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jagdtigger

Strange DNS behavior when connected to university network

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Posted · Original PosterOP

So i had a tiny problem when i tried to use my VPN on the university's network but DNS wasnt working correctly. Every query had ".sze.hu" slapped to the end:

https://www.dropbox.com/s/uw9a5pqyjr2hh9p/Screenshot_20190621_113824.png?dl=0

 

The VPN itself is functional as far as IP based connections go, but anyrhing that relies on DNS is just dead.

 

Any ideas what could be causing this?

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Posted · Original PosterOP
5 hours ago, BubblyCharizard said:

cant you change the DNS settings to something more reasonable 

 

like cloudflare's 1.1.1.1 or google's 8.8.8.8

The client supposed to use the DNS server(router) provided by the vpn server upon connection... I use OpenVPN and its running on the router(pfsense) along with the DNS resolver. Client machine runs linux

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My guess would be its treating all DNS queries as local LAN hostnames.  Now HOW its managing to do that I'm not sure.

You could try looking into how you flush the DNS cache on your particular Linux distro, although I think OpenVPN is supposed to do this automatically on connection.


Modems: 2 x VMG3925-B10B V5.13(AAVF.12)C0-jumbo
Router: i5-7200U appliance running pfSense.
ISP: Zen Unlimited Fibre 2 + Plusnet Unlimited Fibre Extra. (~60Mbit each)

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It's because your PC is part of the university domain and is expecting the domain's DNS server. This thread may be of use to you https://askubuntu.com/questions/1032476/ubuntu-18-04-no-dns-resolution-when-connected-to-openvpn

 

I'm not overly familiar with how Ubuntu handles DNS whilst on a domain so my help here is limited.


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