Change Log 4 What's new 5 FortiOS 6.4.0 5 Supported RFCs 6 BGP 6 Cryptography 6 DHCP 7 Diffserv 8 DNS 8 ICMP 8 IP 9 IP multicast 9 IPsec 9 IPv4 9 IPv6 10 IS-IS 10 LDAP 11 NAT 11 OSPF 11 PPP 12 RADIUS 12 RIP 12 SFTP 12 SIP 13 SNMP 13 SSH 13 SSL 14 TCP 14 TLS 14 VPN 14无线15其他协议15其他15