IP6 ping

Doug Hardie bc979 at lafn.org
Tue Feb 16 01:27:21 UTC 2021

I don't know if this is a feature or a bug.  On FreeBSD 9, the following ping worked:

ping6 -s 5000 -b 6000 fe80::213:72ff:fec3:180f%dc0

It had to be stopped, but it returned the number of ping responses received along with statistics.

With FreeBSD 12.2 and 13.0-BETA2, it returns 100% packet loss.  tcpdump shows that it properly fragments the data, sends it, the other end receives it and sends back the ACKs.  The ACKs are received, but somehow ping doesn't find out that the packets were received.

Without the -s and -b arguments, it works and you get 100% packets received.

Note, the -b argument has to be left off when sending from 13.0 as it is no longer supported.

-- Doug

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