PMTU can use PING? #192
PMTU can use PING? #192
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DPLPMTUD would sometimes use ping frames. So, if I understand, a method using PING frames does not need the immediate ACK function, either one or the other is sufficient.
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Acknowledgement of PING frames is not immediate, but can be delayed by up to max_ack_delay. It makes sense to use an IMMEDIATE_ACK frame, so the sender can switch to using the larger MTU as early as possible. |
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I'm less sure, this is always a real advantage, the method would work with PING frames. I expect in most cases the important goal is to avoid black-holing traffic that has too large a size, not saving a fraction of an RTT. I think the PR should allow use with or without IMMEDIATE_ACK frame. |
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While potentially a PING frame could be used, it seems a bit out of scope for this document. However, maybe we should change the SHOULD to a MAY then? |
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MAY would also work - it would alert readers to this possibly being a problem and let them decide. I'm happy for this to be resolved as you see fit. |
fixes #190
DPLPMTUD would sometimes use ping frames. So, if I understand, a method using PING frames does not need the immediate ACK function, either one or the other is sufficient.