Maximum-Receive-Unit (MRU)

   Description

      This Configuration Option may be sent to inform the peer that the
      implementation can receive larger packets, or to request that the
      peer send smaller packets.

      The default value is 1500 octets.  If smaller packets are
      requested, an implementation MUST still be able to receive the
      full 1500 octet information field in case link synchronization is
      lost.