TomatoUSB

I have spent hours trying to get this to work, but I seem to be missing something.

I want dnsmasq to send the default gateway and dns server address of 192.168.0.55 to the host whose MAC address is xx:xx:xx:xx:xx. The host is on the same subnet as the default subnet the router serves (192.168.0.0/24).

So I added this to the DNSmasq custom config:

dhcp-mac=red,xx:xx:xx:xx:xx:xx

dhcp-option=red,3,192.168.0.55
dhcp-option=red,6,192.168.0.55

This almost works. When I look at the DHCP OFFER packet in Wireshark, dnsmasq is sending TWO default gateway (option 3) addresses, the 192.168.0.55 I specified above PLUS the router's 192.168.0.1 address. How can I prevent it from sending the router's IP as well? Some hosts on the network (tagged red) are using the 192.168.0.1 address as their default gateway and some are using the 192.168.0.55.

Can anyone help? Thanks in advance.

It used to work with tomato see, for example

http://www.linksysinfo.org/index.php?threads/assign-different-gateways-via-dhcp-based-upon-mac-address.22064/

Thank you for the reply. I'm actually aware of the post you mentioned, and I used it to create my config. The same problem exists though. 2 default gateways are sent to the hosts tagged red, not one! Any other ideas?

There seems to be some ambiguity in the docs re use of "set" or "net", but I wonder if your devices are also static reserved IPs through the Tomato gui so the mac address gets listed twice? Otherwise the dnsmasq author Simon Kelley is usually very supportive!

I thought about that, and I made sure they were not listed twice. :) I will email the dnsmasq discussion mailing list and hopefully Simon will see it. Thanks for that suggestion. If I find a solution I will post it here.

After discussing this with Simon Kelley, it turns out that dnsmasq is not the problem. The Tomato build I'm using (shibby build 100) creates the following lines in dnsmasq.conf (which I cannot modify):

interface=br0
dhcp-range=br0,192.168.0.100,192.168.0.120,255.255.255.0,60m
dhcp-option=br0,3,192.168.0.1    # <---- the problem is here

Since I cannot edit the "br0" out of the dhcp-option line, dnsmasq will send 2 default gateway addresses to the hosts tagged "red" (because the hosts tagged "red" are also tagged "br0" because they are part of the 192.168.0.0/24 subnet defined in bridge 0).

So ideally I would like tomato to do this instead:

dhcp-option=3,192.168.0.1

I checked tomatoRAF and it does not add the "br0" to the dhcp-option line but I do not want to switch from shibby's build. Is there any way to contact shibby and ask for a solution??

Thanks all.