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shoneycutt_8454's avatar
shoneycutt_8454
Icon for Nimbostratus rankNimbostratus
Nov 07, 2017

When using the radius monitor should the F5 accept the access-reject message as a successful response to the monitor?

I'm trying to use the radius monitor on an f5 running 11.4.1. I have configured the uname/password/secret information. In the debug of the monitor I see the access-request go out and the access-rej...
devops
LTM
janholtz_40468's avatar
janholtz_40468
Icon for Nimbostratus rankNimbostratus
Jan 21, 2019

As my late father used to say: "Bugger off is also an answer". Here's a null radius request:

Access-Request (1), id: 0x00, Authenticator: 00000000000000000000000000000000
  User-Name Attribute (1), length: 9, Value: 0000000
    0x0000:  3030 3030 3030 30
  User-Password Attribute (2), length: 18, Value: 
    0x0000:  3030 3030 3030 3030 3030 3030 3030 3030
  NAS-IP-Address Attribute (4), length: 6, Value: 127.0.0.1
    0x0000:  7f00 0001
  NAS-Identifier Attribute (32), length: 11, Value: localhost
    0x0000:  6c6f 6361 6c68 6f73 74 out slot1/tmm0 lis=

And its (valid) 'bugger off' answer:

Access-Reject (3), id: 0x00, Authenticator: xxxxxxxxxxxxxxxxxxxxxxxx in slot1/tmm0 lis=

Here's the UDP hex strings to send & expect: Send:

\x01\x00\x00\x40\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x09\x30\x30\x30\x30\x30\x30\x30\x02\x12\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x04\x06\x7f\x00\x00\x01\x20\x0b\x6c\x6f\x63\x61\x6c\x68\x6f\x73\x74

Expect:

\xcc\xb4\x64\x08\x5e\x35\x2c\xaf\x85\x0f\x26\x42\x21\x51\x6a\xaf

Works a treat.

BR Jan