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Redundant network connections

I am being asked to spec a system for a private residence that needs redundant network connections. They will have cable internet as a primary connection and are not sure what to use as a backup.

I am looking for help with:

1. What kind of backup connections are most often used in situations like this. I assume it would be of a different media type, like DSL, satellite, or some other kind of wireless based option.

2. We need to spec Cisco equipment. What router (preferably an ISR not an ASA) would be the best option for this? I imagine an 1800 series router with two interface cards one for each connection would do. Thoughts?

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Craig Beck

8/22/2022 - Mon

I guess you'd want 2 nics, and/or two different ISP connections. I don't recommend satellite, it's very slow and very expensive.

As for your firewall, you might get a Cisco PIX at a decent price these days.
David Wall

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Price is not a concern with this project. Availability and security are the most important, pretty high budget on this one :)

I am looking for examples of how this would be done and anyone with experience setting something up like this. I need to be very specific with my evaluation. This is only a small piece of the entire network, but is of primary concern.



3G may be an option. I think that I will push the client to getting a commercial grade cable connection to begin with. It is in a mountain area and may not have good 3G service. Would the 3G connection be just like the ones cell phones connect to? Or would this be a different connection all together?
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David Wall

Yes it would be the same as cellular connection, in the uk it is available up to 7mbps but you rarely get it, it does work as a failover here though , my client gets about 1mb download
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Craig Beck


@craigbeck - that is a familiar unit to me, but does it require that the router itself be within 3G range? We may need to put an antenna up on the roof to get the best access. Would this allow it?
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Craig Beck

Yes, apparently.

From the spec sheet:

Antenna connector
For Express Card external antenna connection:
• TS9 type connector requires for PCEX-3G-HSPA-G and PCEX-3G-HSPA-US
• SSMB plug-type connector requires for PCEX-3G-CDMA-x* and PCEX-3G-HSPA-A
• SMKTS9 type connector requires for PCEX-3G-HSPA-R6

Included antenna
0-dB gain multiband dipole antenna on cradle with 4.5-ft cable