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by cthalupa 3112 days ago
My third edit included a bit more on this - I'm closer to 600 bytes total than 1380. A few of them are sitting at closer to 80 bytes for a request+response for DNS, etc. With a quick while loop and tcpdump, I'm seeing the number as being off by about 2x from my testing.

My DNS numbers are all basically half his - all of my requests are sub 40 bytes, responses are all sub 80, some are sub 60. My NTP query and response packets are pretty close, though - sitting around 80 bytes for request and response.
1 comments
ktta 3112 days ago
Your DNS numbers are off because you aren't counting IP and UDP headers

See my edit - https://news.ycombinator.com/item?id=15912467

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cthalupa 3112 days ago
Even using -e and looking at length I'm still significantly under 1380 bytes.

dig/ntpq on osx.

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ktta 3112 days ago
Can you take a look at the edit and comment on where your numbers differ exactly? I tried to be as accurate as possible. I used the busybox_NTPD from https://busybox.net/downloads/binaries/
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