Are you talking about cgnat ? if so, Why do you only see blocks 512 and 1024 ?
I see 8 - 4096....
Where do you see these settings ? I see bulk-port-alloc but I don't see
anything about max-blocks-per-user, active-block-timeout, overall
mapping-timeout, address sharing ratio ??
Mon Feb 29 14:25:16.812 CST
Building configuration...
!! IOS XR Configuration 5.3.1
service cgn cgn1
service-location preferred-active 0/3/CPU0
service-type nat44 nat1
portlimit 5000
alg ActiveFTP
inside-vrf six
!
!
!
end
RP/0/RSP0/CPU0:eng-lab-9k-1(config-cgn-invrf)#bulk-port-alloc ?
size Bulk size for allocation.
Should be greater or equal to one fourth of the port limit
and less than twice the port limit.
For optimum results, should be close to half the port limit
RP/0/RSP0/CPU0:eng-lab-9k-1(config-cgn-invrf)#bulk-port-alloc size ?
none No bulk allocation
8 Allocate 8 ports in bulk
16 Allocate 16 ports in bulk
32 Allocate 32 ports in bulk
64 Allocate 64 ports in bulk
128 Allocate 128 ports in bulk
256 Allocate 256 ports in bulk
512 Allocate 512 ports in bulk
1024 Allocate 1024 ports in bulk
2048 Allocate 2048 ports in bulk
4096 Allocate 4096 ports in bulk
-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-boun...@puck.nether.net] On Behalf Of Adam
Vitkovsky
Sent: Thursday, February 25, 2016 5:56 PM
To: cisco-nsp@puck.nether.net
Subject: [c-nsp] PBA best practices
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.vitkov...@gamma.co.uk
W: www.gamma.co.uk
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