System Template

Use this template to configure system-level features.

Optimization

Field	Description
IP ID auto optimization	Enables any IP flow to automatically identify the outbound tunnel and gain optimization benefits. Enabling this option reduces the number of required static routing rules (route map policies).
TCP auto optimization	Enables any TCP flow to automatically identify the outbound tunnel and gain optimization benefits. Enabling this option reduces the number of required static routing rules (route map policies).
Flows and tunnel failure	If there are parallel tunnels and one fails, *Dynamic Path Control* determines where to send the flows. There are three options: fail-stick – When the failed tunnel comes back up, the flows do not return to the original tunnel. They stay where they are. fail-back – When the failed tunnel comes back up, the flows return to the original tunnel. disable – When the original tunnel fails, the flows are not routed to another tunnel.

Network Memory

Field	Description
Encrypt data on disk	Enables encryption of all the cached data on the disks. Disabling this option is not recommended.

Excess Flow Handling

Field	Description
Excess flow policy	Specifies what happens to flows when the appliance reaches its maximum capacity for optimizing flows. The default is to bypass flows. Or, you can choose to drop the packets.

NextHop Health Check

Field	Description
Enable Health check	Activates pinging of the next hop router.
Retry count	Specifies the number of ICMP echoes to send without receiving a reply before declaring that the link to the WAN next hop router is down.
Interval	Specifies the number of seconds between each ICMP echo sent.
Hold down count	If the link has been declared down, this specifies how many successful ICMP echoes are required before declaring that the link to the next hop router is up.

Miscellaneous

Field	Description
SSL optimization for non-IPSec tunnels	Specifies whether the appliance should perform SSL optimization when the outbound tunnel for SSL packets is not encrypted (for example, a GRE or UDP tunnel). To enable Network Memory for encrypted SSL-based applications, you must provision server certificates by using the Orchestrator. This activity can apply to the entire distributed network of EdgeConnect appliances or just to a specified group of appliances.
Bridge Loop Test	Only valid for virtual appliances. When enabled, the appliance can detect bridge loops. If it detects a loop, the appliance stops forwarding traffic and raises an alarm. Appliance alarms include recommended actions.
Always send pass-through traffic to original sender	If the tunnel goes down when using WCCP and PBR, traffic that was intended for the tunnel is sent back the way it came.
Enable default DNS lookup	Enables the default DNS server to be included with other configured DNS servers for associating cloud portal domain names to network IP addresses.
Enable HTTP/HTTPS snooping	Enables a more granular application classification of HTTP/HTTPS traffic by inspection of the HTTP/HTTPS header, Host. This is enabled by default.
Quiescent tunnel keep alive time	Specifies the rate at which to send keep alive packets after a tunnel has become idle (quiescent mode). The default is 60 seconds.
UDP flow timeout	Specifies how long to keep the UDP session open after traffic stops flowing. The default is 120 seconds (2 minutes).
Non-accelerated TCP Flow Timeout	Specifies how long to keep the TCP session open after traffic stops flowing. The default is 1800 seconds (30 minutes).
Maximum TCP MSS	Maximum Segment Size. The default value is 9000 bytes. This ensures that packets are not dropped for being too large. You can adjust the value (500 to 9000) to lower a packet’s MSS.
NAT-T keep alive time	If a device is behind a NAT, this specifies the rate at which to send keep alive packets between hosts to keep the mappings in the NAT device intact.
Tunnel Alarm Aggregation Threshold	Specifies the number of alarms to allow before alerting the tunnel alarm.
Maintain end-to-end overlay mapping	Enforces the same overlay to be used end-to-end when traffic is forwarded on multiple nodes.
IP Directed Broadcast	Allows an entire network to receive data that only the target subnet initially receives.
Allow WAN to WAN routing	Redirects inbound LAN traffic back to the WAN.