An errata patch for icmp6_linklocal has been released for OpenBSD 6.1.
When pinging an IPv6 link-local address, the reflected packet had ::1
as source address. The echo reply was ignored as it must be from the
link-local address.
Binary updates for the amd64 and i386 platforms are available via the
syspatch utility. A source code patch can be found on the respective
errata page:
https://www.openbsd.org/errata61.html
As this affects the kernel, a reboot will be needed after patching.
If IPv6 is not configured on your system, this issue does not affect you.
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