Re: [quicwg/base-drafts] Prohibit IP fragmentation (#3280)

Jana Iyengar <> Fri, 06 December 2019 22:16 UTC

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Subject: Re: [quicwg/base-drafts] Prohibit IP fragmentation (#3280)
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janaiyengar commented on this pull request.

> @@ -3471,6 +3471,9 @@ Datagrams containing Initial packets MAY exceed 1200 bytes if the client
 believes that the Path Maximum Transmission Unit (PMTU) supports the size that
 it chooses.
+UDP datagrams MUST NOT be fragmented at the IP layer.  In IPv4

That is not a requirement we can enforce, and it does not seem to be within QUIC's purview to require it. How about the following: "QUIC implementations are expected to ensure that UDP Datagrams containing QUIC packets are not fragmented by the IP layer at the sender. In IPv4 {{...}}, the DF bit MUST be set to prevent fragmentation on the path."

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