[Dnsmasq-discuss] {Disarmed} Re: Restrict DHCP providing default gateway to *one* host on one network

Mogens Melander mogens at fumlersoft.dk
Sat Apr 20 10:18:34 BST 2013


Maybe something like this:

# Override the default route supplied by dnsmasq and send no default
# route at all. Note that this only works for the options sent by
# default (1, 3, 6, 12, 28) the same line will send a zero-length option
# for all other option numbers.
dhcp-option=vl20-ovsbr0,3

On Sat, April 20, 2013 06:10, Willard Dennis wrote:
> On reviewing the subject of my post, I think I should have used the word
> "Prevent" instead of "Restrict" - would have been clearer as to what I
> want to do...
>
> Will
>
> From: willarddennis at live.com
> To: dnsmasq-discuss at lists.thekelleys.org.uk
> Date: Fri, 19 Apr 2013 14:59:03 -0400
> Subject: [Dnsmasq-discuss] Restrict DHCP providing default gateway to
> *one*	host on one network
>
>
>
>
>
>
> Hi all,
>
>
>
> Trying to do something with dnsmasq that I believe is
> possible, but I cannot get it to work... First, please take a look at my
> topology
>
> diagram:
>
>
>
> http://s1096.photobucket.com/user/willdennis/media/testbed_topology_diagram.png.html
>
>
>
> My problem is with the "WANem VM" host. It is
> connected to the two LANs, and I want the "10-net" interface to get a
> specific IP assigned, as well as a default gateway (this is working.) The
> problem is, I want the other NIC to get an IP assigned (which is working),
> but,
> NO default gateway set for that NIC. So the state I want to end up with
> is:
>
> Eth0 ("10-net") -> specific IP address
> assigned, has default gateway set (same as all other hosts on that network
> that
> use DHCP)
>
> Eth1 ("20-net") -> pool IP address assigned,
> NO default gateway set (unlike the other hosts on this network that use
> DHCP,
> which all need a default gateway assigned)
>
>
>
> Right now, the eth1 on the WANem host IS getting a
> default gateway assigned, which leads to this host having two default
> paths
> out:
>
>
>
> Destination         Gateway                  Genmask             Flags
>  Metric   Ref     Use      Iface
>
>
>
> <netroutes redacted>
>
> 0.0.0.0                   192.168.10.254     0.0.0.0                   UG
>        0           0         0           eth0
>
> 0.0.0.0                   192.168.20.254     0.0.0.0                   UG
>        0           0         0           eth1
>
>
>
> This is causing a reachability problem with this host.
>
>
>
> Here are the active stanzas in dnsmasq.conf currently:
>
>
>
> 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=vl20-ovsbr0,3,192.168.20.254
>
> dhcp-option=net:wanem-20,3
>
>
>
> I'm sure it's a simple config change, but I cannot seem
> to figure it out... If someone could help me out here, I'd sure appreciate
> it...
>
>
>
> Thanks,
>
> Will
>
>
>
>
>
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-- 
Mogens Melander
+66 8701 33224

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