How to calculate storage for Log Collector for CGNAt log session?
May i know whether someone can share the formula how to calculate space of storage need on Syslog/Log Collector for CGNAT session. Let's say the total suscriber is 3 million. Not sure whether url below is can use or juniper have their own formula calculation.
Re: How to calculate storage for Log Collector for CGNAt log session?
AFAIK, JNPR-proprietary calculation formula does not exist and You can use algorithm described in the cited Internet Draft.
You can get the exact raw syslog messages sizes and session establishment/teardown rates (if You are using NAT44) or PBA block allocation/release rates (if You are using PBA) from Your own lab or production.
And AFAIK, JNPR does not sell syslog compression products but others do (F5 comes to mind).
So that 0.25 is can used if number of suscriber change? Lets say 2m suscriber.
My another educated guess is that "a" is constant for a given log compressing device and does not depend on the subscriber count since log reformatters/compressors deflate every single syslog message individually (basically, cut & discard unnecessary fields and translate IP+timestamp ASCII records into binary) and do not "learn" patterns across other messages, as other popular algos like LZH do.