Hi,

> received proposals: ESP:AES_GCM_16_256/NO_EXT_SEQ
> configured proposals:
> ESP:AES_CBC_128/HMAC_SHA1_96/MODP_2048/NO_EXT_SEQ,
> ESP:3DES_CBC/HMAC_SHA1_96/MODP_1536/NO_EXT_SEQ,
> ESP:AES_CBC_128/AES_CBC_192/AES_CBC_256/3DES_CBC/BLOWFISH_CBC_256/HMAC_SHA1_96/AES_XCBC_96/HMAC_MD5_96/NO_EXT_SEQ
> no acceptable proposal found

Your client proposes a single algorithm for ESP, aes256gcm16. This
algorithm is not part of our default proposal, you'll have to configure
it using:

  esp=aes256gcm16!

Make sure that your kernel supports GCM mode, most recent kernels should
have it included.

Regards
Martin



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