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List:       cisco-nsp
Subject:    Re: [c-nsp] PBA best practices
From:       Tassos Chatzithomaoglou <achatz () forthnet ! gr>
Date:       2016-02-29 22:40:14
Message-ID: 56D4C8CE.7070803 () forthnet ! gr
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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@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
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > Adam Vitkovsky
> > IP Engineer
> > 
> > T:      0333 006 5936
> > E:      Adam.Vitkovsky@gamma.co.uk
> > W:      www.gamma.co.uk
> > 
> > This is an email from Gamma Telecom Ltd, trading as "Gamma". The contents
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> > 
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