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IPv4 smaller than /24 leasing?

Yes, we do this for several clients.  We route them a smaller than 24 block over a tunnel.

Which bring up an interesting question.  Will there be a time where the smallest block size recognized will be something smaller than a /24? /25, /26 ? Most modern routers have the horsepower to deal with larger route tables. 

I know of dozens, if not hundreds of small ISPs that canâ??t participate in BGP because they donâ??t have big enough blocks.  Many others who do are not utilizing their /24 so it just kinda sits there. They have to have their provider assigned IP space be advertised. Does not help them getting on to an IX though.

I know I know IPV6 is the answer not going to accepting smaller blocks. 

Justin Wilson
j2sw at mtin.net


> On Jan 4, 2018, at 5:31 PM, Michael Hallgren <mh at xalto.net> wrote:
> Thanks Bill. Kinda ugly, but OK I see... Prefer v6 ;-)
> mh
> Le 4 janv. 2018 à 23:17, à 23:17, William Herrin <bill at herrin.us> a écrit:
>> On Thu, Jan 4, 2018 at 5:07 PM, Michael Hallgren <mh at xalto.net> wrote:
>>> Am I missing something? What's the trigger for doing tunneling here?
>> With "IP address leasing" you aren't connected to the network which
>> holds
>> the address registration.
>> For leasing less than a /24, they need a plan other than "advertise to
>> your
>> peers with BGP" because even if your peer accepts a /27, most of their
>> peers will not.
>> Regards,
>> Bill Herrin
>> --
>> William Herrin ................ herrin at dirtside.com  bill at herrin.us
>> Dirtside Systems ......... Web: <http://www.dirtside.com/>