Destination port invalid

Alan DeKok aland at
Fri Feb 21 09:05:40 CET 2020

On Feb 20, 2020, at 2:40 PM, Bassem Mettichi <mettichi at> wrote:
> thanks a  lot for your response, i know that my Nas has chosen this port to
> send the request to my freeradius server, but the question
> why my radius server doesn't accept to use this port as a destination for
> sending packet response, the problem is on radius server not on NAS side, i
> don't really undertand this behavior.

  In your original message, you say that tcpdump on the NAS says that the destination port is invalid.

  This is not a FreeRADIUS issue.  tcpdump isn't FreeRADIUS.  The NAS isn't FreeRADIUS.  And even if the NAS is seeing an ICMP "destination unreachable" packet, that packet comes from the OS, not from FreeRADIUS.

  I don't see why there's an issue here, or what the issue is.

  The message you're worried about comes from the NAS, not FreeRADIUS.  So don't ask on the FreeRADIUS list why the NAS is producing the message.  Ask the NAS vendor what the message is, and what it means.

  Alan DeKok.

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