[X4U] Attaching A Router To Router

[Matthew Barr]

Y'all- the only thing to consider is that low end hubs/switches - 
Almost all hubs now are switches - have dedicated uplink ports instead 
of being auto-sensing.  What this means, in short, is there may be 5 
jacks on the switch, one of which says uplink.  The upstream line needs 
to be plugged into that jack, and the other machines into the other 
jacks.  However, the low end ones need to have the one directly next to 
the uplink left empty- it's an either/ or situation.


I'm not explaining this particularly well.. but it will help you friend.

The terms to google for are uplink, crossover, and ethernet.  
Basically, the uplink jack has the recieve & transmit lines crossed, so 
that it is able to connect to another hub/switch.  Some of the newer 
switches can detect either, and will work with both.  Most new macs, in 
fact, can connect with either type of cable, and will switch themselves 
to the correct options.

Matthew Barr
Managing Partner
Datalyte Consulting, LLC
Apple Authorized Reseller
mailto:mbarr at datalyte.com
cell: (646) 765-6878


On Feb 14, 2005, at 1:12 PM, Juan Pablo wrote:

> I have to agree, i would use a switch, i theory you dont have to setup 
> anything with it, if they are using DHCP he would have no problem, 
> unless the ip assignment is made based on  MAC address, but thats not 
> commonly used. I suggest you to tell your friend that he should try 
> with a switch, buying a router its s waste of money for this case.
>
>
> On Feb 14, 2005, at 2:26 PM, Richard Gilmore wrote:
>
>> What I would use is an Ethernet Hub. Netgear makes some good ones. 
>> That's
>> what we use. It's a little different from a router in that it doesn't 
>> assign
>> any IP addresses but redistributes them from the router upstream. 
>> Routers
>> can distribute hundreds of IP numbers but typically only have 4 ports 
>> on
>> them a hub allows for more distribution of those numbers without 
>> creating
>> any of its own. I think they're a little cheaper than a router too 
>> and they
>> require zero setup just plug and play.
>>
>>
>>> From: Allan Hise <allan at hise.org>
>>> Reply-To: "A place to discuss Mac OS X for the casual user."
>>> <x4u at listserver.themacintoshguy.com>
>>> Date: Mon, 14 Feb 2005 00:53:38 -0800 (PST)
>>> To: "A place to discuss Mac OS X for the casual user."
>>> <x4u at listserver.themacintoshguy.com>
>>> Subject: Re: [X4U] Attaching A Router To Router
>>>
>>>
>>>
>>> On Sun, 13 Feb 2005, revDAVE wrote:
>>>
>>>> A friend of mine has 2 macs in his office -  and wanted to purchase 
>>>> a router
>>>> so that they could both be on the Internet and doing some file 
>>>> sharing. ( I
>>>> guess currently only one computer is on the Net -  the other is 
>>>> just a non
>>>> Internet Business Computer right now.)
>>>>
>>>> I  suggested that his company might already be on a Bigger master 
>>>> router
>>>> system ( there are about 30 employees) -  and he thought that most 
>>>> likely
>>>> there was some previous system set up and that he was already 
>>>> receiving 1
>>>> Ethernet cable that was probably on that system already - he wasn't 
>>>> sure -
>>>> but that is my guess. However, he still wants to purchase a router 
>>>> to set up
>>>> these computers in his room.
>>>>
>>>> So I am asking - is it possible to purchase a router and set up on 
>>>> top of
>>>> another ( bigger) router. Let's assume that the large office gets 1 
>>>> T1 line
>>>> coming and - and goes to a master router - and one Ethernet cable 
>>>> goes into
>>>> his office.  Can I then attach his private router to the end of 
>>>> that cable
>>>> and set up a " sub system " for his 2 computers?
>>>
>>> Yes, this is possible. I would try just using a switch (or, less
>>> desirably, a hub) first, especially if the network uses DHCP (and 
>>> the IT
>>> guys allow the 2nd MAC address on the network). That would make 
>>> things
>>> much simpler, and cheaper.
>>>
>>> Otherwise, just setup the router to use NAT and the 1st router will 
>>> see
>>> the two machines as having the same IP address. Of course, this is 
>>> easier
>>> said than done and implementation depends on the router. And 
>>> depending on
>>> how the network is set up, you may end up with NAT upon NAT... (it 
>>> works,
>>> but can be ugly).
>>>
>>> So, there are a lot of variables. Seriously, see if you can go the
>>> switch/hub route first. Is there some reason he can't ask the IT 
>>> folks in
>>> his large office?
>>>
>>> Allan
>>>
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>>
>>
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