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CLI-based Configuration Guide - VPN

AR650, AR1600, and AR6100 V300R003

This document describes VPN features on the device and provides configuration procedures and configuration examples.
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(Optional) Configuring IKEv2 Packet Fragmentation

(Optional) Configuring IKEv2 Packet Fragmentation


During IKEv2 negotiation, if the length of an encrypted IKEv2 packet exceeds the MTU of the outbound interface of the device, the device fragments the IKEv2 packet for transmission. However, some network devices (such as firewalls and NAT devices) do not permit UDP fragments because of attack defense. As a result, IKEv 2 fragments are discarded and IKEv2 negotiation between the IKE peers fails. In this case, you need to configure IKEv2 packet fragmentation so that the IKEv2 packet longer than the MTU specified by mtu-size is fragmented before being encrypted. This configuration prevents the encrypted IKEv2 packet from being fragmented before transmission.


  1. Run system-view

    The system view is displayed.

  2. Run ike peer peer-name

    The IKE peer view is displayed.

  3. Run ikev2 fragmentation [ mtu mtu-size ]

    IKEv2 packet fragmentation is enabled.

    By default, IKEv2 packet fragmentation is disabled.

    IKEv2 packet fragmentation must be enabled on both ends. Otherwise, this function does not take effect.

Updated: 2019-04-12

Document ID: EDOC1100041799

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