BIND9 and AS112

Havard Eidnes he at uninett.no
Mon Oct 22 08:43:28 UTC 2018


Hi,

reviving an old thread with some new information:

> On Fri, Mar 09, 2018 at 12:32:41PM +0300,
>  Diarmuid O Briain <diarmuid at obriain.com> wrote 
>  a message of 122 lines which said:
>
>> Mar 09 08:11:43 as112 named[3787]: internal_send: 2620:4f:8000::42#53: Invalid argument
>> Mar 09 08:11:43 as112 named[3787]: internal_send: 192.175.48.42#53: Invalid argument
>
> I suspect that your machine is not configured for these IP
> addresses. See with ifconfig or ip addr show.

Diarmuid didn't say what platform he's running BIND on.  This may
make a difference wrt. a bug I recently stumbled over:

  https://gitlab.isc.org/isc-projects/bind9/issues/589

This will typically hit the BSD lineage of OSes (NetBSD in my
case), which will refuse to apply an IPv6 control header on a
socket used for IPv4.  The particular symptom is that attempts to
send a message over 1432 bytes in size over IPv4/UDP will cause
the above error message and the message to be dropped.

What's up with the IPv6 error message I do not know.

Best regards,

- Håvard


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