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* Verify tunnel MTU
RFC 7676 section "3.2. MTU Considerations"
Before activating a GRE tunnel and periodically thereafter, the GRE
ingress node MUST verify the tunnel's ability to carry a 1280-octet
IPv6 payload packet from ingress to egress, without fragmenting the
payload. Having executed those procedures, the GRE ingress node MUST
activate or deactivate the tunnel accordingly.
Implementation details regarding the above-mentioned verification
procedures are beyond the scope of this document. However, a GRE
ingress node can verify tunnel capabilities by sending a 1280-octet
IPv6 packet addressed to itself through the tunnel under test.
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