Re: DNS-AS RRTYPE PARAMETER ALLOCATION

"Wolfgang Riedel (wriedel)" <[email protected]> Sat, 13 Feb 2016 20:36:38 +0000
Newsgroups gmane.ietf.dnsext
Message-ID <[email protected]>
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Hi Ray,

may thanks for your reply.

I consultant with some colleagues and were good with filing a new =
request and replace the mnemonic =3D DNSAS with mnemonic =3D AVC as you =
suggested.
Also some answer to your question inline.

For all other on list, if you=E2=80=99re looking for more details on =
DNS-AS please have look at http://dns.as.org

Thank you,
Wolfgang


> On 10 Feb 2016, at 13:26PM, Ray Bellis <[email protected]> wrote:
>=20
> Wolfgang,
>=20
> I've been appointed as the designated expert to review your RRTYPE
> application per RFC 6895.
>=20
> In principle the application is OK, and it's highly desirable that you
> avoid use of TXT.
>=20
> Within my remit however I do have some concerns over the name of the =
RRTYPE:
>=20
> - the term "authoritative" has a particular meaning in the DNS
>  protocol, and "authoritative source" is a commonly used term
>  too.  Typing "dns authoritative source" into Google already
>  produces 75,000 results, none that I could see relating to
>  your project.

yes I agree and we have chosen the wording by intension to outline that =
we leverage the authoritative name server as a sigle source of truth for =
application metadata.

> - using "DNS" within the RRTYPE name seems redundant - we=E2=80=99re =
already in the DNS.

agree

> - the letters "AS" are also commonly used to refer to a BGP =
"Autonomous System=E2=80=9D.

agree

> [FWIW, when I first saw your requested mnemonic in the subject of your
> application I was expecting to see an application for an RRTYPE to
> represent a BGP AS number!]

it=E2=80=99s not so far off given that BGP expresses routing policy =
intend and DNS-AS metadata for application policy intend

> Also missing is any explicit statement that the intended wire and
> presentation format are identical to that of a TXT record.
> Consideration should also be given to what happens if the data does =
not
> fit within a single 255 octet "character-string" sub-field.

OK will adress this

> Incidentally, the "CISCO-CLS=3D" prefix in the RDATA would appear to =
be
> redundant when you get your own RRTYPE, and if it's expected that =
other
> vendors would use this then I suggest that you either omit it or use
> something more neutral.

yes good catch and I agree and will remove this

> At a higher level I have concerns about the overall use case  that
> should be addressed if you plan to document "DNS Authoritative Source"
> in an Internet Draft (although I don't expect these to be a factor in =
my
> decision as they're probably outside the scope of RFC 6895):

at this time there are not plans to submit this as an Internet Draft

> -  why DNS?

Readily available tool - already leveraged to identify an application by =
DNS-NAME

> How does the client know what domain names are supposed to be looked =
up?

it=E2=80=99s a function of an DNS-AS client which snoop DNS request as =
an trigger and raises it=E2=80=99s own query for a DNS-AS Resource =
Record to get the metadata to enforce policy later

> -  if the "Application Name" is the primary key, why not incorporate
>   that into the domain name?

This =E2=80=98could be done=E2=80=99 - but most customers don=E2=80=99t =
or won=E2=80=99t always identify what application is running on a server =
via it=E2=80=99s FQDN.

>  - (corollary) is it expected that a client would want to (or even
>    be allowed to) obtain information about all known applications at
>    a domain with a single DNS query?

there is nothing confidential inside a DNS-AS resource record.
The key is that it it authoritative!

> -  what about DNS Security?  What happens in your SDN if someone
>   manages to poison a record?

what happens if I haven't done my homework and didn=E2=80=99t secure and =
harden my DNS infrastructure ;-)
If DNS is compromised you have bigger problems than how a network =
element chooses mark and service (queue) for a given application...

