Roadwarrior <b>carol</b> proposes  to gateway <b>moon</b> the ESP cipher suite
<b>AES_256/AES_XCBC_MAC</b> by defining <b>esp=aes256-aesxcbc-modp2048</b>
in ipsec.conf. A ping from <b>carol</b> to <b>alice</b> successfully checks
the established tunnel.