Networking: How to add another router

[Michael Tewner]

Hi -
Shimi's solution will work - use a cross-over cable, though, in order to
connect the switches together.

Hypothetically, you should be able to connect multiple computers to the same
network cable - that is, wire 2 connectors, in series, at one end. This
would give you a "hub" on that segment, and the network cards should manage
the collisions themselves. I wouldn't recommend this, though, and I present
it strictly as a thought experiment.

-Mike


2011/2/13 shimi <linux-il at shimi.net>

>
> On Sun, Feb 13, 2011 at 6:47 PM, Geoff Shang <geoff at quitelikely.com>wrote:
>
>> Hi,
>>
>> I find myself with the need to connect 5 ethernet devices to 4 available
>> ports.
>>
>> I'm running an ADSL modem/router with a 192.168.2.x network (for
>> historical reasons) and have allocated static addresses to all of the static
>> devices, and a pool of DHCP addresses for devices which ask for it.
>>
>> Right now the fifth device is running on wireless but I want to plug it in
>> if I can.
>>
>> A quick Google tells me that there's no kind of double adaptor available
>> to help solve my problem.  The closest I've seen is a way to send two 10/100
>> mbps Ethernet feeds down the one ethernet cable, but you still need two
>> ports at each end.  I only have one so that's no good.
>>
>> Assuming that there is no such double adaptor device that I can use to get
>> me a fifth port, the only solution I can see is to drag out the Edimax
>> router I have here which is no longer being used.
>>
>> Assuming I do this, I'm wondering how to configure it.
>>
>> I'm guessing that it will actually have to route.  I can't see myself
>> doing bridging because there'll have to be two devices on it (the router
>> will need to take up one of the 4 ports on the modem/router so this then
>> leaves 5 devices and only 3 other ports,).
>>
>> Presumably I need to configure the WAN port so that it connects to the
>> existing network.  Do I need to set aside a subnet of the 192.168.2.x
>> network specifically for the second router, or can I just enlarge the entire
>> network and have it all just cope, with the right packets going to the right
>> places?
>>
>> My preference would be to be able to keep it all as one big network, as
>> I'd rather not have to reallocate static addresses if I can help it, which
>> I'm guessing I'd have to do if I had to make the second router have its own
>> subnet of the 192.168.2.x network.
>>
>> Netmasks and such tend to confuse me a little and I'm not sure what I
>> should be doing here, so any suggestions would be helpful.
>>
>>
> Take the un-used router; Go into its configuration; Disable the Internal
> DHCP server; Verify that the router does not have an IP address which
> already belongs to any other device in your LAN (if it does, change it to
> something else. best something on a different netmask altogether...);
>
> Then, disconnect one of the devices on your currently active 4 port router;
> Connect a cable between the now vacant port to one of the LAN (note: NOT the
> WAN!) ports of the un-used router. Then you can use the extra vacant ports
> of the previously un-used router as an extension to your existing network.
> (The 4 ports in any common router are actually a switch...)
>
> Good luck,
>
> -- Shimi
>
>
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