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08-02-2012 05:07 PM  9 years ago
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rc.chris

rrApprentice

brunswick, ga. 31525

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router
Is it possible to run 2 routers on your home network? We have an apple airport extreme and our vista computers will not get online with it! Could I run the cisco router with it?
http://www.jaxrc.com
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08-02-2012 05:31 PM  9 years ago
ticedoff8

rrKey Veteran

Morgan Hill, CA. USA

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No.

If you draw the block diagram, it looks something like this:

ISP -- cable_modem -- home_firewall/router -- Home_Network_LAN.
The "cable modem" could also be your DSL modem - no matter.

The implications of "2 routers" is that you would somehow connect both WAN ports of these routers to the cable modem (or DSL modem).
But, both routers will be trying to get an IP address from the ISP - that wont work - the ISP will limit you.
Or, assuming they do get IP addresses form the ISP, they will fight each other for routing LAN traffic to the WAN - and one or both will shutdown (loop detection)

You could attach 1 router (Cisco?) to the cable modem, and then connect the AirPort to the LAN side of the Cisco. That would work okay. I do this to create a 2nd wireless network in the house for "guests".

But, I run 2 Apple MBP, 3 iPhones & an iPad + 3 Dell laptops (Windows 7) on one, main, Netgear wireless - no problems.
This doesn't count the 2 DirecTV DVR (on demand), 2 Windows 2008 R2 servers and my Vonage VoIP system on the "wired" LAN.

Do a search for "Mac Forums". You will see the AirPort Extreme shows up a lot
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08-02-2012 05:59 PM  9 years ago
sincity

rrVeteran

Pasco, WA

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It can be done. Just have to put a switch between the cable modem and the routers. This of course assumes they won't limit you by MAC address or your IP addresses.

Our cable company limits based on MAC address. So if a router ever goes bad, you have to call them with the new MAC or clone the mac to the new router.

And of course you can only connect to one router at a time.
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08-02-2012 06:04 PM  9 years ago
ticedoff8

rrKey Veteran

Morgan Hill, CA. USA

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Thanks for restating exactly what I said.
"Maybe it will, maybe it wont".

But, the problem is AirPort.
Connecting the WAN port of the AirPort Extreme to the LAN side of the Cisco will always work.

Unfortunately, it may not correct the problem that is basic to AirPort Extremes - they are problematic.
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08-02-2012 06:20 PM  9 years ago
bkervaski

rrElite Veteran

Birmingham, AL, USA

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Where most mess this up is with NAT (network address translation).

Only your gateway should be performing NAT, as long as that's the case, you can have as many routers as you want.

Doesn't matter if it's wired or wireless routers, TCP/IP exists above the wireless protocols.

ISP
|
|
ROUTER1 67.55.23.242 (Public IP) -> 192.168.1.0/24 (NAT)
|
|
ROUTER2 192.168.2.0/24
|
|
ROUTER3 192.168.3.0/24
|
|
...
|
|
ROUTER100 192.168.100.0/24

NAT basically performs translation and port mapping from your private to public IP addresses.

If you have multiple devices performing NAT port mappings get mangled and a router may think it's private IP is a public IP and possible integrated firewalls start getting in the way, etc.

Also, only one device should be performing private IP address allocation/assignment/distribution (DHCP).

For some reason, it's hard to find a wireless bridge, which is really what most people need to extend their home network.
It can be done. Just have to put a switch between the cable modem and the routers.
Unfortunately, this isn't going to help beyond physically being able to plug in the cables. With plug and pray soho equipment, the NAT and DHCP issues will still exist.
Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels
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