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Diameter Message Maximum Length

+3 votes
1,347 views

I have a couple of questions about maximum message size in Diameter.

A Diameter message header has a 3 byte length indicator, so a maximum message length of 16777215. I don't see any way for Diameter node to advertise support for a smaller message length. Does that mean that a node is expected to support a message length up to 0xffffff? Or is it free to impose its own upper limit and reject (send an error) if the message is too long?

Meanwhile, in RFC6083 (DTLS/SCTP):
However, the following limitations still apply:

The maximum user message size is 2^14 bytes, which is the DTLS limit.

Am I reading this correctly that this limits Diameter message lengths to 2^14 when using DTLS/SCTP? Or is there some kind of workaround to this limitation?

posted Aug 8, 2014 by anonymous

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