The value of vRtrIfIcmpV6PktTooBig specifies whether
packet-too-big ICMP messages should be sent. When it is set to
'true', ICMPv6 packet-too-big messages are generated by this
interface. When vRtrIfIcmpV6PktTooBig is set to 'false',
ICMPv6 packet-too-big messages are not sent.