拡張ICMPがRFC5837で公開
RFC 5837 – Extending ICMP for Interface and Next-Hop Identification
This memo defines a data structure that can be appended to selected
ICMP messages. The ICMP extension defined herein can be used to
identify any combination of the following: the IP interface upon
which a datagram arrived, the sub-IP component of an IP interface
upon which a datagram arrived, the IP interface through which the
datagram would have been forwarded had it been forwardable, and the
IP next hop to which the datagram would have been forwarded.
ICMPを使って、インタフェース名やIPv4/v6アドレス、MTU等の情報を取得できる仕様が、RFC5837で公開されました。
RFC5837の策定には、CiscoやJuniperのエンジニアも関わっていますので、実装されるのも早そうですね。