Date: Thu, 24 Jul 2025 21:41:36 -0400 From: Karl Denninger <karl@denninger.net> To: freebsd-net@freebsd.org Subject: Re: rtadvd appears to ignore options set in /etc/rtadvd.conf Message-ID: <4a232361-90b0-483d-99d0-542a20462ce4@denninger.net> In-Reply-To: <39b8ceba-f6d4-4cb0-ab76-139255b7eb83@denninger.net> References: <2ceaf7ed-3a04-47f3-a1f1-9f8a40cab9ef@denninger.net> <nr9p9rsq-8o1p-3159-onqo-349p5q667864@yvfgf.mnoonqbm.arg> <bfb35bcc-f69b-40f9-adde-d6cb70d38246@denninger.net> <CAGv8uaoOJ5K3DghoXJHzGchTT_8xMdmOQyrQbFHJ73nUMB2fzw@mail.gmail.com> <1c7759d6-559e-4b2c-8bc0-a7a5fba28484@denninger.net> <39b8ceba-f6d4-4cb0-ab76-139255b7eb83@denninger.net>
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<p>The following handful-line patch (left the original assignments
commented out) causes rtadvd to conform to the man page *except*
you have to actually specify the interface to change pltime and
vltime; doing so in "default" is not picked up.</p>
<p>I initiated a bug report; is there a reason it shouldn't be this
way considering the man page says it should work and as below as I
describe there ARE circumstances where you really do want it to
behave like this.</p>
<p><font face=3D"monospace">diff --git a/usr.sbin/rtadvd/config.c
b/usr.sbin/rtadvd/config.c<br>
index a264858edaf7..ade01e4d39f7 100644<br>
--- a/usr.sbin/rtadvd/config.c<br>
+++ b/usr.sbin/rtadvd/config.c<br>
@@ -1092,8 +1092,13 @@ get_prefix(struct rainfo *rai)<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 __func__, ntopbuf, pfx->pfx_prefixlen,
ifi->ifi_ifname);<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 /* set ot=
her fields with protocol defaults */<br>
-=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pfx->p=
fx_validlifetime =3D
DEF_ADVVALIDLIFETIME;<br>
-=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pfx->p=
fx_preflifetime =3D
DEF_ADVPREFERREDLIFETIME;<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0int64_t v=
al64;<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0MAYHAVE(v=
al64, "vltime", DEF_ADVVALIDLIFETIME);<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pfx->p=
fx_validlifetime =3D val64;<br>
+//=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pfx->pfx_va=
lidlifetime =3D
DEF_ADVVALIDLIFETIME;<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0MAYHAVE(v=
al64, "pltime",
DEF_ADVPREFERREDLIFETIME);<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pfx->p=
fx_preflifetime =3D val64;<br>
+//=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pfx->pfx_pr=
eflifetime =3D
DEF_ADVPREFERREDLIFETIME;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 pfx->p=
fx_onlinkflg =3D 1;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 pfx->p=
fx_autoconfflg =3D 1;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 pfx->p=
fx_origin =3D PREFIX_FROM_KERNEL;</font><br>
<br>
</p>
<div class=3D"moz-cite-prefix">On 7/24/2025 10:59, Karl Denninger
wrote:<br>
</div>
<blockquote type=3D"cite"
cite=3D"mid:39b8ceba-f6d4-4cb0-ab76-139255b7eb83@denninger.net">
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DU=
TF-8">
<div class=3D"moz-cite-prefix">BTW the reason this behavior is
definitely bad news is the following:</div>
<div class=3D"moz-cite-prefix"><br>
</div>
<div class=3D"moz-cite-prefix">Note that if the delegated address
changes the host in question does get it marked "deprecated"
essentially immediately but it remains in the address table for
a very long time which is both pointless and, if the delegated
address changes on a relatively frequent basis (you'd hope it
doesn't but it might) you will wind up with a lot of deprecated
addresses. That's annoying but otherwise not a huge problem.<br>
<br>
HOWEVER, what is a significant problem is if IPv6 disappears
(that is, presume the gateway crashes or is rebooted and on
restart fails to get a new IPv6 delegation at all) -- since you
can't set the shorter valid time and have it work the system(s)
that previously got those SLACC addresses on your inside network
will attempt to connect outbound on them and fail since no
further rtadvd updates will show up to tell the box that the
delegation and route has changed.=C2=A0 This wildly damages
performance until said time expires, you reboot them or manually
remove the IPv6 SLACC address from the interface on each of
those devices -- and that potentially could be a very large
number of devices.</div>
<div class=3D"moz-cite-prefix"><br>
</div>
<div class=3D"moz-cite-prefix">On 7/24/2025 07:47, Karl Denninger
wrote:<br>
</div>
<blockquote type=3D"cite"
cite=3D"mid:1c7759d6-559e-4b2c-8bc0-a7a5fba28484@denninger.net">
<meta http-equiv=3D"Content-Type"
content=3D"text/html; charset=3DUTF-8">
<p>Nope -- no change:</p>
<p>07:44:23.810602 IP6 (hlim 255, next-header ICMPv6 (58)
payload length: 56) fe80::2e0:b4ff:fe68:f895 > ff02::1:
[icmp6 sum ok] ICMP6, router advertisement, length 56<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 hop limit 64, Flags [none], pref me=
dium, router