> The decision will be reached within two weeks of today, and before
> approval the explicit linking to the TXT record format must be =
resolved.
>=20
> I urge you to reconsider your project name of "DNS Authoritative =
Source"
> as being a clash with existing terminology. I'm not currently inclined
> to reject the application on that basis of the requested DNSAS =
mnemonic,
> but welcome community feedback on that issue.

yes will file a new request for mnemonic =3D AVC

>=20
> kind regards,
>=20
> Ray Bellis


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class=3D"">Hi Ray,<div class=3D""><br class=3D""></div><div class=3D"">may=
 thanks for your reply.</div><div class=3D""><br class=3D""></div><div =
class=3D"">I consultant with some colleagues and were good with filing a =
new request and replace the mnemonic =3D DNSAS with mnemonic =3D AVC as =
you suggested.</div><div class=3D"">Also some answer to your question =
inline.</div><div class=3D""><br class=3D""></div><div class=3D"">For =
all other on list, if you=E2=80=99re looking for more details on DNS-AS =
please have look at <a href=3D"http://dns.as.org" =
class=3D"">http://dns.as.org</a><br class=3D""><div class=3D""><br =
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class=3D"Apple-style-span" style=3D"border-collapse: separate; =
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class=3D""><span class=3D"Apple-style-span" style=3D"border-collapse: =
separate; border-spacing: 0px;"><div style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><span class=3D"Apple-style-span" style=3D"border-collapse: =
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font-size: 10px;" class=3D""><font class=3D""><div class=3D""><span =
style=3D"font-size: 10px; text-align: -webkit-auto;" class=3D"">Thank =
you,</span></div><font class=3D"Apple-style-span" =
color=3D"#00000000">Wolfgang</font></font></div><div style=3D"font-size: =
10px;" class=3D""><br =
class=3D""></div></span></div></span></div></span></div></span></div></spa=
n></font></div><div style=3D"font-variant: normal; letter-spacing: =
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9px;" class=3D""><font =
class=3D"Apple-style-span"></font></span></div></span></div></span></div><=
/span></div></span></div></font></span></div></div></div></div></div></div=
></div></div></div></div></div></div></div></div></div></div></div></div><=
/div></div></div></div>
</div>
<br class=3D""><div><blockquote type=3D"cite" class=3D""><div =
class=3D"">On 10 Feb 2016, at 13:26PM, Ray Bellis &lt;<a =
href=3D"mailto:[email protected]" class=3D"">[email protected]</a>&gt; =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"">Wolfgang,<br class=3D""><br class=3D"">I've been appointed as =
the designated expert to review your RRTYPE<br class=3D"">application =
per RFC 6895.<br class=3D""><br class=3D"">In principle the application =
is OK, and it's highly desirable that you<br class=3D"">avoid use of =
TXT.<br class=3D""><br class=3D"">Within my remit however I do have some =
concerns over the name of the RRTYPE:<br class=3D""><br class=3D"">- the =
term "authoritative" has a particular meaning in the DNS<br class=3D""> =
&nbsp;protocol, and "authoritative source" is a commonly used term<br =
class=3D""> &nbsp;too. &nbsp;Typing "dns authoritative source" into =
Google already<br class=3D""> &nbsp;produces 75,000 results, none that I =
could see relating to<br class=3D""> &nbsp;your project.<br =
class=3D""></div></div></blockquote><div><br class=3D""></div><div>yes I =
agree and we have chosen the wording by intension to outline that we =
leverage the authoritative name server as a sigle source of truth for =
application metadata.</div><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D""><div class=3D"">- using "DNS" within the =
RRTYPE name seems redundant - we=E2=80=99re&nbsp;already in the DNS.<br =
class=3D""></div></div></blockquote><div><br =
class=3D""></div>agree</div><div><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D""><div class=3D"">- the letters "AS" are also =
commonly used to refer to a BGP&nbsp;"Autonomous System=E2=80=9D.<br =
class=3D""></div></div></blockquote><div><br =
class=3D""></div><div>agree</div><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D""><div class=3D"">[FWIW, when I first saw your =
requested mnemonic in the subject of your<br class=3D"">application I =
was expecting to see an application for an RRTYPE to<br =
class=3D"">represent a BGP AS number!]<br =
class=3D""></div></div></blockquote><div><br class=3D""></div><div>it=E2=80=
=99s not so far off given that BGP expresses routing policy intend and =
