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145 posts

Master Geek
+1 received by user: 1

Topic # 151931 10-Sep-2014 12:53
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I am having a bit of trouble with my network setup trying to add a separate section onto the network.

My Current Network Setup

Current Network Setup

What I am trying to achieve:
New Setup

Now my Apple Time Capsule is telling my of a Double NAT issue, the setup seems to work most of the time. However it causes issues every few days with the other devices on the network becoming slow or non-responsive (since introducing the Apple time Capsule into the network). These problems are resolved by unplugging the cable going to the Apple Time Capsule.

With the Apple Time Capsule I can put it into bridge mode however it will then not create a seperate subnet for the devices it hosts. 

I do have another router available (Belkin F5D8235-4 v1) which I can put between the Apple Time Capsule and the Vodafone modem ( in order to create a separate subnet and then put the Apple Time Capsule into bridge mode.

My question is how do I make this network setup work smoothly whilst mainting a seperate subnet?

Any advice would be greatly appreciated.

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393 posts

Ultimate Geek
+1 received by user: 75

  Reply # 1125734 10-Sep-2014 13:09
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I'm having a hard time understanding how your network is functioning properly at the moment? You've got two ADSL lines coming in, both plugged into separate modems which then plug into each other and both run DHCP? What are you trying to achieve with the two lines? Is there a specific reason why the setup is like this?

Surely it would make logical sense to have a router that load balances those two connections if that's required and then have one DHCP server, one subnet etc?


145 posts

Master Geek
+1 received by user: 1

  Reply # 1125741 10-Sep-2014 13:17
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Thanks for your reply, currently the adsl lines come in at different parts of the property which prevents use of a load balancing router effectively. 

The internet connections are currently used separately as the second line serves one part of the property, however we need access to some devices on the network for local access not to really share the internet connection as this serves more as a backup function. 

Whilst it is a bit of a unconventional setup the network has functioned without issues like stated until introduction of the second subnet (using the Apple Time Capsule). 


7 posts

Wannabe Geek
+1 received by user: 1

  Reply # 1125752 10-Sep-2014 13:30
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mme you need a firewall behind your 2 modems, put both the modems in full bridge or half bridge and run it into the firewall , then get the firewall to carve up your network how you want.

Google "ZeroShell" , its pretty good, tons of docs online to help you out. good luck cool.

'That VDSL Cat'
7280 posts

Uber Geek
+1 received by user: 1431


  Reply # 1125757 10-Sep-2014 13:45
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regardless of distance between the two modems, if your trying to manage sharing across them, ild look at bringing a firewall to handle it nicely into the mix.

as for the airport, could you simply disable dhcp on it? then it will simply act as a dumb wireless AP.

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Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.

24 posts

+1 received by user: 4

  Reply # 1128622 14-Sep-2014 21:53
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You need a route back to your 2nd subnet.

The top left router needs a route to your 2nd subnet via the IP address of the router on the right. Packets will be able to leave the 2nd subnet via its default gateway. The right hand router will forward packets to its default gateway (not sure if its the top or bottom left router from your info) this will then NAT out your traffic but on response it does not know where to route traffic to the 2nd subnet. (This assumes that you have NAT disabled on your right hand router - you don't need it here)

As per the above posts you really need some better gear to manage this, can you run more then one cable to the other section of the building with the 2nd DSL router? If yes then use a firewall at one location, it can connect to the 2nd DSL router and still serve the LAN in the other half.

If no then you might want to look at using managed switches and use VLANs on the one cable you have. I can offer advise on small cheap managed switches if needed.

You could also use some fudging to load balance on the cheap. Have your 1st subnet (the one on the top and bottom left) all use one of your DSL routers as their default gateway. Then if you know your email provider for example is always you could add a route for via the other router. Traffic bound for this IP will then always route out of the other DSL line. But I doubt you will be able to setup any sort of failover using this as your routers probably want have any probe based routing features.

Hope this helps

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