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Re: [quicwg/base-drafts] Path Challenge Padding and Amplification Protection (#4257)

Nick Banks <notifications@github.com> Mon, 26 October 2020 15:42 UTC

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Date: Mon, 26 Oct 2020 08:42:21 -0700
From: Nick Banks <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Path Challenge Padding and Amplification Protection (#4257)
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My math:

- Assuming outgoing packets are 1 to 1 with incoming, that gives us a limit of 6 packets per second, per path
- Estimated the incoming UDP payload size to be 20 bytes
- The outgoing UDP payload size will be 1200 bytes

`Incoming Rate = (IPv4_Header_Size + UDP_Header_Size + 20) * 6 PKTS/SEC * PATHS_PER_CONN * CONNS`
`Outgoing Rate = (IPv4_Header_Size + UDP_Header_Size + 1200) * 6 PKTS/SEC * PATHS_PER_CONN * CONNS`

The amplification ratio is `(IPv4_Header_Size + UDP_Header_Size + 1200) /  (IPv4_Header_Size + UDP_Header_Size + 20)`, which is `1228 / 48 = 25.58333`. For incoming size of 28 bytes (8 byte CID) the number comes down to `21.93`.

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