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Re: Question about geteduroam on an 'on boarding' VLAN

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  • From: Jethro Binks <jethro.binks AT>
  • To: eduroamUK <eduroamuk AT>, Paul Dekkers <paul.dekkers AT>
  • Cc: "geteduroam AT" <geteduroam AT>
  • Subject: Re: Question about geteduroam on an 'on boarding' VLAN
  • Date: Thu, 18 Mar 2021 14:32:14 +0000
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I'm actually not sure either!

Presumably you need to whitelist not only, but also the subsequent CDN names, since they will go back through the resolver to ultimately find an IP address!

At the moment that's, but I guess that might not be stable?

Our whitelisting is done at DNS level, not on the ultimately resolved IP, so that at least isn't a concern here, but could be an issue for other sites.

Of course, we're not actually on campus to be able to test all this, sigh ...


.  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . 

Jethro R Binks, Network Manager, 

Information Services Directorate, University Of Strathclyde, Glasgow, UK

The University of Strathclyde is a charitable body, registered in Scotland, number SC015263.

From: geteduroam-request AT <geteduroam-request AT> on behalf of Paul Dekkers <geteduroam AT>
Sent: 18 March 2021 14:12
To: eduroamUK <eduroamuk AT>
Cc: geteduroam AT <geteduroam AT>
Subject: Re: Question about geteduroam on an 'on boarding' VLAN


Currently cloudfront (the CNAME lookup will tell you that) but I'd rather keep the ability to change this over time.

If their DNS whitelisting would require whitelisting of what the CNAME points to, I'd create "alias" records instead on a different record.

If they do lookups for IP-addresses and whitelist those in the firewall instead of DNS, I'm not sure that would be sustainable.


On 18/03/2021 14:53, eduroamUK wrote:

Hi Paul,


Knowing which CDN you’re using for could certainly be useful, but yeah... I don’t know if CNAME entries will work or not.


I since also noticed the thread between yourselves, Cambridge, York and Strathclyde. You can add Cardiff to the list of those universities that use an on-boarding network.


With Kind Regards


Stefan Paetow

Federated Roaming Technical Specialist

eduroam(UK), Jisc


t: +44 (0)1235 822 125

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From: <geteduroam-request AT> on behalf of "geteduroam AT" <geteduroam AT>
Reply to: Paul Dekkers <paul.dekkers AT>
Date: Thursday, 18 March 2021 at 13:37
To: eduroamUK <eduroamuk AT>
Cc: "geteduroam AT" <geteduroam AT>
Subject: Re: Question about geteduroam on an 'on boarding' VLAN



Ah, this question came up recently on cat-users too:

On 18/03/2021 13:58, eduroamUK wrote:



One of our members is attempting to use geteduroam, but they find that the setup fails half-way through. The network they are using is a DNS-restricted VLAN, i.e. it is there purely to on-board their students and staff and as such limits access to only Google Play and eduroam CAT (and probably geteduroam).


They’ve attempted to add as many locations as possible they can think of, but it fails.


Is there any way to get debug logging for geteduroam (which we’ll be happy to get the member to provide), and do you know whether geteduroam uses a CDN per chance, and if so, which subnets of it should be allowed?


If you could let us know, that’d be fab!

Of course!

The geteduroam Apps use the '' hostname for the CDN/discovery files.

This is a CNAME actually; does that work with the whitelisting in DNS?

Besides this, '' is required for the CAT profiles.

Ah, I now realize I forgot another host that is still in the path. We should think about making that a prettier one than it currently is (a serverless endpoint, that I wouldn't want people to whitelist), but I'd need to know whether CNAMES work or not. And, well, we fixed some things on the CAT profiles that are no longer required actually since the last CAT 2.0.4 update.

I really didn't think about this way of onboarding/whitelisting, but I understand it's purpose. I thought I remember Stefan (W) wrote at some point that it wasn't the best thing to do with CAT either, but I fully understand why people do this, and don't want to make it impossible either.


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