how many clients use TCP Radius

Alan DeKok aland at
Wed May 4 02:56:03 CEST 2016

On May 3, 2016, at 8:45 PM, Florin Andrei <florin at> wrote:
> What clients actually use Radius over TCP? I can't find anything out there that's widely deployed and can query a Radius server over TCP. E.g. the Cisco documentation for routers, etc. seems to indicate that they only do UDP.

  Most things only do UDP.

> The reason why I'm asking - I'm looking into setting up authentication for a variety of clients, with Radius used as a transport protocol, and I'm wondering if it's worth the trouble to even think about enabling TCP, or promising I could offer TCP.

  Don't use TCP.  Use TLS over TCP.  The RADIUS over TCP RFC says this explicitly.

  Alan DeKok.

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