DHCP Challenge - Can you solve it???

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shearder

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Hi all

OK so i have a LAN in my house which i have had for MANY years. I now have changed to a wireless provider (again) and now i have a challenge that i am hoping someone can suggest a simple method of getting DHCP assignements to the client devices.

So this is how it looks:
LAN.jpg

IN simple terms, the OLD router has DHCP functionality as does the NEW router. BUT, here's the kicker, the NEW router uses itself as the gateway and i can;t change it Huawei WS319. The old one is an ASUS and i can set the gateway that must be broadcast. SO DHCP works perfectly.

The NTU is x.x.0.1, New is x.x.0.2 and the Old is x.x.0.3. I want DHCP to run over the network for obvious reasons.

There is no PPoE etc. It is a simple gateway via x.x.0.1 to the internet direct. I want to use the old ASUS x.x.0.3 as an extender.

DHCP works perfectly on both routers with the exception of the NEW wanting it's IP to be the gateway.

Any ideas? I hope I have given enough info.
 
You will have to enable NAT on the new router and run a different subnet for your internal LAN.

Then they will use the new router as gateway and the traffic will be natted to the wireless NTU.
 
Cant you set the DNS of the New router to the NTU ?

Then New router does the DHCP, and you do DHCP fowarding on the old router ?
 
OK i can try that too - so the NEW router should be on the same subnet as the NTU i.e. 0.x and the rest of the network on 1.x?

TheGuy said:
You will have to enable NAT on the new router and run a different subnet for your internal LAN.

Then they will use the new router as gateway and the traffic will be natted to the wireless NTU.
Click to expand...
 
If there is a dedicated WAN port on the old router just plug the new router in there.
 
Not sure why people want your to change subnets and all kinds of fancy stuff. Decide who is going to dish out your DHCP, new router? Cool, turn off DHCP on the old router, then setup the gateway in it's DHCP settings to be x.x.0.1 instead of itself. Done.
 
That was the issue @halfmoonforever. The new router does not allow you to specify the gateway in the DHCP settings. It simply adds itself as the gateway. The old router has the ability to specify the gateway as 0.1 and not itself.

halfmoonforever said:
Not sure why people want your to change subnets and all kinds of fancy stuff. Decide who is going to dish out your DHCP, new router? Cool, turn off DHCP on the old router, then setup the gateway in it's DHCP settings to be x.x.0.1 instead of itself. Done.
Click to expand...
 
Hey @dade

Yes the old router does have a dedicated WAN port. I will try that. SO in the same breath the old and new on different subnets? how would that affect the DHCP I still want to use both routers so i can extend the range with the old one.

dade said:
If there is a dedicated WAN port on the old router just plug the new router in there.
Click to expand...
 
shearder said:
Hey @dade

Yes the old router does have a dedicated WAN port. I will try that. SO in the same breath the old and new on different subnets? how would that affect the DHCP I still want to use both routers so i can extend the range with the old one.
Click to expand...

In the old routers WAN connection settings you will have to set it to DHCP. Then the new router will act as the "ISP" for the old router and no further changes should be required.

Hope it makes sense.

EDIT: you don't have to worry about the subnets they will be kept completely separate.
 
shearder said:
OK i can try that too - so the NEW router should be on the same subnet as the NTU i.e. 0.x and the rest of the network on 1.x?
Click to expand...

Correct the new router's WAN port will be in the same subnet as the SP NTU and then the LAN on the New router will be on its own subnet.
 
shearder said:
Hey @dade

Yes the old router does have a dedicated WAN port. I will try that. SO in the same breath the old and new on different subnets? how would that affect the DHCP I still want to use both routers so i can extend the range with the old one.
Click to expand...


Once you have the new router setup do the following to the old one:

1. Setup Old router with IP address in the same subnet as the new router LAN
2. Disable DHCP on old router.
3. Plug it into one of the LAN ports of the new router.

Or you could leave the old router in place and do the same as above to the new router.
 
Hey TheGuy AND others. I have my network running

OK so i left the old router in place. Plugged the NTU into the WAN port. COnfigured the WAN IP to 0.2 and gateway 0.1 then LAN ip 1.3 and new router 1.2. I enabled DHCP ion the OLD router and WIFI channel 5 and new router WIFI channel 2. I sent DNS to OLD router IP and configured DNS servers in the DHCP settings.

All up and running :) - i didn't initially think to use the WAN port - THANKS TheGuy!!

TheGuy said:
Once you have the new router setup do the following to the old one:

1. Setup Old router with IP address in the same subnet as the new router LAN
2. Disable DHCP on old router.
3. Plug it into one of the LAN ports of the new router.

Or you could leave the old router in place and do the same as above to the new router.
Click to expand...
 
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