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I have a home network based on the following:

Netgear ADSL Router at 192.168.2.1 This is defaul gateway and manages DHCP from 192.168.2.2 to 192.168.2.100 the Router is connected to a switch. An ethernet cable runs from this switch to another switch in another room where I have appliances who get DHCP addresses from the Netgear.

I want to add wifi connection into this other room. I have an unused TP-LINK router, of the type with no-DSL port, just 4 ethernet LAN ports, 1 wireless interface and 1 ethernet port named WAN.

The TP-LINK setup is apparently easy. I connected the WAN port to the switch. I configured the WAN interface such as:

IP address: 192.168.2.101 (part of my main network) Subnet mask: 255.255.255.0 DNS: 192.168.2.1 (the router actually connected to the network)

The LAN setup must be different so I decided for:

IP address: 192.168.3.101 DHCP on (from 192.168.3.10 to 192.168.3.20) Subnet mask: 255.255.255.0 DNS: 192.168.2.1 (the router actually conncted to the network)

It works, that is I can access the internet from wifi devices connected through the TP-LINK. But I cannot access the configuration setup from any device in network 192.168.2.X and I cannot figure why.

I tried port routing from 192.168.2.101 to 192.168.3.1 but without success.

In the meantime I changed the way, linking the switch to one of the LAN ports of the TP-LINK and disabling DHCP. In this case the TP-LINK acts as a wireless bridge and everything works. But still I do not understand what is it wrong with the routed setup where I cannot access the device.

Can anybody help me understanding what is wrong?

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So should your question really be why can't I access Router B's config page from Router A's clients? –  AthomSfere Nov 24 '13 at 22:01
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1 Answer

Most routers limit the ability to access the configuration pages from the WAN port (normally the Internet), due to security reasons. They often have a configuration setting allowing this, which you can select if you have a reason for it.

You don't say which TP-LINK router you are working, but to get an idea of what I am talking about, look at this document http://www.tp-link.us/resources/document/TL-WDR3500_V1_User_Guide_19100.pdf, section 4.13.4 "Remote Management" on page 80 (and the screenshot on the following page).

Unless you change the default (and provide an IP address in the router above), you will not be able to access the router's configuration page from the WAN port.

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