Sprint Filters - what are they?

Mailman List Mirror (Read Only)
1

A while ago we had a customer with some routing problems which were caused
by Sprint filters (127/8 - 191/8, deny anything longer than /16). When
customer called Sprint, he's been told by someone from tech support that
'Sprint doesn't filter anything'. When I called support, I've been told
that on 127/8 - 191/8 range Sprint denies anything longer than /16. This
morning the same customer called Sprint again, to confirm this information,
and been told that for the above range Sprint denies anything longer than /19.
It seems like each time you call Sprint support, you hear a different story.

Will someone from Sprint _who knows_ confirm their filtering policy which
I have as follows:

0/8 - 126/8, deny subnets of historical A's
127/8 - 191/8, deny anything longer than /16
192/8 - 205/8, deny anything longer than /24
206/8 - 223/8, dney anything longer than /19
192/8 [RIPE], deny anything longer than /19

It would be really nice to have it posted at NANOG web page as well
(alas, only AGIS done so).

Thanks,

- Greg -

2

Sprint currently filters announcements from its
non-customers as follows:
        
        RFC 1597 reserved space: accept nothing (**)
        In the classical "A" space: accept nothing longer than /8
        In the classical "B" space: accept nothing longer than /16
                in 24/8 space: accept nothing longer than /19 (*)
                in 195/8: accept nothing longer than /19
                in 206/8 - 223/8: accept nothing longer than /19
                in 192/8 - 205/8: accept nothing longer than /24

(*) in-line with the IP registries allocation
(**) RFC 1597> Private Address Space

RFC 1597> The Internet Assigned Numbers Authority (IANA) has reserved
RFC 1597> the following three blocks of the IP address space for private
RFC 1597> networks:
RFC 1597> 10.0.0.0 - 10.255.255.255
RFC 1597> 172.16.0.0 - 172.31.255.255
RFC 1597> 192.168.0.0 - 192.168.255.255

Vab..