On Tue, Jul 28, 2009 at 05:00:22AM -0400, Christopher Morrow wrote:
> it's 10 years old, from a single network link, in what I suspect was
> VBNS+, so not even today's internet (scale or applications or users or
> traffic levels or uses)
People might want to check "netstat -s" - on some OSes it displays
the number of datagrams with no checksum. From some machines I have
access to:
Datagrams with no csum Fraction
1643918434 1660 ~0.000001
1780472220 233156 ~0.00001
1335609090 918129 ~0.0007
4157989 931 ~0.0002
122783361 43532 ~0.0004
The second machine is a moderately busy DNS server. The third a
public NTP server. I don't think the counters have wrapped - I get
plausible looking pps numbers if I divide the datagrams by uptime.
Checking some other traces, I see about 21420/17253070 NTP packets
with no checksum. Of non-NTP, non-DNS traffic I see about half a
percent of UDP with no checksums. A lot of this looks like either
port scans or people trying to use obsolete services like port 37.
David.
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