Traffic on port 53 fails on LTE but works on WiFi

Matthias Urlichs matthias at
Mon Nov 19 09:54:38 CET 2018

On 19.11.18 08:32, M. Dietrich wrote:
> Vodafone blocks UDP traffic on port 53 in LTE.
They don't block it – they redirect it to their DNS proxy.
> not even the handshake goes through. Not sure about the cause
> for that, maybe they want to control your DNS that way.

Redirecting port 53 to their DNS (presumably one close to their LTE
endpoint) is reasonable, that should improve speed.

The reason these providers block UDP altogether is simple – P2P file
sharing and similar shenanigans.

Is that complete block in the terms+conditions? If not, annoy their support.

-- Matthias Urlichs

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