Tunnel Checksum - HP ProCurve 7102dl Reference Manual

Secure router sros command line interface

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SROS Command Line Interface Reference Guide

Tunnel Configuration Command Set

tunnel checksum

Use the tunnel checksum command to verify the checksum of incoming Generic Routing Encapsulation

(GRE) packets and to include a checksum on outgoing packets. Use the no form of this command to

disable checksum.

Syntax Description

No subcommands.

Default Values

By default, tunnel checksum is disabled.

Functional Notes

Both ends of the tunnel must have tunnel checksum enabled in order for the tunnel checksum feature to

function. When both endpoints have tunnel checksum enabled, a packet with an incorrect checksum will

be dropped. If the endpoints differ in their checksum configuration, all packets will still flow without any

checksum verification.

Usage Examples

The following example enables checksum on the tunnel 1 interface:

ProCurve(config)#interface tunnel 1

ProCurve(config-tunnel 1)#tunnel checksum

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When enabled, the tunnel checksum will be calculated for each outgoing GRE packet, with the result

stored in the GRE header. The checksum present bit will also be set in the header.

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