The roadwarrior carol proposes 3DES_CBC encryption with HMAC_SHA1 authentication in the first place and AES_CBC_128 encryption with HMAC_SHA1 authentication in the second place for both the ISAKMP and IPsec SA. The gateway moon enforces ike=aes128-sha! for Phase 1 by using the strict flag '!', but will accept any other supported algorithm proposed by the peer for Phase 2 , even though moon defines itself esp=aes128-sha1 only.