Destination port invalid

[Nathan Ward]

Hi,

> On 20/02/2020, at 10:53 PM, Bassem Mettichi <mettichi at gmail.com> wrote:
> 
> Hello,
> i have an issue with the response packet sended from my freeradius server
> to the NAS, a tcpdump on NAS side give this error message:
> 
> 
> The accounting response message is unfound,The message destination port
> invalid.ServerIP:0xac193c27 0x00000000 0x00000000
> 0x00000000,DstPort:31686,Correct Range:31671<=Port<=31685
> 
> Do you have any idea why freeradius choose this range port for response
> packet?


This is the destination port of the reply packet, which means it was the source port of the request.
FreeRADIUS did not choose this port, your NAS did.

If you look at a packet capture with the request and response, you will be able to verify this.

--
Nathan Ward