Re: Logon and Replication Traffic Analisys

Giganews Newsgroups
Subject: Re: Logon and Replication Traffic Analisys
Posted by:  Paul Bergson [MVP-DS] (
Date: Thu, 7 Aug 2008

If you have more than about 50 users in a site, have a slow link, an
application that needs to access AD or an unreliable link then that site
should have a DC.  Obviously I have over simplified but those are mainly the
basics to look at when you are trying to decide which sites should have a

Best Practice Guide

Paul Bergson
MVP - Directory Services
MCTS, MCT, MCSE, MCSA, Security+, BS CSci
2008, 2003, 2000 (Early Achiever), NT4

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"FB" <…> wrote in message
> I´m doing some tests in my environment with 2 Sites connected by a 2 Mb/s
> WAN Link and 250 users in Site1 and 350 Users in Site2
> I´m doing some analisys and, in my environemnt, a Logon consumes aprox.
> 100Kb (KBit) of traffic with a average rate o 5-6 KB/s (KByte) and the AD
> Replication Traffic uses a 15-Minutes interval, 24H/Day and each
> replication
> connection consumes 15-22 KB/s in 7:00 AM-18:00 period and 12-14 KB/s in
> non-work hours (Measurement made by Perfmon, Bytes/Sec After compression
> Inbound/Outbound)
> I´m beggining a "SIngle Sign On" Project to consolidate various Forest
> structures in 50 locations with 10, 30, 40 users and 6 of then with more
> than
> 100 users each in a Big AD Forest with 2.400 users and 2500 PCs
> I´m tryingo to understand wich option is better.  More DCs to service
> Logon
> Requests "onsite" (more replication traffic and less Logon Traffic ) or
> Less
> DCs centralizing Logon, avoinding Replication Traffic (More Logon Traffic
> and
> less Replication Traffic)
> Some locations have full time admins (probably i´ll use Child-Domains) and
> som locations have 128 Kb/s leased/MPLS WAN
> There somthing more to consider in the decision?



In response to

Logon and Replication Traffic Analisys posted by FB on Wed, 6 Aug 2008