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LTM Policy don't trigger on ALPN in SSL_Client_Hello

CEnroth
Nimbostratus
Nimbostratus

Hi

Have someone successfully managed to get a LTM Policy to trigger on ALPN in "SSL Client Hello"?

I have created a policy like below, and attached it to a Virtual-Server.
But when I send/connect to VS, policy won't trigger and nothing is written to my log.
I have also tried with different Index values, but that makes no difference.

CEnroth_0-1698772518975.png

I have verified that the ALPN is present in TLS request, both with Wireshark but also with an iRule attached to same VS.

iRule:

CEnroth_1-1698772829499.png

WireShark:

CEnroth_2-1698772914348.png

Regards
Christian

 

 

2 REPLIES 2

I've been playing with this, but also couldn't get it to work. It's unclear what index the SSL Extension alpn in the policy would be a valid one.

Hi Niels

I really appreciate your help. For a while i thought i had done something wrong. But if you have tested it, and
also can't get it to work then I’m quite sure that it is a "bugg" in the way Big IP handles ALPN in TLS packages.

I will open a case towards F5, and see what kind of solution they will come up with.

Regards
Christian