set.
Since option 3 is in the set of options which dnsmasq sends by default,
the meaning of "send an empty option 3" is subtly altered to "don't send
option 3"
Cheers,
Simon.
Thanks again to everyone for their help in this!
Best,
Will
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Simon
Kelley
Sent: Wednesday, April 24, 2013 5:01 AM
To: [email protected]
Subject: Re: [Dnsmasq-discuss] Restrict DHCP providing default gateway to
*one* host on one network
On 24/04/13 08:58, TJ wrote:
On 23/04/13 15:33, Will Dennis (Live.com) wrote:
interface=vl10-ovsbr0
interface=vl20-ovsbr0
bind-interfaces
dhcp-range=vl10-ovsbr0,192.168.10.50,192.168.10.150,4h
dhcp-range=vl20-ovsbr0,192.168.20.50,192.168.20.150,4h
dhcp-host=52:54:00:d5:ee:4d,id:*,192.168.10.1
dhcp-mac=set:wanem-20,52:54:00:45:8c:6a
dhcp-option=vl10-ovsbr0,3,192.168.10.254
dhcp-option=tag:vl20-ovsbr0,tag:!wanem-20,3,192.168.20.254
log-dhcp
I may be mis-reading the manual but as I understood it dnsmasq will
issue a default set of options for each range.
dhcp-range=vl20-ovsbr0 will get a default option 3 which will be the
IP of the host running dnsmasq
dhcp-mac=set:wanem-20 sets a tag for the exceptional client
dhcp-option=tag:vl20-ovsbr0,tag:!wanem-20 will set a (possibly different)
gateway for non-exceptional clients.
At this point the exceptional client will have the default option 3 for
the range. I think what you need is to not send any default route at all
when the exceptional client makes a request:
dhcp-option=tag:vl20-ovsbr0,tag:wanem-20,3
I concur. Will, you've just omitted the empty option 3 from the last
dhcp-option.
(Wanders off to teach dnsmasq to complain in this situation.......)
Cheers,
Simon.
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