nanog mailing list archives

Re: QUIC, Connection IDs and NAT


From: "John Levine" <johnl () iecc com>
Date: 31 May 2021 23:50:54 -0400

It appears that Robert Brockway <robert () timetraveller org> said:
Does the existence of Connection IDs separate from IP mean that 
the host/IP contention ratio in CGNAT can be higher?  IE, can a single 
CGNAT device provide Internet access for a greater number of end-users?

No, QUIC runs over UDP which runs over IP.  QUIC replaces the TCP sessions that a web
browser uses but the device is still doing all of the other IP stuff that it does.

I could imagine that the connection ID might slightly increase the load on a NAT since a device
might be hopping back and forth between networks, e.g. mobile and wifi, and be considered a new NAT
client each time it does.


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