Forum Discussion
ottleydamian
Cirrus
CirrusF5 ciphersuite syntax
Help me understand F5 ciphersuite syntax please: https://support.f5.com/csp/article/K13400
In the client-ssl ciphers syntax the article states that if you want to support TLS1.0 and SSL3.0 do th...
Greetings,
I parsed through the responses and don't see that anyone's mentioned this yet, apologies if this has already been mentioned:
Note: When you use the ! symbol preceding a cipher, the SSL profile permanently removes the cipher from the cipher list, even if it is explicitly stated later in the cipher string. When you use the - symbol preceding a cipher, the SSL profile removes the cipher from the cipher list, but it can be added back to the cipher list if there are later options that allow it. For more information about building and viewing custom cipher lists, refer to K15194: Overview of the BIG-IP SSL/TLS cipher suite.
https://support.f5.com/csp/article/K13171
Hope this is helpful, thank you!
Kevin
ottleydamianCirrus
CirrusThanks Kevin,
Actually the ! symbol was the syntax that I did understand. What was tripping me up before was if I only wanted TLSv1.2 ie. no sslv3, no tlsv1.0 and no tlsv1.1 why did the syntax in the F5 article have "-TLSv1:-SSLv3". I was expecting "!TLSv1:!SSLv3" etc.
But though I can't fully understand all the intricacies of why it works, I at least am confident that it does work.