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

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## Set the MTU for Use in PMTU Discovery

1. Enter Global Configuration mode.

       SEFOS# configure terminal

2. Set the MTU value for use in PMTU discovery.

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

   where:

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

   - `1500` is the MTU value.

3. Use the `ping` command to connect to host B from switch 1 with the packet sizing as 1800.

       SEFOS# ping ipv6 fec0::3333:0:10 size 1800

       ping6 fec0::3333:0:10 1800 bytes of data
       1800 bytes from fec0::3333:0:10 : icmp_seq = 0
       1800 bytes from fec0::3333:0:10 : icmp_seq = 1
       1800 bytes from fec0::3333:0:10 : icmp_seq = 2
       1800 bytes from fec0::3333:0:10 : icmp_seq = 3
       1800 bytes from fec0::3333:0:10 : icmp_seq = 4
        --- Ping Statistics ---
       5 Packets Transmitted, 5 Packets Received, 0% Packet Loss

4. On switch 1, review the MTU value.

       SEFOS# show ipv6 pmtu

       PMTU discovery is enabled

         Ipv6 Path MTU Table
        -----------------
       Destination     PMTU
       -----------     ----
       fec0::1111:0:01200

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