[jeg0522]

I'm currently using DD-WRT V24 VPN on a Linksys WRT54GL. The router's IP address is 192.168.0.200. How do I go about having the router provide DHCP leases that specify a gateway of 192.168.0.1 (the domain controller) rather than using the router's own address of 192.168.0.200 as the gateway?

[soulstace]

http://www.dd-wrt.com/wiki/index.php/DNSMasq_as_DHCP_server#Assign_an_alternate_Gateway

[jeg0522]

I did the following:

Added dhcp-option=3,192.168.0.1 to "Additional DHCPd Options".
Applied changes.
Deleted my laptop's current DHCP lease. A new lease was issued immediately.

Default Gateway still shows up as 192.168.0.200. I also tried the same in the "Additional DNSMasq Options" with no luck. Any recommendations?

[soulstace]

Did you renew the laptop's DHCP lease from the laptop itself?

This is to be used with DNSMasq. If you are using DHCPd, it might not work.

[jeg0522]

Yep, the laptop is a windows-based machine. ipconfig /release, ipconfig /renew results in the same gateway of 192.168.0.200.

Would I be better off disabling DHCPd and writing a dnsmasq.conf? That seems more daunting, of course, but it might be a more foolproof method?

I'll take a look at the DNSMasq settings again. If you know of anything else to check, please let me know and thanks so much.

[jeg0522]

I found the problem. There's this little checkbox in Setup > Basic, "Use DNSMasq for DHCP". I set up the dhcp-option=3,x.x.x.x parameter in the "Additional Options for DNSMasq", checked the "Use DNSMasq for DHCP" setting and boom. It's off to the races.

Thanks for pointing me in the right direction.

[fboender]

No matter what I tried, I could not get this to work on DD-WRT v24-sp2 mini. The alternative syntax, however, did work.

In the "Additional DNSMasq Options" input box, put:

[YoyoJones]

Just in case I ever need to find the same solution I will cross-post my solution here, as this post is the highest ranking result on Google.

My solution was a little different for my router TP-Link C9 - running SVN revision 26866. Here are the details - http://www.dd-wrt.com/phpBB2/viewtopic.php?p=966744#966744

Admin - please delete as you see fit.

[malbers15]

There appears to be a different way of doing things for alternate gateway assignment on newer builds:
https://www.dd-wrt.com/phpBB2/viewtopic.php?p=1128534#1128534


Either:
dhcp-option=br0,3,w.x.y.z
or
dhcp-option=br0,option:router,w.x.y.z


I am assuming br0 is the lan interface. I think the wiki needs to be updated or a bug logged because this no longer appears correct:
dhcp-option=lan,3,w.x.y.z
from:
https://www.dd-wrt.com/wiki/index.php/DNSMasq_as_DHCP_server#Assign_an_alternate_Gateway

[malbers15]

Wiki has been updated, please see the following post:
https://forum.dd-wrt.com/phpBB2/viewtopic.php?p=1128535#1128535