Configuration Templates : Tunnels Template

Tunnels Template
Use this template to assign and manage tunnel properties.
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Applying tunnel templates does not create new tunnels. To create tunnels, use Tab > Tunnels.
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Tunnel templates can be applied to any appliances (with or without tunnels). However, only existing tunnels can accept the template settings. To enable an appliance to apply these same settings to future tunnels, select Make these the Defaults for New Tunnels.
General
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Admin State brings the tunnel Up or Down.
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Mode determines whether the tunnel is udp, gre, or ipsec. If used, IPSec must be enabled at both ends of the tunnel.
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IPSec Preshared Key is a shared, secret string of Unicode characters that is used for authentication of an IPSec connection between two parties.
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IPSec Anti-replay window provides protection against an attacker duplicating encrypted packets by assigning a unique sequence number to each encrypted packet. The decryptor keeps track of which packets it has seen on the basis of these numbers. The default window size is 64 packets.
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UDP destination port is used in UDP mode. Accept the default value unless the port is blocked by a firewall.
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UDP flows is the number of flows over which to distribute tunnel data. Accept the default.
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Auto Max BW Enabled allows the appliances to auto-negotiate the maximum tunnel bandwidth.
Packet
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Coalescing Enabled allows the appliance to coalesce smaller packets into larger packets.
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Coalescing Wait is the number of milliseconds that the appliance should hold packets while attempting to coalesce smaller packets into larger ones.
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Reorder Wait is the number of milliseconds to allow for out-of-order packets to reorder. The default value is 100 ms.
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FEC (Forward Error Correction) can be set to enable, disable, and auto.
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FEC Ratio is an option when FEC is set to auto, that specifies the maximum ratio. The options are 1:2, 1:5, 1:10, or 1:20.
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Auto Discover MTU Enabled allows an appliance to determine the best MTU to use.
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MTU (bytes) (Maximum Transmission Unit) is the largest possible unit of data that can be sent on a given physical medium. For example, the MTU of Ethernet is 1500 bytes. Silver Peak provides support for MTUs up to 9000 bytes.
Tunnel Health
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Retry Count is the number of failed keep-alive messages that are allowed before the appliance brings the tunnel down.
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DSCP determines which DSCP marking the keep-alive messages should use.

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