Classless Internet Domain Routing

[justa20fan]

I have an Untangle firewall with 6 interfaces. One of these is designated strictly for Ruckus Wireless.

Interface IPs
192.168.0.1 Internal (DNS)
192.168.1.1 eth6
192.168.2.1 eht7 (wireless Ruckus)
192.168.3.1 eth8
192.168.4.1 eth9

I have my DHCP scope defined to correctly give out 192.168.2.x addresses on eth6

Problem: Only Android users running Gingerbread 2.3.x cannot pull the correct DHCP information preventing these users from browsing the internet. All other devices, Mac, Windows, iOS, Android 4.0 ICS have no issues and do receive the correct IP information.

Fact: Gingerbread devices 2.3.x can connect to the network, get an IP from the defined address pool, but the Gateway is incorrect and the DNS server is incorrect. They cannot surf the internet. These devices get an IP = 192.168.2.x, GW = 192.168.0.1 and DNS = 192.168.2.1 (They should be getting GW = 192.168.2.1 and DNS = 192.168.0.1)

Fact: If I statically assign IP = 192.168.2.x, GW = 192.168.2.1 and DNS = 192.168.0.1 to an Android 2.3.x device, I can connect to the network and surf the internet

Fact: All other devices get an IP = 192.168.2.x, GW = 192.168.2.1 and DNS = 192.168.0.1 (this works correctly as it should) and the users can surf the internet

I have tried adding DCHP option 121 to properly route any classless devices to GW 192.168.2.1 using the following entry:
dhcp-option=121 24,192,168,2,192,168,2,1

How can I force the DHCP server to assign GW = 192.168.2.1 and DNS = 192.168.0.1 to these devices on the 192.168.2.x network?

[bhackbarth]

I have tried adding DCHP option 121 to properly route any classless devices to GW 192.168.2.1 using the following entry:
dhcp-option=121 24,192,168,2,192,168,2,1

Check your syntax. Syntax-wise what you should have there is:
dhcp-option=121,24.192.168.2,192.168.2.1

Function-wise, I believe you're supposed to specify a subnet, then an IP address to route it to. Like this:
dhcp-option=121,24.192.168.0/24,192.168.2.1

[justa20fan]

I have seen the syntax a couple of different ways both using commas and periods. What is the correct entry format?

[justa20fan]

And is it option 121 or 249 where you specify the GW IP for a particular subnet?

[dmorris]

Using commas definitely won't work.
You can read all you could ever desire about dnsmasq options here:
http://www.thekelleys.org.uk/dnsmasq...smasq-man.html

You can get some pretty good examples by googling "dnsmasq option 121" that should work in your case as well. Even though they are for different platforms (like ddwrt) they still use dnsmasq.

[justa20fan]

Great, so can you tell me the exact syntax to use to try to accomplish what it is I am trying to accomplish?

[justa20fan]

So in reading a bit, my entry should read as follows:

dhcp-option=121,192.168.2.0/24,192.168.2.1

[bhackbarth]

That syntax is correct.

Your current entry literally means "Push a static route out to DHCP clients. When the destination network is 192.168.2.0 255.255.255.0, the next hop is 192.168.2.1 to get there".

In my example I used /24 as an assumption that the subnet mask on was 255.255.255.0. If it is not make sure you update that.

[dmorris]

So in reading a bit, my entry should read as follows:

dhcp-option=121,192.168.2.0/24,192.168.2.1

I'm not sure, but that definitely looks better than what you had before.
I'd give it a try.

[IPexpress]

Thats the correct syntax