I configured dot1x port-authentication on a 3750. The switch sends out a request to the radius server. The radius server sends a answer-packet to the switch udp port 21645 but it seems the switch discards the packet or something like that. The radius server gets the answer "Destination unreachable, Port Unreachable"
Well, whether or not it send access-accept or access-reject is not the problem. The problem is a communication error because it can't reach the switch. We both have the same problem of the port being unreachable. In lh consultings case it was also an access-reject. In my case it's an access-accept.
But if the switch can rach the radius server on the same LAN, with no ACLs and no firewall, why can't the server reply to the switch port? That is the question here.
Hi All. Im having a very similar problem on a 6500.
6509 Loop0 - 172.16.17.1 (Radius Source)
Radius Server - 192.168.1.101 (TekRadius)
6509 SVI Interface - 192.168.1.252 (LAN Interface)
Using Wireshark I can see the radius communication to and from the correct IP addresses. But then I see port 21645 unreachable coming from the 6509's VLAN interface? Did you guys ever have any luck with this?
I have upgraded my switch to 12.2.52 and its now working properly!
I did have to reconfigure it as its now "Flex auth", and dont forget to add the pae authenticator on the interface, its not added by default now in case you dont want dot1x via radius (mac based and webauth is available too)
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