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Selection of SASL mechanism during SASL negotiation


Just wondering how the selction of the SASL mechanism works?

For example if a Server A advertises to B



How does B decide which machanism to select(obviously it would have to be one it supports,
but in the case where more than 1 is supported what happens). Is there some priority
or is the first supported mechanism selected?
Is the selection controlable through some config files, how would it be controlled?

And I doubth my next q is possible at the mo, but might as well ask, can I specify for connecting to a server C I will only negotiate KERBEROS_V4 if it is offered but for B I may except DIGEST-MD5&EXTERNAL.

Thanks in advance.