This is from the source code:
---
/*
* The other error types depend on whether or not the
* socket is UDP or TCP. If it is UDP, some errors
* that we expect to be fatal under TCP are merely
* annoying, and are really soft errors.
*
* However, these soft errors are still returned as
* a status.
*/
isc_sockaddr_format(&dev->address, addrbuf, sizeof(addrbuf));
isc__strerror(send_errno, strbuf, sizeof(strbuf));
-> UNEXPECTED_ERROR(__FILE__, __LINE__, "internal_send: %s: %s",
addrbuf, strbuf);
dev->result = isc__errno2result(send_errno);
inc_stats(sock->manager->stats,
sock->statsindex[STATID_SENDFAIL]);
return (DOIO_HARD);
---
Regards,
Jie
* ho...@iij.ad.jp <ho...@iij.ad.jp> wrote:
> Date: Thu, 7 Jun 2018 10:23:48 +0900
> From: ho...@iij.ad.jp
> To: Bob Harold <rharo...@umich.edu>
> CC: "bind-users@lists.isc.org" <bind-users@lists.isc.org>, ho...@iij.ad.jp
> Subject: Re: socket.c:2135: unexpected error:
> X-Mailer: Becky! ver. 2.70 [ja]
>
>
> On Tue, 5 Jun 2018 12:48:53 -0400
> Bob Harold <rharo...@umich.edu> wrote:
>
> > On Mon, Jun 4, 2018 at 10:57 PM <ho...@iij.ad.jp> wrote:
> >
> > >
> > > Hi,
> > >
> > > After upgrading BIND from 9.9.9-P5 to 9.11.3., the following messages
> > > have been displayed continuously in the file /var/log/messages as below.
> > >
> > > ---------
> > > May 29 02:36:50 dns01 nanny[5609]: debug start 1
> > > May 29 02:37:08 dns01 named[1679]: socket.c:2135: unexpected error:
> > > May 29 02:37:08 dns01 named[1679]: internal_send: [global IPv6
> > > address]#38306: Invalid argument
> > > May 29 02:37:20 dns01 nanny[5617]: debug start 1
> > > May 29 02:37:24 dns01 named[1679]: socket.c:2135: unexpected error:
> > > May 29 02:37:24 dns01 named[1679]: internal_send: [global IPv6
> > > address]#36987: Invalid argument
> > > May 29 02:37:47 dns01 named[1679]: socket.c:2135: unexpected error:
> > > May 29 02:37:47 dns01 named[1679]: internal_send: [global IPv6
> > > address]#35862: Invalid argument
> > > May 29 02:37:48 dns01 named[1679]: socket.c:2135: unexpected error:
> > > May 29 02:37:48 dns01 named[1679]: internal_send: [global IPv6
> > > address]#39895: Invalid argument
> > > May 29 02:37:50 dns01 nanny[5632]: debug start 1
> > > May 29 02:38:00 dns01 named[1679]: socket.c:2135: unexpected error:
> > > May 29 02:38:00 dns01 named[1679]: internal_send: [global IPv6
> > > address]#38979: Invalid argument
> > > :
> > > ---------
> > >
> > > OS : Red Hat Enterprise Linux Server 6.5
> > >
> > > DNS service seems to be working fine, but I don't understand the cause
> > > and how to fix the errors.
> > >
> > > Any advice would be greatly appreciated.
> > >
> > >
> > > Regards,
> > > Hotta
> > >
> >
> > Just guessing, but it sounds like " [global IPv6 address]" is either
> > malformed, or it is expecting an IPv4 address.
> >
> > --
> > Bob Harold
>
> Thank you for advice.
> [global IPv6 address] looks like the right address.
> We did not know the cause of errors, so returned to the previous version
> on the production environment.
> After that we have tried various tests in our IPv6 testing environment,
> but it works fine without the same errors.
>
> --
> Hotta
>
>
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