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this post was submitted on 04 Mar 2024
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Energy consumption is essentially the same, as it's using the same radios.
For what it's worth, I have several SSIDs, each on a separate VLAN:
(to remotely access home automation stuff, I use Home Assistant via a Tailscale VPN)
Most of these have both 2.4Ghz and 5Ghz enabled, with band steering enabled to (hopefully) convince devices to use 5Ghz when possible.
This is on a TP-Link Omada setup with 2 x EAP670 ceiling-mounted access points. You can create up to 16 SSIDs I think.
How do you accomplish this isolation since they're on the same subnet/broadcast domain? Is it a feature of the hardware you're using?
A lot of access points, even consumer-grade ones, have this option. It's usually accomplished via predefined firewall rules on the access points themselves.
Consumer-grade access points usually let you have just one isolated guest network, whereas fancier ones (Omada, Unifi, Ruckus, Aruba, etc) usually let you enable isolation for any SSID (ie the "guest network" is no different from any other SSID)
Isolated guest networks I get, but isolating guests from other guests on the same subnet/isolated net is what I haven't seen.
The APs know who the Wi-Fi clients are and just drops traffic between them. This is called client/station isolation. It’s often used in corporate to 1) prevent wireless clients from attacking each other (students, guests) and 2) to prevent broadcast and multicast packets from wasting all your airtime. This has the downside of breaking AirPlay, AirPrint and any other services where devices are expected to talk to each other.
If there's an option on the AP to not permit link local routing within a vlan/ssid, that will force all traffic up to the firewall. Then you can block intrazone traffic at the firewall level for that vlan.
I've seen this in Meraki hardware where it's referred to as "client isolation". Ubiquiti might be able to do this too.
I used to have a Netgear Nighthawk router/AP I bought from Costco, and if I remember correctly, its guest network automatically isolated guests from other guests. This router didn't support VLANs so I think it was just a bunch of firewall rules.
For Unifi devices you setup a Virtual Network then assign the guests to that. https://help.ui.com/hc/en-us/articles/115000166827-UniFi-Hotspot-Portal-and-Guest-WiFi
I'm not seeing anything there that says guests can't see other guests - quite the opposite.
I suppose a switch could be configured to prevent traffic going to other ports, which is how I would assume this would have to be done. This functionality would have to exist in the access point, I guess?
Does UniFi have a feature to isolate devices from each other on the same subnet? Seems like it would require some kind of Layer 2 routing?
It does. I have it enabled and tested. "Client Device Isolation." It's enabled per SSID.
Oh, neat. I'll have to look into it.
Thanks!
Unifi out of the box settings.
Ooh I like the idea of "no Internet." I do trust all of those devices (open source), but they could still be pwned.
That was an amazing read. Thank you.
What do you say is the use case for separating guest Wi-Fi with the more "private" stuff on your network?
As far as I understand... Basically all communications, even inside a network, are encrypted... So I guess you do that to avoid someone trying to exploit some vulnerability?
LOL, oh no.
Even internet traffic isn't encrypted by default.
Sadly TCP/IP isn't encrypted.
I think the main benefit is that Guests devices on your network can't find and exploit your own devices.
If you don't trust the person, why give them access to your WiFi in the first place?
You can trust the person, without trusting their technical skills, such that they haven't inadvertently installed malware on their own devices.
Remember that once you give the password out, they likely have the password from now on. They will always have access until you change the password.
No, a lot of local traffic is not encrypted, especially residential. No, residential probably doesn’t use much authentication or separation of privileges.
I don't want my guests to be able to access my home server or Omada controller for example, or spread malware (their phone may have malware without them even knowing). Also, I give the guest wifi to people other than friends, like contractors. Phone reception is horrible at my house so I give them the wifi so they can use wifi calling.