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Configuring the Junos OS for IPv6 Path MTU Discovery
By default, path MTU (PMTU) discovery for IPv6 packets is enabled. To disable IPv6 PMTU discovery, include the no-ipv6-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:
[edit system internet-options]no-ipv6-path-mtu-discovery;
To configure IPv6 PMTU discovery timeout in minutes, include the ipv6-path-mtu-discovery-timeout statement at the [edit system internet-options] hierarchy level:
[edit system internet-options]ipv6-path-mtu-discovery-timeout minutes;
For details about IPv6 PMTU, see RFC 1981, Path MTU Discovery for IP version 6.
