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Wireless Guest access on routers - how safe is it? Can they be hacked?

Posted on 2014-11-05
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Last Modified: 2014-11-14
Some netgear and Linksys routers offer guest access.
How safe are these?

Is there a risk of someone with knowledge gaining access to you LAN?
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Question by:feck1
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Dr. Klahn earned 250 total points
ID: 40424732
If the router does not offer open source firmware, I would not trust it.  This is a personal opinion based on the fact that US government agencies have in the past, and continue to, demand back-doors into equipment and software.  If there is an exploitable back door, someone will find it.  There are plenty of people in "eastern Europe" who have time on their hands.

If the router offers open source firmware, I still would not trust it due to the same reason above.  If there's a hole someone will find it.

Either you trust someone enough to give them access to your LAN, or you don't.  "The fact that you're not paranoid does not mean they're not out to get you."

IMO, a better solution is to put a router in front of a router creating a DMZ between.  Use two different manufacturers' products.  Give guests access to the outer router, but not the inner router.  Run your LAN on the inner router.  You then get double protection of the inner LAN, and can periodically change the password on the outer router to re-secure the "guest" network after someone has used it and no longer requires access.
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by:feck1
ID: 40424788
Good thinking. DMZ? What that?
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by:Dr. Klahn
ID: 40424810
DMZ is shorthand for DeMilitarized Zone.  It refers to an area located between two routers.  In this case the DMZ and the guests are in the first / outer router (the one which faces the internet), and your own LAN is in the second / inner router (the one which faces the first / outer router.)
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Author Comment

by:feck1
ID: 40424928
Ok so www ---> guest router -----> wan port of internal router
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by:Dr. Klahn
ID: 40425046
Correct.  Outward facing router (any wired port) provides a wired connection to inner router's incoming WAN port.
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Author Comment

by:feck1
ID: 40425085
Very well explained
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Author Comment

by:feck1
ID: 40425102
So the "guest" router wireless would be configured as normal and no "guest" wireless feature required.
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Author Comment

by:feck1
ID: 40425105
Like some routers have a <x> enable guest access. But in this case I don't need it - correct ?
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Expert Comment

by:Dr. Klahn
ID: 40425114
That's correct.  Set up one WiFi network on the outer router for guests.  Set up another on the inner router for yourself.  If either router has guest capability, disable it.
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Author Comment

by:feck1
ID: 40425146
So use diff router brands.
What are the chances of someone with vast networking experience hacking into the LAN for the guest router. Not govt / CIA or anything!
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Expert Comment

by:Dr. Klahn
ID: 40425202
Given enough time and effort, I believe anything can be cracked.  The probability in this case is small if the router firmware is kept up to date.
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Assisted Solution

by:Asif Bacchus
Asif Bacchus earned 250 total points
ID: 40428430
I would suggest you consider the two networks you are trying to isolate.  Is this for home use, a small business or a large enterprise?  Since you are looking at routers with 'guest networks', I would assume this is for home use.  In that case, what do you consider the likelihood of someone trying to hack your network?  Do you have very sensitive data you need to protect? Are you planning on running the guest network as an open network (no password) or will you still be using WPA2 and then just give your friends the password?

If you are looking at just providing a guest network so that your friends can connect to the internet when they visit but you don't want them on your internal network, then any of the Linksys/Netgear/ASUS/etc. guest-mode routers will more than suffice.  If you are looking at providing an open-authentication wi-fi hotspot, then I would go for at least custom firmware which will do a better job isolating the VLANs (internal vs guest).

For most home or even small business uses, the standard retail routers (custom firmware again is better) isolate traffic quite well.  If you are looking to secure an enterprise or very sensitive data then you are looking at the wrong solutions here and the whole DMZ double router idea proposed by other experts is the way to go.  In fact, I would build a custom BSD box instead of buying a retail router.

Hope that helps.
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