[c-nsp] PBA best practices

[Tassos Chatzithomaoglou]

We did various measurements in our network and we ended up with the following for DSL customers using DS-Lite:

block size 512
max blocks per user 16
block timeout 120
address-sharing-ratio 8:1

avg usage is 34 ports per block and 1,3 blocks per address, but the top 1% are at least x10.

Some years ago we had started with more relaxed numbers (to be on the safe side), but last year we squeezed them a little. No complaints until now.

--
Tassos

Pshem Kowalczyk wrote on 26/2/16 02:27:
> Hi,
>
> We (for a fixed line fibre/DSL customers) run the following settings:
> - block size - 1024 ports
> - up to 4 blocks per sub
> - address sharing ratio - used to be 30:1, now moving to about 15:1
> - tcp initial timeout - 60 sec, UDP - 60 sec.
>
> kind regards
> Pshem
>
>
> On Fri, 26 Feb 2016 at 12:56 Adam Vitkovsky <Adam.Vitkovsky at gamma.co.uk>
> wrote:
>
>> Hi folks,
>>
>> Would like to ask regarding PBA best practices.
>>
>> From the documentation it was obvious that from a performance point of
>> view using smaller number of larger pools is better than using large number
>> of smaller pools.
>> But how do I strike the balance? In other words what is the average number
>> of sessions for an average internet user?
>>
>> I'm interested in these values in particular:
>> block-size ?saw 512 or 1024?
>> max-blocks-per-user ?have no idea 2 or 4?
>> active-block-timeout ?
>> overall mapping-timeout ?
>> address sharing ratio ?16:1 before spamhaus blacklists the public IP?
>>
>> If anyone could share their experience or point me to some nanog
>> presentation or a best practice doc that would be great.
>>
>>
>> adam
>>
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>>
>>         Adam Vitkovsky
>>         IP Engineer
>>
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