Supported in rhel 6:
Ciphers aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,arcfour
MACs hmac-sha1,hmac-ripemd160
Supported in rhel 7:
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-ripemd160-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-512,hmac-sha2-256,hmac-ripemd160,umac-128@openssh.com
These examples are meant for sysadmins who have done this before, as an easily copy-pastable example, not for newbies who have no idea what all this means. Research what you are doing and think before you act. Be careful when reloading or restarting your sshd daemon, make sure you can access the console in case something goes terribly wrong! Verpruts het niet zegmaar.
source: https://cipherli.st/ and https://access.redhat.com/solutions/420283 and http://www.cyberciti.biz/faq/howto-openssh-client-security-update-cve-0216-0777-cve-0216-0778/