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| Sun Ethernet Fabric Operating System ### IPv6 Administration Guide

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## Enable PMTU Discovery

1. Enter Global Configuration mode.

       SEFOS# configure terminal

2. Enable PMTU discovery.

   Type one of these commands.

       SEFOS(config)# ipv6 path mtu discover

       SEFOS(config)# ipv6 path mtu 2004::0 1500

   where:

   - `2400::0` is the prefix address.

   - `1500` is the MTU value.

3. Review the IPv6 PMTU status.

       SEFOS# show ipv6 pmtu

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