Load balancing

ChaCha20 and Poly1305 cipher suites added for SSL load balancing (264785)

FortiOS 5.4 adds support for ChaCha20 and Poly1305 for SSL load balancing (see RFC 7539 for information about ChaCha20 and Poly1305). You can use the following command to view the complete list of supported cipher suites:

config firewall vip edit <vip-name>

set type server-load-balance set server-type https

set ssl-algorithm custom config ssl-cipher-suites

edit 0

set cipher ?

In most configurations the matching cipher suite is automatically selected.

All of these cipher suites are available to all of FortiOS’s implementations of SSL but the complete list of supported cipher suites is only viewable using the above command.

You can also use the above command to limit the set of cipher suites that are available for a given SSL offloading configuration. For example, use the following command to limit an SSL load balancing configuration to use the three cipher suites that support ChaCha20 and Poly1305:

config firewall vip edit <vip-name>

set type server-load-balance set server-type https

set ssl-algorithm custom config ssl-cipher-suites

edit 1

set cipher TLS-ECDHE-RSA-WITH-CHACHA20-POLY1305-SHA256 next

edit 2

set cipher TLS-ECDHE-ECDSA-WITH-CHACHA20-POLY1305-SHA256 next

edit 3

set cipher TLS-DHE-RSA-WITH-CHACHA20-POLY1305-SHA256 end

end