RE: RADB - BGP routing

[Benny Leong (HTHK - Senior Engineer II - iServices Development, NNSD)]

Does that mean registering with RADB guarantee global routability ? 


        ----------
        From:  Howard C. Berkowitz [SMTP:[EMAIL PROTECTED]]
        Sent:  Thursday, September 28, 2000 10:40 PM
        To:  [EMAIL PROTECTED]
        Subject:  RE: RADB - BGP routing

        Being assigned PI space does NOT guarantee global routability.  See
RFC 2050.

        In the real world, prefixes shorter than /21 will probably be 
        globally routable.  Indeed, /24 may very well be routable. Hint:  do

        NOT call a /24 a Class C.  Registries and providers get very 
        suspicious of addressing plans
        in which everything falls on a /24 or /16 boundary.

        But the address registries -- APNIC, RIPE NCC, and ARIN -- do not 
        control what prefix length filters are implemented by providers.  No

        organization guarantees global reachability, because no organization

        controls global routing.

        Incidentally, the registries may differ in other policies.  RIPE NCC

        now requires that you must register your routing policies before 
        being assigned an AS.

        It's not even as simple as length.  Some filter policies are on the 
        NANOG web page.  A given carrier, for example, may permit a /24 from

        the 192/8 "traditional" or "swamp" space, but not permit a /24 from 
        more recently assigned blocks for which people are expected to know 
        about CIDR.

        Unfortunately, a lot of this real-world global routing conventions 
        are not well documented.  My understanding of them began with 
        RIPE-181, which was superceded by RPSL.  That simply taught me the 
        language.  A good working knowledge comes from daily reading of 
        NANOG, RIPE, and APNIC mailing lists, and, even then, I need to 
        discuss policies with every specific provider involved in a 
        particular peering situation.

        There's good news, I suppose, that Cisco certifications and global 
        routing practice have little to do with one another.
        There's bad news, I suppose, that Cisco certifications and global 
        routing practice have little to do with one another.

        Guilherme Spolidoro wrote,

        >If APNIC gave you only a single class C, yes.
        >
        >The bottow line is: you need to follow the APNIC rules. If they
assigned a
        >class C to you is because their current rules for that class C
range is to
        >assign on a /24 manner. Most likely they have other blocks of class
C that
        >they assign on CIDR mode.
        >
        >Does it help?
        >
        >From: Benny Leong (HTHK - Senior Engineer II - iServices
Development,
        >NNSD) [mailto:[EMAIL PROTECTED]]
        >Sent: Thursday, September 28, 2000 2:19 AM
        >To: 'Brian'
        >
        >I have PI class C address applied from APNIC. Am I globally
routable ?
        >
        >       ----------
        >       From:  Brian [SMTP:[EMAIL PROTECTED]]
        >
        >       On Wed, 27 Sep 2000, Benny Leong (HTHK - Senior Engineer II
-
        >iServices Development, NNSD) wrote:    >
        >       > >From the ARIN, there is a statement shown below :
        >       >
        >       > *The minimum block of IP address space assigned by ARIN is
a /20.
        >Smaller
        >       > blocks obtained directly from ARIN are the least likely to
be
        >globally
        >       > routable.
        >       >
        >       > What does that mean ?  Thanks.
        >
        >       It means that if you got an allocation from arin of say a
/24, /23,
        >       etc.  That its the least likely space to be routable.  Back
in the
        >day,
        >       ARIN would allocate a /24 to just about anyone on the net
with a
        >       presense......this space is not part of any provider
aggregate, and
        >its
        >       the least likely to be routable.
        >
        >       >       ----------
        >       >       From:  Spolidoro, Guilherme
        >[SMTP:[EMAIL PROTECTED]]
        >       >       Sent:  Monday, September 25, 2000 9:15 PM
        >
        >       >       You can find a lot of information about RADB on the
RADB.net
        >web
        >       > site. The
        >       >       problem is that I never found some examples or
explanations
        >on how
        >       > large
        >       >       ISPs use the information stored on the IRRd servers
on real
        >life.
        >       > Maybe
        >       >       somebody with more experience could comment about
that.
        >       >
        >       >       Anyway, RADB runs an IRRd server that is used to
store each
        >ISP
        >       > routing
        >       >       policy, for example: what are your AS numbers, your
        >networks, what
        >       > networks
        >       >       you'll accept from ISP xxx or what networks you're
going to
        >       > advertise to ISP
        >       >       wwww (just two simple examples). You write your
policy using
        >a
        >       > specific
        >       >       language (like an script) that can be used to
configure the
        >BGP on
        >       > your
        >       >       NAP/MAE routers.
        >       >
        >       >       There are serveral IRRd servers and RADB.net host
the
        >"official" one
        >       > for the
        >       >       US. RIPE has another server for Europe and some ISPs
have
        >their own
        >       > server.
        >       >       I'm not sure why an ISP would want to have his own
IRRd
        >server, but
        >       > my guess
        >       >       is that they probably use that information to know
what are
        >their
        >       >       customers's BGP policies for them, i.e. what
networks their
        >       > customers will
        >       >       advertise for them so they can configure the BGP
filters
        >properly.
        >       >
        >       >       I know of at least one ISP that won't accept any
        >advertisement from
        >       > their
        >       >       customers unless register on the RADB IRRd server.
        >       >
        >       >       It's my opinion that since everybody can use the
information
        >on the
        >       > IRRd
        >       >       servers as they want, it's always good to keep it up
to date
        >so you
        >       > don't
        >       >       have somebody blocking your networks because you
didn't
        >register
        >       > your latest
        >       >       policy there.
        >       >
        >       >       Good luck.
        >       >
        >       >       -----Original Message-----
        >       >       From: Benny Leong (HTHK - Senior Engineer II -
iServices
        >       > Development,
        >       >       NNSD) [mailto:[EMAIL PROTECTED]]
        >       >       Sent: Monday, September 25, 2000 2:09 AM
        >       >       To: '[EMAIL PROTECTED]'
        >       >       Subject: RADB - BGP routing
        >       >
        >       >       What is the use of RADB ?
        >       >       Is it a must to register AS number and the route to
the RADB

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