DNS-AS metadata for application policy intend</div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><div =
class=3D"">Also missing is any explicit statement that the intended wire =
and<br class=3D"">presentation format are identical to that of a TXT =
record.<br class=3D"">Consideration should also be given to what happens =
if the data does not<br class=3D"">fit within a single 255 octet =
"character-string" sub-field.<br =
class=3D""></div></div></blockquote><div><br class=3D""></div><div>OK =
will adress this</div><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D""><div class=3D"">Incidentally, the =
"CISCO-CLS=3D" prefix in the RDATA would appear to be<br =
class=3D"">redundant when you get your own RRTYPE, and if it's expected =
that other<br class=3D"">vendors would use this then I suggest that you =
either omit it or use<br class=3D"">something more neutral.<br =
class=3D""></div></div></blockquote><div><br class=3D""></div><div>yes =
good catch and I agree and will remove this</div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><div =
class=3D"">At a higher level I have concerns about the overall use case =
&nbsp;that<br class=3D"">should be addressed if you plan to document =
"DNS Authoritative Source"<br class=3D"">in an Internet Draft (although =
I don't expect these to be a factor in my<br class=3D"">decision as =
they're probably outside the scope of RFC 6895):<br =
class=3D""></div></div></blockquote><div><br class=3D""></div><div>at =
this time there are not plans to submit this as an Internet =
Draft</div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D""><div class=3D"">- &nbsp;why DNS? =
&nbsp;</div></div></blockquote><div><br class=3D""></div><div>Readily =
available tool - already leveraged to identify an application by =
DNS-NAME</div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D""><div class=3D"">How does the client know what domain names =
are&nbsp;supposed to be looked up?<br =
class=3D""></div></div></blockquote><div><br class=3D""></div><div>it=E2=80=
=99s a function of an DNS-AS client which snoop DNS request as an =
trigger and raises it=E2=80=99s own query for a DNS-AS Resource Record =
to get the metadata to enforce policy later</div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><div =
class=3D"">- &nbsp;if the "Application Name" is the primary key, why not =
incorporate<br class=3D""> &nbsp;&nbsp;that into the domain name?<br =
class=3D""></div></div></blockquote><div><br class=3D""></div><div>This =
=E2=80=98could be done=E2=80=99 - but most customers don=E2=80=99t or =
won=E2=80=99t always identify what application is running on a server =
via it=E2=80=99s FQDN.&nbsp;</div><br class=3D""><blockquote type=3D"cite"=
 class=3D""><div class=3D""><div class=3D""> &nbsp;- (corollary) is it =
expected that a client would want to (or even<br class=3D""> =
&nbsp;&nbsp;&nbsp;be allowed to) obtain information about all known =
applications at<br class=3D""> &nbsp;&nbsp;&nbsp;a domain with a single =
DNS query?<br class=3D""></div></div></blockquote><div><br =
class=3D""></div><div>there is nothing confidential inside a DNS-AS =
resource record.&nbsp;</div><div>The key is that it it =
authoritative!</div><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D""><div class=3D"">- &nbsp;what about DNS =
Security? &nbsp;What happens in your SDN if someone<br class=3D""> =
&nbsp;&nbsp;manages to poison a record?<br =
class=3D""></div></div></blockquote><div><br class=3D""></div><div>what =
happens if I haven't done my homework and didn=E2=80=99t secure and =
harden my DNS infrastructure ;-)</div><div>If DNS is compromised you =
have bigger problems than how a network element chooses mark and service =
(queue) for a given application...</div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D""><div class=3D"">The decision =
will be reached within two weeks of today, and before<br =
class=3D"">approval the explicit linking to the TXT record format must =
be resolved.<br class=3D""><br class=3D"">I urge you to reconsider your =
project name of "DNS Authoritative Source"<br class=3D"">as being a =
clash with existing terminology. I'm not currently inclined<br =
class=3D"">to reject the application on that basis of the requested =
DNSAS mnemonic,<br class=3D"">but welcome community feedback on that =
issue.<br class=3D""></div></div></blockquote><div><br =
class=3D""></div><div>yes will file a new request for mnemonic =3D =
AVC</div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D""><div class=3D""><br class=3D"">kind regards,<br class=3D""><br =
class=3D"">Ray Bellis<br class=3D""></div></div></blockquote></div><br =
class=3D""></div></body></html>=

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