It is not supported by design because it is fundamentally insecure.

Only AEAD ciphers can have null authentication (because auth is builtin to the 
encryption protocol)

Paul

Sent from my iPhone

> On Oct 28, 2015, at 22:16, ChenHao <[email protected]> wrote:
> 
> Hi All:
> 
> On Solaris, I can disable "authentication" on phase 2 . But how to do that in 
> libreswan ?
> 
> I tried "phase2alg=3des-null;modp1024" .  libreswan can NOT recognize it at 
> all. 
> 
> Any idea ?
> 
> Thanks and regards
> 
> 
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