Queries RADIUS changed with IOS

Hello

I have a few AS5350 voice gateways using a dummy radius server that has a "small" bug. It can be configured for authentication to listen on a port and for the account on another port, but when a bunch of hits with any port udp source the IP address of the sender it is not responding on the same udp port, but it sends the packet to the ip of the applicant with the destination port udp as the same port the application was received.

I don't know if anyone understands what I just wrote, so, let me give you an example:

as5350 with IP 1.1.1.1 with RADIUS server 2.2.2.2 scenario auth-port 1645 1646 acct-port:

1.1.1.1.1645 > 2.2.2.2.1645

2.2.2.2.1645 > 1.1.1.1.1645

(If as5350 sends the request auth using local udp port 1645, auth works fine)

1.1.1.1.21645 > 2.2.2.2.1645

2.2.2.2.1645 > 1.1.1.1.1645

(If as5350 sends the request authentication uses the local udp port other than the port auth of my Department, identification fails because the fake Ray sends the packet using the destination udp port 1645).

Using Versions of IOS 12.2 XB, everything is OK, the as5350 sends its requests for udp 1645 the port always.

Using the Versions of IOS > 12.2 (11) T, AS5350 sends its requests using the port udp 21645. The quick solution should change the RADIUS to 21645 acctport, which I did, and everything was OK for about 10 minutes. After that, AS5350 began to send requests using the port udp 21646 I therefore had no auth.

I could not determine how it changes the udp source port, but the problem is that it makes.

My Question:

Is it POSSIBLE for me to make my AS5350 using IOS 12.3 (2) T to send packets of auth and acct to my radius server, using a source not variable udp port?

Check out http://www.cisco.com/cgi-bin/Support/Bugtool/onebug.pl?bugid=CSCea72719&Submit=Search and you will see that we have returned to the old behavior using 1645 only in 12.3 (3.6) T which is not available as yet (you could open a TAC case and get it posted for you if you wish).

For now, implement the workaround solution, but beware, this is a hidden command and apparently, although I have not tested, he don't just stand there after a reboot.

Tags: Cisco Security

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