According to RFC 2516, PPPoE, the Maximum-Receive-Unit (MRU) option MUST
NOT be negotiated to a larger size than 1492. If PPPoE implementations
actually negotiated an MRU size of 1492 bytes, we would not have an
issue. However, many implementations of PPPoE servers only support an
MTU of about 1100 bytes, i.e. less than the minimal MTU allowed by IPv6.

What should we do?

-- Christian Huitema
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