Linking Together Two Modems Across an Office Building

Hello,

I'm trying to establish a redundant Internet connection using two different modems from separate ISPs.  The idea is that if one of the modem fails to connect to the Internet, then all computers on the network can fall back onto the second modem's connection.  The offices are separated by about 100 feet.  A wireless solution would be ideal, but a wired solution would be acceptable as well.

Thanks for the help!
NinEliAbeAsked:
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pergrConnect With a Mentor Commented:
Preferably put a cable between the offices.
You can use an "outdoor" UTP copper cable, but a fiber cable will not cost much more.

Next, use routers with some intelligence - like the Juniper SRX100 (about $500 each). These can monitor the ISO they uplink to, and inform each other about the status (by advertising a default route to each other.

This way each office will use the local ISP, normally, but the ISP of the other building if the local ISP is down.
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AkinsdConnect With a Mentor Network AdministratorCommented:
You will need an enterprise router or firewall and configure failover

https://supportforums.cisco.com/thread/2094046
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pergrConnect With a Mentor Commented:
PS. The SRX100 is both a firewall and an intelligent router.
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NinEliAbeAuthor Commented:
Thanks for your responses.  While we are trying to string a cable between the two offices, we don't own the intervening space.  This is why we would like to consider a wireless option for achieving desired functionality.  Any suggestions?
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AkinsdConnect With a Mentor Network AdministratorCommented:
There is no direct wireless failover technology between ISPs - At least not discovered yet. Nice concept though.

You will still need to configure a router of firewall to failover between the ISPs.

Your modems will connect to the router or firewall.
Your wireless router would then connect to the router.
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NinEliAbeAuthor Commented:
How about not having a failover, just a good solution for a wireless "cable" between the two offices?
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pergrConnect With a Mentor Commented:
You'll find on the market wireless point to point links, including both radios and some sort of directional antennas. Effectively it will work as an Ethernet cable between the two routers.
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AkinsdConnect With a Mentor Network AdministratorCommented:
I'm not sure if I understand your question very well.

Are you trying to network both offices?
If yes, then you have several options
- vpn, mpls, frame relay etc
- Direct cabling (if allowed /if possible)
- Outdoor wireless bridge (requires unhindered line of sight between the buildings)
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NinEliAbeAuthor Commented:
Thanks to both of you.  Pergr is addressing the issue we have- do you have any recommendations for wireless point to point products that would do well going through a about 200 feet of office building with perhaps 5 intervening walls?
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pergrConnect With a Mentor Commented:
You are going to need line of site, and no walls.

With directional antennas 200 feet is nothing.

You may need to consider going up on the roof, with outdoor equipment.
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NinEliAbeAuthor Commented:
We are stuck with walls, so does that rule out indoor wireless point to point in your estimation?
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AkinsdConnect With a Mentor Network AdministratorCommented:
I am only versed on Cisco products but I found some other links that may help.

Just google "Outdoor Wireless Bridge"
Note
- Outdoor wireless bridge (requires unhindered line of sight between the buildings)


http://www.cisco.com/en/US/docs/wireless/bridge/1400/installation/guide/higch1.html

http://www.wirelessnetworkproducts.com/wirelessbridgebundles.aspx
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pergrConnect With a Mentor Commented:
Yes, no chance indoors through those walls.
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