ESR 9850 + 7750 home network trouble

[dillius]

I recently decided to replace my home router and expand my home network a bit by adding on another to expand my wireless coverage a bit.

First item introduced to the system was an ESR 9850, which has been working fine mainly as a LAN gigabit router with a few wireless devices on it. I have had no trouble with it for more than a week.

Now I am trying to introduce the 7750 into the mix but I absolutely can not get the 9850 to DHCP assign to computers attached to the 7750.

My Home network is as follows:

SMB Cable Modem that simply bridges one of my external IP's to the 9850
Subnet on the 9850 (10.0.0.1)
Reserved range 10.0.0.2-10.0.0.99 for static IP systems (Servers, wired machines)
10.0.0.100-10.0.0.240 are assigned for DHCP use
I intend to use 10.0.0.241-10.0.0.254 for other networking devices, such as the 7750.

I have been attempting to disable NAT and DHCP to have the 7750 act simply as an access point. I have been setting the LAN IP for the 7750 as 10.0.0.241 and the WAN IP as 10.0.0.254.

I have tried numerous combinations of these configuration elements and it seems like turning off NAT always keeps me from being able to access anything beyond the 7750 itself. Combining all of these configurations leaves me unable to get an IP Address through DHCP (No communication to the 9850) and usually unable to even get back to the 7750. I have to reset it and start over to get connectivity back through this router.

Leaving it in a generic configuration, with double NAT and separate subnets, gives me fine connection to the internet. I would simply rather consolidate everything into one subnet.

Could anyone tip me off as to where all of this is going wrong? I really just want the 7750 to act as an access point, with the 9850 doing the brunt of the work.

 

[jemz0r]

7750 should be set up as follows:

Connected to 9850 on LAN port. DO NOT use WAN port.
Disable DHCP
Disable NAT
Set Static LAN IP in same range as 9850

Ex: 9850 (10.0.0.1), 7750 (10.0.0.254)

 

[dillius]

Wow do I feel like a fool.

Is a crossover cable required for this or will the systems adapt?

EDIT: Actually I may be confused. On the 9850's LAN port, but what port of the 7750's? I assumed it's WAN port.

 

[jemz0r]

Both 9850 and 7750's RJ45 ports support Auto-MDIX which means it will auto-detect whether the cable is cross-over or not.

So yes, you can use a cross-over cable.

But you really just need a normal RJ45 cable.

Connect Internet device (ADSL / Cable modem) to 9850 (WAN port)
Connect from 9850 (LAN) to 7750 (LAN).

 

[dillius]

Both 9850 and 7750's RJ45 ports support Auto-MDIX which means it will auto-detect whether the cable is cross-over or not.

So yes, you can use a cross-over cable.

But you really just need a normal RJ45 cable.

Connect Internet device (ADSL / Cable modem) to 9850 (WAN port)
Connect from 9850 (LAN) to 7750 (LAN).

Thanks a bunch; that was insanely frustrating.

I had been going 9850 (LAN) to 7750 (WAN) the entire time. Now it is working perfectly.