Using different DNS servers per SSID

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rscole86

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#300819 6-Oct-2022 14:40

I would like to be able to use different DNS servers and thought the easiest way to switch would be to change SSIDs.

I want a high WAF way to utilise different DNS servers that could? be as simple as changing SSID.

SSID_1 that uses piholes
SSID_2 isolated and using ISP DNS, eg work wifi or guest wifi
SSID_3 using custom DNS servers

Bonus is if SSID_3 connected devices can still be Chromecast to/from. Ideally SSID_2 would be unable to.

I have an Edgerouter 4, a TP-link switch TL-SG1016PE and a GWN7610 AP x2.

I currently have eth1 serving all devices, wired and wireless, and two piholes for DNS. The router does the DHCP and some basic blocking of some ethernet devices.

The only way I think I could get it to work would be to put the AP on eth2, disable DHCP on the router, and get the AP to assign DHCP. I assume I would need some static routes for the piholes on eth1, from eth2? The problem I see here is that I would have to daisy chain the AP's to get them on eth2 (no spare swtich) and need power to the second device (unsightly and may not be possible).

I would still want all devices on SSID_1 and 3 to ideally see eth1 devices and Chromecasting to work.

To get this to work am I needing to look into VLAN tagging?

Any guidance apprecriated.

michaelmurfy

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#2978326 6-Oct-2022 14:55

VLAN Tagging would be what you'll do.

I personally have multiple VLAN's. With your Edgerouter you'd make multiple VLAN networks each with their own DHCP pool (it has been years since I've touched an Edgerouter though) On your Grandstream you'll tag this:

As you've got a smart switch you may need to either create "trunk ports" or allow the VLAN's over to your configured ports (router + access points). You can also tag ports to force them onto a particular VLAN.

Michael Murphy | https://murfy.nz
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shim99

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#2978350 6-Oct-2022 16:44

https://blog.gruby.com/2015/07/05/setting-up-a-guest-network-with-the-edgerouter-lite/

I used this blog to do something very similar.

openmedia

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#2978356 6-Oct-2022 17:14

I have freshtomato running on my firewall with multiple VLANs. Each VLAN can have its own DHCP and DNS.

Then each SSID is allocated to a different VLAN on my Aruba APs.

Generally known online as OpenMedia, now working for Red Hat APAC as a Technology Evangelist and Portfolio Architect. Still playing with MythTV and digital media on the side.

Earbanean

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#2978555 7-Oct-2022 12:19

I do almost exactly what you're after. I VLAN tag our tenants' network on Cambium WAPs, then set up separate DHCP and DNS server on an Edgerouter Lite. In this case, the DNS server is ISP. For everything else I use a Smart DNS service proving geo-unblocking. I also implement firewall rules on the ERL to separate the tenant network from everything else. It all seems to work well.