How the NP7 hash-config affects sessions that require session helpers or ALGs

Setting hash-config to src-ip is required to offload traffic that requires session helpers or application layer gateways (ALGs) (for example, FTP, TFTP, SIP, MGCP, H.323, PPTP, L2TP, ICMP Error/IP-options, PMAP, TNS, DCE-RPC, RAS, and RSH).

On a FortiGae with hyperscale firewall features enabled, session helper and ALG traffic should be processed by normal VDOMs and not by hyperscale firewall VDOMs. Traffic that requires session helpers or ALGs is not compatible with hyperscale firewall functionality since the initial packets of a new session must be processed by the CPU. As well, some traffic that requires ALGs, for example SIP traffic, also requires a security profile and security profiles are not compatible with hyperscale firewall functionality.

Session helper and ALG traffic can be partially offloaded by NP7 processors. For example, SIP setup sessions are processed by the CPU, but the RTP and RTCP sessions that result from SIP setup sessions can be accelerated by NP7 processors.