Any advantage of announcing IPv6/64s Or purely misconfiguration?

Mon Jul 9 07:45:39 UTC 2012

On 7/9/12 00:09 , Aftab Siddiqui wrote:
>>
>>
>>
>> As per IPv6 prefixes announced by AS9583 via bgp.he.net -
>> http://bgp.he.net/AS9583#_prefixes6 we can see multiple /64s.

you likely won't see them in your table though.

>>
> The question is why their upstreams are accepting /64? It shouldn't be at
> all otherwise just imagine how many /64s you have to deal with once IPv6
> is in full swing.

that vantage point of the collector is germain here since if there are
more specifics either filtered or no export those routes might appear
from the vantage point of an upstream (where the collector is used) but
not elsewhere:

so consider the cidr report

9583 SIFY-AS-IN Sify Limited

  Adjacency:     7  Upstream:     5  Downstream:     2
  Upstream Adjacent AS list
    AS6939    HURRICANE - Hurricane Electric, Inc.
    AS10026   PACNET Pacnet Global Ltd
    AS6453    GLOBEINTERNET TATA Communications
    AS1273    CW Cable and Wireless Worldwide plc
    AS3257    TINET-BACKBONE Tinet SpA
  Downstream Adjacent AS list
    AS45184   DEN-ISP-AS-IN-AP Den Digital Entertainment Pvt. Ltd. AS
ISP india
    AS17825   MAHINDRABT-AS-AP Tech Mahindra Ltd. Software Development
Organisation India

Announced IPv6 Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space
 (pfx)  Description
1337  AS9583   ORG+TRN Originate: 4294967296 /32.00  Transit:     131073
/47.00 SIFY-AS-IN Sify Limited
Aggregation Suggestions

This report does not take into account conditions local to each origin
AS in terms of policy or traffic engineering requirements, so this is an
approximate guideline as to aggregation possibilities.

 Rank AS            AS Name                                      Current
 Wthdw  Aggte  Annce Redctn       %
 1448 AS9583  SIFY-AS-IN Sify Limited                       1      0
  0      1      0   0.00%

  Prefix               AS Path                              Aggregation
Suggestion
  2001:e48::/32        5539 1273 9583

and ask yourself are they really leaking /64s into the DFZ which are
being accepted (they aren't) or do they have and adjacency with he.net

[jjaeggli at net-oob1.ca2 ~]$ telnet route-views6.routeviews.org
Trying 128.223.51.112...
Connected to route-views6.routeviews.org (128.223.51.112).
Escape character is '^]'.

route-views6.routeviews.org> show ipv6 bgp 2001:0e48:0000:0001::/64
% Network not in table
route-views6.routeviews.org>

route-views6.routeviews.org>  show ipv6 bgp 2001:0e48::/32 longer-prefixes
BGP table version is 0, local router ID is 128.223.51.112
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal,
              r RIB-failure, S Stale, R Removed
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
*  2001:e48::/32    2001:4810::1                           0 33437 29748
6939 7473 9583 i
*                   2600:803::15                           0 701 3549 9583 i
*                   2001:4830::5           361             0 30071 3549
9583 i
*                   2001:4830::e             0             0 30071 6453
9583 i
*                   2001:428::205:171:203:140
                                       8000029             0 209 10026
9583 i
*                   2001:428::205:171:203:141
                                       8000919             0 209 174 9583 i
*                   2001:428::205:171:203:138
                                       8000051             0 209 3257 9583 i
*                   2607:4200:10::3                        0 19214 12989
6939 10026 9583 i
*                   2607:4200:10::2                        0 19214 12989
6939 10026 9583 i
*                   2001:200:901::5                        0 7660 4635
10026 9583 i
*                   2001:418:0:1000::f002
                                             1             0 2914 3257
9583 i
*                   2001:418:0:1000::f000
                                             0             0 2914 174 9583 i
*                   2001:1890:111d::1
                                                           0 7018 174 9583 i
*                   2001:1620:1::203
                                             1             0 13030 3257
9583 i
*                   2001:470:0:1a::1
                                                           0 6939 10026
9583 i
*>                  2001:668:0:4::2         10             0 3257 9583 i
*                   2001:240:100:ff::2497:2
                                                           0 2497 10026
9583 i
*                   2610:38:1::1                           0 7781 6939
7473 9583 i

Total number of prefixes 1

> Regards,
> 
> Aftab A. Siddiqui
> 