Subject: [quicwg/base-drafts] Zero-length CIDs (#2086)

From: ekr <[email-masked]>
Date: Fri, 30 Nov 2018 18:16:24 -0800

```
If the Destination Connection ID is zero length and the packet matches the
address/port tuple of a connection where the host did not require connection
IDs, QUIC processes the packet as part of that connection. Endpoints MUST drop
packets with zero-length Destination Connection ID fields if they do not
correspond to a single connection.
```

How could this happen? The recipient knows if a given tuple is unique, so it shouldn't issue zero-length DCIDs for that tuple. 

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