I guess that wireshark is not up to date.
Integrity Algorithm no 12 is defined in RFC4868 as

AUTH_HMAC_SHA2_256_128

The RFC was published in May 2007. I guess this Integrity Algorithm is 
unknown to wireshark. That's why it displays "UNKOWN-INTEGRITY-ALG".

What kind of security gateway are you using? Do you have any log files?

Jessie Liu wrote:
> Hi all,
>      I got the problem that client sends IKE_SA_INIT message to security 
> gateway, but security gateway did not respond.
>     so i capture the message using ethereal and found that in IKE_SA_INIT 
> message UNKNOWN -INTEGRITY-ALG occured. even if i specify the encryption and 
> integirty algorithm in ipsec.conf by using ike=aes_cbc-hmac_sha1_96, 
> UNKNOWN -INTEGRITY-ALG  still appeared in the IKE_SA_INIT message. And this 
> is the root cause that security gateway did not responed?? 
> and how to remove this? 
>  
> attached please find the ethereal file.

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