New customer - greenfield setup
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For filtering I would just do DNS filtering redirect all DNS traffic to your preferred solution. Make sure you include DNS over TLS traffic as @JaredBusch points out.
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@jaredbusch said in New customer - greenfield setup:
@dashrender said in New customer - greenfield setup:
Should they go DNS filtering or NGFW with filtering subscription?
2 years ago, I would have said DNS filtering. But now browsers are starting to go around DNS with built in DNS over TLS and such.
But even 2 years ago I would have asked why they actually need filtering.
Can they not just discipline employees? Because this is jsut stupid talking.
@dashrender said in New customer - greenfield setup:
They want web filtering to keep porn/guns/violence, etc at bay.
It's less about employees and what is accessed on their guest WiFi. They will have clients spending hours in the office, likely on the internet much of that time.
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@jaredbusch said in New customer - greenfield setup:
@dashrender said in New customer - greenfield setup:
Should they go DNS filtering or NGFW with filtering subscription?
2 years ago, I would have said DNS filtering. But now browsers are starting to go around DNS with built in DNS over TLS and such.
I know several DNS providers were starting to provide DNS over TLS, and that several of the browser vendors were saying - as long as the provided DNS provider used DNS over TLS or HTTPS then the browser would respect the system's IP settings.
Have you found that to be not true? - then again, how would you know other than the traffic going to known browser based DNS over TLS IPs.
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@jaredbusch said in New customer - greenfield setup:
But even 2 years ago I would have asked why they actually need filtering.
Can they not just discipline employees? Because this is jsut stupid talking.
We've all asked this question over the years. And in general I agree with you. Sadly there's more requirements for companies to keep their workspaces harassment free, etc.
But really, the best reason for DNS filtering is - defense in depth. If the DNS server can keep a computer from even visiting a known good bad IP, that's just one more helper in the war. Sure there are false positives, assuming there aren't many of those, you just fix it and move on. If there are - then you find a new provider who it's so bad at it.
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@dashrender said in New customer - greenfield setup:
the browser vendors were saying - as long as the provided DNS provider used DNS over TLS or HTTPS then the browser would respect the system's IP settings.
And since when has your stands router or Windows Server had DNS over TLS?
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For basic site filter, would you consider OpenDNS? Then, like Jared said, discipline the employees.
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@dave247 said in New customer - greenfield setup:
discipline the employees
Discipline of employees will only get you so far. You can have all the greatest intitions and an employee follows your policies - until - that one employee that becomes disgruntled and starts to poison another. Or in some cases - they try to actually do the job duties only to find that they cannot due to some over reaching policy and starts to find ways around the policy and security.
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@jaredbusch said in New customer - greenfield setup:
@dashrender said in New customer - greenfield setup:
the browser vendors were saying - as long as the provided DNS provider used DNS over TLS or HTTPS then the browser would respect the system's IP settings.
And since when has your stands router or Windows Server had DNS over TLS?
Good question:
Someone created a solution for Edgerouters two years ago
https://community.ui.com/questions/DNS-over-TLS-solution-for-EdgeMax-v2/aa0c5c80-1aae-4838-8b31-4dd7028b1219The windows client (10/11) saw it added to beta in 2020:
https://www.zdnet.com/article/microsoft-adds-initial-support-for-dns-over-https-doh-in-windows-insiders/
And full production:
https://techcommunity.microsoft.com/t5/networking-blog/making-doh-discoverable-introducing-ddr/ba-p/2887289Can't find anything about Windows Server DNS being updated as DOH resolver.
and no mention of DNS over TLS for Windows yet. -
For the filtering piece, I don't know that anything relying on DNS filtering alone would be adequate in a business environment. I'd come back to your firewall option from Sophos or an equivalent FortiNet product (just because that's what I'm used to) with a web-filtering subscription. That way even if you've got devices that are getting around your DNS (especially mobile devices) to look up the undesirable sites and services, the FW would still block traffic to and from the destination based on it's web-filtering. This should be possible without any MiTM type inspection as well.
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@dashrender said in New customer - greenfield setup:
@jaredbusch said in New customer - greenfield setup:
@dashrender said in New customer - greenfield setup:
Should they go DNS filtering or NGFW with filtering subscription?
2 years ago, I would have said DNS filtering. But now browsers are starting to go around DNS with built in DNS over TLS and such.
I know several DNS providers were starting to provide DNS over TLS, and that several of the browser vendors were saying - as long as the provided DNS provider used DNS over TLS or HTTPS then the browser would respect the system's IP settings.
