Unable to get DHCP Lease when Bridged

[hebo]

Hey guys,

I've been having trouble setting up my router (running Tomato) behind the modem (Pace). When setting the modem to bridged mode, my router is unable to get a DHCP lease. Oddly, the computer behind the router is able to get a lease for a public IP, even when the router is set up to give DHCP leases--as though the upstream server is overriding the router DHCP server.

I've switched out routers to rule out a hardware issue and have tried resetting both routers and the modem. I get the same behavior when using the "LAN Subports" mode as well.

Setup Screenshots:
Modem: http://cl.ly/image/132c2s0N3z3y
Tomato config: http://cl.ly/image/38070R3j3c0I
Tomato Status: http://cl.ly/image/2E38061i2k1q

[hebo]

Hey guys,

I've been having trouble setting up my router (running Tomato) behind the modem (Pace). When setting the modem to bridged mode, my router is unable to get a DHCP lease. Oddly, the computer behind the router is able to get a lease for a public IP, even when the router is set up to give DHCP leases--as though the upstream server is overriding the router DHCP server.

I've switched out routers to rule out a hardware issue and have tried resetting both routers and the modem. I get the same behavior when using the "LAN Subports" mode as well.

Setup Screenshots:
Modem: http://cl.ly/image/132c2s0N3z3y
Tomato config: http://cl.ly/image/38070R3j3c0I
Tomato Status: http://cl.ly/image/2E38061i2k1q

EDIT:

Checked router logs, presumably is related to these dnsmasq notices:

Code: Select all

Dec 31 23:39:20 unknown daemon.info dnsmasq-dhcp[3683]: DHCPDISCOVER(br0) e4:ce:8f:42:3a:aa 
Dec 31 23:39:20 unknown daemon.info dnsmasq-dhcp[3683]: DHCPOFFER(br0) 192.168.1.104 e4:ce:8f:42:3a:aa 
Dec 31 23:39:21 unknown daemon.info dnsmasq-dhcp[3683]: DHCPREQUEST(br0) 70.36.197.124 e4:ce:8f:42:3a:aa 
Dec 31 23:39:21 unknown daemon.info dnsmasq-dhcp[3683]: DHCPNAK(br0) 70.36.197.124 e4:ce:8f:42:3a:aa wrong server-ID

EDIT2:

And the DHCP client is unable to get a lease for some reason:

Code: Select all

Dec 31 22:07:39 unknown daemon.info udhcpc[896]: udhcpc (v1.18.5) started
Dec 31 22:07:39 unknown daemon.info udhcpc[896]: Sending discover...
Dec 31 22:07:42 unknown daemon.info udhcpc[896]: Sending discover...
Dec 31 22:07:45 unknown daemon.info udhcpc[896]: Sending discover...
Dec 31 22:07:54 unknown daemon.info udhcpc[896]: No lease, forking to background

[hebo]

Turns out I had the modem plugged into the LAN port instead of the WAN port, whoops!