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From: Richard Tweed <rtweed@thoughtmachine.net>
Date: Mon, 15 Apr 2019 10:46:24 +0100
Message-ID: <CAG_gbDAeuKRGqgTRSUnqqpu6FQ8hqrNS-2ZpZJRarEFLs2o+Yw@mail.gmail.com>
Subject: Re: [alpine-user] Support request - Force DNS requests to go over TCP
To: Paul Bredbury <brebs@sent.com>
Cc: alpine-user@lists.alpinelinux.org
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Thanks, I'll check that out!

On Sat, 13 Apr 2019 at 10:40, Paul Bredbury <brebs@sent.com> wrote:

> For any non-trivial DNS, I recommend to use Unbound.
>
> If you really need TCP, it has an option:
>
> tcp-upstream: <yes or no>
> Enable or disable whether the upstream queries use TCP only for transport=
.
> Default is no. Useful in tunneling scenarios.
>
> On Fri, 2019-04-12 at 14:00 +0100, Richard Tweed wrote:
> > I've run into a situation where I need DNS resolution to always be over
> TCP rather than UDP due to AWS dropping DNS packets frequently enough to =
be
> a problem. On glibc based environments I can use
> > the use-vc option in the resolv.conf file.
> > http://man7.org/linux/man-pages/man5/resolv.conf.5.html
> > On Alpine this doesn't seem to be supported and I would love to hear an=
y
> suggestions about achieving this behaviour.
>
>

--=20

Richard Finlay Tweed

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<div dir=3D"ltr"><div dir=3D"ltr">Thanks, I&#39;ll check that out!</div><br=
><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sat, 1=
3 Apr 2019 at 10:40, Paul Bredbury &lt;<a href=3D"mailto:brebs@sent.com">br=
ebs@sent.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddin=
g-left:1ex">For any non-trivial DNS, I recommend to use Unbound.<br>
<br>
If you really need TCP, it has an option:<br>
<br>
tcp-upstream: &lt;yes or no&gt;=C2=A0 <br>
Enable or disable whether the upstream queries use TCP only for transport. =
Default is no. Useful in tunneling scenarios.<br>
<br>
On Fri, 2019-04-12 at 14:00 +0100, Richard Tweed wrote:<br>
&gt; I&#39;ve run into a situation where I need DNS resolution to always be=
 over TCP rather than UDP due to AWS dropping DNS packets frequently enough=
 to be a problem. On glibc based environments I can use<br>
&gt; the use-vc option in the resolv.conf file. <br>
&gt; <a href=3D"http://man7.org/linux/man-pages/man5/resolv.conf.5.html" re=
l=3D"noreferrer" target=3D"_blank">http://man7.org/linux/man-pages/man5/res=
olv.conf.5.html</a><br>
&gt; On Alpine this doesn&#39;t seem to be supported and I would love to he=
ar any suggestions about achieving this behaviour.<br>
<br>
</blockquote></div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr"=
 class=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><span><p =
dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:10pt"><s=
pan style=3D"background-color:transparent;color:rgb(0,0,0);font-family:Aria=
l;font-size:12pt;white-space:pre-wrap">Richard Finlay Tweed</span><br></p><=
p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt"><=
br></p></span></div></div></div></div></div>

<br>
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rial,sans-serif;font-size:12.8px;background-color:rgb(255,255,255);color:rg=
b(80,0,80)"><font size=3D"1" face=3D"arial, helvetica, sans-serif" color=3D=
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p; Wales.</font></div><div style=3D"font-family:arial,sans-serif;font-size:=
12.8px;background-color:rgb(255,255,255);color:rgb(80,0,80)"><font size=3D"=
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ont-size:12.8px;background-color:rgb(255,255,255);color:rgb(80,0,80)"><font=
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