[pim] Re: [Shepherding AD review] review of draft-ietf-p im-gaap-17

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Thanks Stig, We will add "The assigned port number should be greater than
1023."

mike

On Mon, Jul 20, 2026 at 10:17=E2=80=AFAM Stig Venaas <[email protected]> wrot=
e:

> Hi all
>
> Regarding ICMP vs UDP. I believe it is important that applications
> running without special privileges can participate in GAAP. That
> requires having UDP on a port > 1023. I'm realizing the draft should
> explicitly request a port > 1023. ICMP is not possible.
>
> Regards,
> Stig
>
> On Sat, Jul 18, 2026 at 12:38=E2=80=AFPM Dino Farinacci <farinacci@gmail.=
com>
> wrote:
> >
> > >> Why UDP and not ICMP? Isn't GAAP in its nature "internet control"
> > >> traffic? Wouldn't GAAP have it easier with adoption, too, if it
> > >> were an ICMP type, especially with RFC 4890 (Recommendations for
> > >> Filtering ICMPv6 Messages in Firewalls)?
> > >
> > > ICMP has no port concept, so it can't support the NAT/firewall
> traversal model GAAP already relies on (destination-port filtering, per
> section 4). A new ICMP type would also need its own registry process and
> ICMP is filtered/rate-limited at least as often as UDP in practice.
> >
> > One would argue architecturally this functionality would belong to
> IGMP/MLD. But that train has left the station. And since these are
> "single-hop" protocols, it would be the wrong place.
> >
> > Single-hop, or link-local, multicast is a solved problem for discoverin=
g
> resources because the media allows you to do it. GAAP was designed for
> layer-3 mutlicast across the Internet.
> >
> > Dino
> >
> > _______________________________________________
> > pim mailing list -- [email protected]
> > To unsubscribe send an email to [email protected]
>

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<div dir=3D"ltr"><div>Thanks Stig, We will add &quot;The assigned port numb=
er should be greater than 1023.&quot;</div><div><br></div><div>mike</div><b=
r><div class=3D"gmail_quote gmail_quote_container"><div dir=3D"ltr" class=
=3D"gmail_attr">On Mon, Jul 20, 2026 at 10:17=E2=80=AFAM Stig Venaas &lt;<a=
 href=3D"mailto:[email protected]">[email protected]</a>&gt; wrote:<br></div><b=
lockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-le=
ft:1px solid rgb(204,204,204);padding-left:1ex">Hi all<br>
<br>
Regarding ICMP vs UDP. I believe it is important that applications<br>
running without special privileges can participate in GAAP. That<br>
requires having UDP on a port &gt; 1023. I&#39;m realizing the draft should=
<br>
explicitly request a port &gt; 1023. ICMP is not possible.<br>
<br>
Regards,<br>
Stig<br>
<br>
On Sat, Jul 18, 2026 at 12:38=E2=80=AFPM Dino Farinacci &lt;<a href=3D"mail=
to:[email protected]" target=3D"_blank">[email protected]</a>&gt; wrote=
:<br>
&gt;<br>
&gt; &gt;&gt; Why UDP and not ICMP? Isn&#39;t GAAP in its nature &quot;inte=
rnet control&quot;<br>
&gt; &gt;&gt; traffic? Wouldn&#39;t GAAP have it easier with adoption, too,=
 if it<br>
&gt; &gt;&gt; were an ICMP type, especially with RFC 4890 (Recommendations =
for<br>
&gt; &gt;&gt; Filtering ICMPv6 Messages in Firewalls)?<br>
&gt; &gt;<br>
&gt; &gt; ICMP has no port concept, so it can&#39;t support the NAT/firewal=
l traversal model GAAP already relies on (destination-port filtering, per s=
ection 4). A new ICMP type would also need its own registry process and ICM=
P is filtered/rate-limited at least as often as UDP in practice.<br>
&gt;<br>
&gt; One would argue architecturally this functionality would belong to IGM=
P/MLD. But that train has left the station. And since these are &quot;singl=
e-hop&quot; protocols, it would be the wrong place.<br>
&gt;<br>
&gt; Single-hop, or link-local, multicast is a solved problem for discoveri=
ng resources because the media allows you to do it. GAAP was designed for l=
ayer-3 mutlicast across the Internet.<br>
&gt;<br>
&gt; Dino<br>
&gt;<br>
&gt; _______________________________________________<br>
&gt; pim mailing list -- <a href=3D"mailto:[email protected]" target=3D"_blank">=
[email protected]</a><br>
&gt; To unsubscribe send an email to <a href=3D"mailto:[email protected]" =
target=3D"_blank">[email protected]</a><br>
</blockquote></div></div>

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