Have you found that to be not true? - then again, how would you know other than the traffic going to known browser based DNS over TLS IPs.
That's just the thing. You need to block that crap.
- Block DNS over TLS in the firewall (port 853 outgoing).
- Block DNS over HTTPS in the firewall (port 443 outgoing to IPs of all known DNS providers like 1.1.1.1, 8.8.8.8 etc).
- Block DNS in the firewall (port 53 outgoing)
- Set up your DNS filtering and set the firewall to provide that DNS to everything on the LAN.
My general rule is to block everything outgoing except 80 (for redirect purposes) and 443. Then open up as needed.
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@notverypunny said in New customer - greenfield setup:
For the filtering piece, I don't know that anything relying on DNS filtering alone would be adequate in a business environment. I'd come back to your firewall option from Sophos or an equivalent FortiNet product (just because that's what I'm used to) with a web-filtering subscription. That way even if you've got devices that are getting around your DNS (especially mobile devices) to look up the undesirable sites and services, the FW would still block traffic to and from the destination based on it's web-filtering. This should be possible without any MiTM type inspection as well.
Yeah - this is where I'm leaning. I care less about the virus filtering on the guest network - where all the phones and guest devices should be.
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Not knowing all of the aspects you will run into, something we have here - and is a pain point sometimes is the WI-Fi and vLans.
We have iPads for certain tasks,.. we have a few RING cameras as well, In some cases - they only need to go to the internet - so they are routed as such.
The iPads are used as interruptor stations - so only need to hit that web site (iPads are MDM'ed), and the Ring camea only needs access to RING.
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@dashrender said in New customer - greenfield setup:
@notverypunny said in New customer - greenfield setup:
For the filtering piece, I don't know that anything relying on DNS filtering alone would be adequate in a business environment. I'd come back to your firewall option from Sophos or an equivalent FortiNet product (just because that's what I'm used to) with a web-filtering subscription. That way even if you've got devices that are getting around your DNS (especially mobile devices) to look up the undesirable sites and services, the FW would still block traffic to and from the destination based on it's web-filtering. This should be possible without any MiTM type inspection as well.
Yeah - this is where I'm leaning. I care less about the virus filtering on the guest network - where all the phones and guest devices should be.
Depending on how petty and litigious the guest network users might be, that could be a dangerous stance with regards to the guest network.
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@notverypunny said in New customer - greenfield setup:
@dashrender said in New customer - greenfield setup:
@notverypunny said in New customer - greenfield setup:
For the filtering piece, I don't know that anything relying on DNS filtering alone would be adequate in a business environment. I'd come back to your firewall option from Sophos or an equivalent FortiNet product (just because that's what I'm used to) with a web-filtering subscription. That way even if you've got devices that are getting around your DNS (especially mobile devices) to look up the undesirable sites and services, the FW would still block traffic to and from the destination based on it's web-filtering. This should be possible without any MiTM type inspection as well.
Yeah - this is where I'm leaning. I care less about the virus filtering on the guest network - where all the phones and guest devices should be.
Depending on how petty and litigious the guest network users might be, that could be a dangerous stance with regards to the guest network.
I personally do refuse to use any guest WiFi that requires the installation of a third party cert to use. That said - I can only recall this happening one time.
I'm not against DNS filtering - all the things Pete.S mentioned, but SSL inspection on guest - nope, not interested... Hell I'd be more worried about being sue for breach of privacy.
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@gjacobse said in New customer - greenfield setup:
Not knowing all of the aspects you will run into, something we have here - and is a pain point sometimes is the WI-Fi and vLans.
We have iPads for certain tasks,.. we have a few RING cameras as well, In some cases - they only need to go to the internet - so they are routed as such.
The iPads are used as interruptor stations - so only need to hit that web site (iPads are MDM'ed), and the Ring camea only needs access to RING.
These are my thoughts as well, it's one of the draw backs to Ubiquiti gear - limited to 4 VLANs on WiFi (at least used to be). For now, I think four will do me.
Production
IOT - internet only
Guest
medical equipment - future potential -
@dashrender said in New customer - greenfield setup:
@gjacobse said in New customer - greenfield setup:
Not knowing all of the aspects you will run into, something we have here - and is a pain point sometimes is the WI-Fi and vLans.
We have iPads for certain tasks,.. we have a few RING cameras as well, In some cases - they only need to go to the internet - so they are routed as such.