lifetime 1800s, reachable time 0ms, retrans timer 0ms<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 source link-address option (=
1), length 8 (1):
00:e0:b4:68:f8:95<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 prefix info option (3), leng=
th 32 (4):
2606:83c0:8000:1b00::/64, Flags [onlink, auto], valid time
2592000s, pref. time 604800s<br>
</p>
<p>Note that I cannot set an actual valid "address" in the
config file since I have no clue what it is in advance (it
comes off the delegation from the ISP of course)</p>
<p>This looks like a bug (starting rtadvd with verbose debugging
on in the foreground doesn't log any complaints -- it looks
like it just ignores the parameters.)</p>
<div class=3D"moz-cite-prefix">On 7/23/2025 23:26, John Hay wrote=
:<br>
</div>
<blockquote type=3D"cite"
cite=3D"mid:CAGv8uaoOJ5K3DghoXJHzGchTT_8xMdmOQyrQbFHJ73nUMB2fzw@mail.gmai=
l.com">
<meta http-equiv=3D"content-type"
content=3D"text/html; charset=3DUTF-8">
<div dir=3D"ltr">
<div>Hi Karl,</div>
<div><br>
</div>
<div>What if you use a =3D instead of the #? For example
:vltime=3D86400:</div>
<div><br>
</div>
<div>I set rdnss and dnssl using =3D and that works.</div>
<div><br>
</div>
<div>John</div>
<div><br>
</div>
</div>
<br>
<div class=3D"gmail_quote gmail_quote_container">
<div dir=3D"ltr" class=3D"gmail_attr">On Thu, 24 Jul 2025 at
01:38, Karl Denninger <<a
href=3D"mailto:karl@denninger.net" moz-do-not-send=3D"tru=
e"
class=3D"moz-txt-link-freetext">karl@denninger.net</a>>=
;
wrote:<br>
</div>
<blockquote class=3D"gmail_quote"
style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);=
padding-left:1ex">
<div>
<div>On 7/23/2025 16:47, Bjoern A. Zeeb wrote:<br>
</div>
<blockquote type=3D"cite">On Wed, 23 Jul 2025, Karl
Denninger wrote: <br>
<br>
Hi, <br>
<br>
(sorry I deleted the message as the tex/only part was
barely parsable). <br>
<br>
Can you, for testing, try adding an <br>
=C2=A0=C2=A0=C2=A0=C2=A0addr=3D"xxx:xxx:xxx:xxxx::":\ <=
br>
to one of your entries and see if the behaviour
changes? <br>
<br>
/bz=C2=A0<br>
<br>
</blockquote>
root@IpGw:/etc # more /etc/rtadvd.conf<br>
# Set the preferred lifetime to 10 minutes on advertised
prefixes.<br>
# All other parameters are default.<br>
#<br>
default:\<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 :vltime#86400:\<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 :pltime#3600:\<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 :prefixlen#64:addr=3D"xxx:xxx=
:xxx:xxxx::":<br>
ix1:\<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 :vltime#86400:\<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 :pltime#3600:\<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 :prefixlen#64:addr=3D"xxx:xxx=
:xxx:xxxx::":<br>
ix1.4:\<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 :vltime#86400:\<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 :pltime#3600:\<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 :prefixlen#64:<br>
<p>No change -- the announcement is going out on ix1
from the gateway.</p>
<p>On machine receiving the advertisements:</p>
<p>19:35:49.085297 IP6 (hlim 255, next-header ICMPv6
(58) payload length: 56) fe80::2e0:b4ff:fe68:f895 >
ff02::1: [icmp6 sum ok] ICMP6, router advertisement,
length 56<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 hop limit 64, Flags [none],=
pref medium,
router lifetime 1800s, reachable time 0ms, retrans
timer 0ms<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 source link-address =
option (1), length 8
(1): 00:e0:b4:68:f8:95<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 prefix info option (=
3), length 32 (4):
2606:83c0:8000:1b00::/64, Flags [onlink, auto], <b><u>v=
alid
time 2592000s, pref. time 604800s</u></b><br>
<br>
</p>
<br>
<div>-- <br>
Karl Denninger<br>
<a href=3D"mailto:karl@denninger.net" target=3D"_blank"=
moz-do-not-send=3D"true" class=3D"moz-txt-link-freete=
xt">karl@denninger.net</a><br>
<i>The Market Ticker</i><br>
<font size=3D"-2"><i>[S/MIME encrypted email preferred]=
</i></font></div>
</div>
</blockquote>
</div>
</blockquote>
<div class=3D"moz-signature">-- <br>
Karl Denninger<br>
<a href=3D"mailto:karl@denninger.net"
class=3D"moz-txt-link-freetext" moz-do-not-send=3D"true">karl=
@denninger.net</a><br>
<i>The Market Ticker</i><br>
<font size=3D"-2"><i>[S/MIME encrypted email preferred]</i></fo=
nt></div>
</blockquote>
<div class=3D"moz-signature">-- <br>
Karl Denninger<br>
<a href=3D"mailto:karl@denninger.net"
class=3D"moz-txt-link-freetext" moz-do-not-send=3D"true">karl@d=
enninger.net</a><br>
<i>The Market Ticker</i><br>
<font size=3D"-2"><i>[S/MIME encrypted email preferred]</i></font=
></div>
</blockquote>
<div class=3D"moz-signature">-- <br>
Karl Denninger<br>
<a href=3D"mailto:karl@denninger.net" class=3D"moz-txt-link-freetex=
t">karl@denninger.net</a><br>
<i>The Market Ticker</i><br>
<font size=3D"-2"><i>[S/MIME encrypted email preferred]</i></font><=
/div>
</body>
</html>
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--------------ms000000080903090702080705--
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