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

Anurag Bhatia me at
Mon Jul 9 06:17:54 UTC 2012

Hello everyone

I was just looking around and say a major Indian provider Sify (AS9583) is
announcing /64s via BGP along with main /32 which is their allocation from

inet6num:       2001:0E48::/32
netname:        SILNET
descr:          Sify Limited
descr:          Value Added Network service provider
country:        IN
admin-c:        HS51-AP
tech-c:         HS51-AP
status:         ALLOCATED PORTABLE
mnt-by:         APNIC-HM
mnt-lower:      MAINT-IN-SIFY
changed:        hm-changed at 20040211
changed:        hm-changed at 20060117
source:         APNIC

As per IPv6 prefixes announced by AS9583 via - we can see multiple /64s.

Prefix    <>Description   <>
2001:0e48::/32 <>Sify Limited
[image: India]
2001:0e48:0000:0001::/64 <>Sify
[image: India]
2001:0e48:0000:0002::/64 <>Sify
[image: India]
2001:0e48:0000:0004::/64 <>Sify
[image: India]

I see Tata Comm (Sify's upstream) is accepting /64s while Tinet (one of
other upstream) is dropping and taking only /32. Other major backbones like
HE, Level3 dropping but Telia still accepting. Pretty much mixed result.

Is it simply a misconfiguration or there is some use of announcing /64s
along with main /32?



Anurag Bhatia

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