fuzzy subnet aggregation

Sun Oct 27 19:35:42 UTC 2019

Not quite.

203.0.113.1
203.0.113.3
203.0.113.5
203.0.112.6
203.0.112.7

Will aggregate to 203.0.113.0/29 if you dont mind the missing 3 addresses
in the unaggregated list.

Hence, fuzzy aggregation.

Joe

> Is this what you are trying to accomplish?
>
> $ python
> Python 2.7.15rc1 (default, Nov 12 2018, 14:31:15)
> [GCC 7.3.0] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import netaddr
>>>> SomeList=netaddr.IPSet()
>>>> SomeList.add('203.0.113.0/25')
>>>> SomeList.add('203.0.113.128/25')
>>>> for x in list(SomeList.iter_cidrs()):
> ...   print x
> ...
> 203.0.113.0/24
>>>>
>>>> DifferentList=netaddr.IPSet()
>>>> DifferentList.add('0.0.0.0/0')
>>>> DifferentList.remove('203.0.113.1')
>>>> for x in list(DifferentList.iter_cidrs()):
> ...   print x
> ...
> 0.0.0.0/1
> 128.0.0.0/2
> 192.0.0.0/5
> 200.0.0.0/7
> 202.0.0.0/8
> 203.0.0.0/18
> 203.0.64.0/19
> 203.0.96.0/20
> 203.0.112.0/24
> 203.0.113.0/32
> 203.0.113.2/31
> 203.0.113.4/30
> 203.0.113.8/29
> 203.0.113.16/28
> 203.0.113.32/27
> 203.0.113.64/26
> 203.0.113.128/25
> 203.0.114.0/23
> 203.0.116.0/22
> 203.0.120.0/21
> 203.0.128.0/17
> 203.1.0.0/16
> 203.2.0.0/15
> 203.4.0.0/14
> 203.8.0.0/13
> 203.16.0.0/12
> 203.32.0.0/11
> 203.64.0.0/10
> 203.128.0.0/9
> 204.0.0.0/6
> 208.0.0.0/4
> 224.0.0.0/3
>>>>
>
> On Sun, Oct 27, 2019 at 1:10 PM Joe Maimon <jmaimon at jmaimon.com> wrote:
>
>> Does anyone have or seen any such tool? I have a script that seems to
>> work, but its terribly slow.
>>
>> Currently I can produce aggregated subnets that can be mising up to a
>> specified number of individual addresses. Which can be fed back in for
>> multiple passes.
>>
>> Doing RTBH on individual /32 does not scale well, if you are eyeing
>> collaboration with external lists. I have found likely sources that
>> could
>> produce another 100k prefixes easily.
>>
>> Joe
>>
>