The iPads are used as interruptor stations - so only need to hit that web site (iPads are MDM'ed), and the Ring camea only needs access to RING.
These are my thoughts as well, it's one of the draw backs to Ubiquiti gear - limited to 4 VLANs on WiFi (at least used to be). For now, I think four will do me.
Production
IOT - internet only
Guest
medical equipment - future potentiallol - well as much as I don't like them - we use Cisco and Meraki... I think we have almost 30 vlans and a dozen SSIDs.. but some are getting added to retire others.
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@gjacobse said in New customer - greenfield setup:
@dashrender said in New customer - greenfield setup:
@gjacobse said in New customer - greenfield setup:
Not knowing all of the aspects you will run into, something we have here - and is a pain point sometimes is the WI-Fi and vLans.
We have iPads for certain tasks,.. we have a few RING cameras as well, In some cases - they only need to go to the internet - so they are routed as such.
The iPads are used as interruptor stations - so only need to hit that web site (iPads are MDM'ed), and the Ring camea only needs access to RING.
These are my thoughts as well, it's one of the draw backs to Ubiquiti gear - limited to 4 VLANs on WiFi (at least used to be). For now, I think four will do me.
Production
IOT - internet only
Guest
medical equipment - future potentiallol - well as much as I don't like them - we use Cisco and Meraki... I think we have almost 30 vlans and a dozen SSIDs.. but some are getting added to retire others.
I would never recommend those to a client. If they demand it, or it's already setup - that's different...
I'd rather look at aurba - though I've heard some positive things about TPLink.
The think for me now is the controller -
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@dashrender said in New customer - greenfield setup:
@notverypunny said in New customer - greenfield setup:
@dashrender said in New customer - greenfield setup:
@notverypunny said in New customer - greenfield setup:
For the filtering piece, I don't know that anything relying on DNS filtering alone would be adequate in a business environment. I'd come back to your firewall option from Sophos or an equivalent FortiNet product (just because that's what I'm used to) with a web-filtering subscription. That way even if you've got devices that are getting around your DNS (especially mobile devices) to look up the undesirable sites and services, the FW would still block traffic to and from the destination based on it's web-filtering. This should be possible without any MiTM type inspection as well.
Yeah - this is where I'm leaning. I care less about the virus filtering on the guest network - where all the phones and guest devices should be.
Depending on how petty and litigious the guest network users might be, that could be a dangerous stance with regards to the guest network.
I personally do refuse to use any guest WiFi that requires the installation of a third party cert to use. That said - I can only recall this happening one time.
I'm not against DNS filtering - all the things Pete.S mentioned, but SSL inspection on guest - nope, not interested... Hell I'd be more worried about being sue for breach of privacy.
Absolutely this too. A FW shouldn't have to do anything like MiTM for basic webfiltering, just block traffic out to undesirable sites. Your subscription service is keeping that list of sites up to date and accessible to you..... The SO's place of work wants to to dpi / MiTM on their guest wifi, so guess who's data plan got upgraded recently.
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@notverypunny said in New customer - greenfield setup:
The SO's place of work wants to to dpi / MiTM on their guest wifi, so guess who's data plan got upgraded recently.
Damn.. that sucks!
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@gjacobse said in New customer - greenfield setup:
@dashrender said in New customer - greenfield setup:
@gjacobse said in New customer - greenfield setup:
Not knowing all of the aspects you will run into, something we have here - and is a pain point sometimes is the WI-Fi and vLans.
We have iPads for certain tasks,.. we have a few RING cameras as well, In some cases - they only need to go to the internet - so they are routed as such.
The iPads are used as interruptor stations - so only need to hit that web site (iPads are MDM'ed), and the Ring camea only needs access to RING.
These are my thoughts as well, it's one of the draw backs to Ubiquiti gear - limited to 4 VLANs on WiFi (at least used to be). For now, I think four will do me.
Production
IOT - internet only
Guest
medical equipment - future potentiallol - well as much as I don't like them - we use Cisco and Meraki... I think we have almost 30 vlans and a dozen SSIDs.. but some are getting added to retire others.
knock wood beyond the price I can't say anything too bad about Meraki for wireless.... firewalls is another topic, but we've got their wireless deployed at 10 or so sites and it just works. The only thing I've had to do that's a bit outside the norm is script a nightly reboot of the antennas and it was setup strictly as a peace of mind thing as the gear is getting on in age.
