Unless it's specifically configured otherwise, yes.  It's a basic part of the tcp/ip protocol.  You might start reading here http://en.wikipedia.org/wiki/Transmission_Control_Protocol, continuing on to the links at the end of the "Data Transfer" section.
 
-----Burton


From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Matthew Moore
Sent: Monday, September 19, 2005 8:11 AM
To: [email protected]
Subject: RE: [Ntop] NTOP Netflow and Peak Data Throughput

Hi,

 

Ok it basically ‘bottle necks’ at the 2MB?

 

Thanks

 

Matt

 


From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Burton Strauss
Sent: 19 September 2005 14:07
To: [email protected]
Subject: RE: [Ntop] NTOP Netflow and Peak Data Throughput

 

OK, so what is surprising about a peak of 6something on a 100 Mbps link???

 

Unless the upstream router is specifically configured to throttle the flow, any flow control to the 2 Mbps CIR is going to happen at the 2 Mbps interface, based on congestion, not at the upstream router.  Even if the upstream router IS configured for flow control, you need to figure out what the CIR and BIR rates are.

 

-----Burton

 

 


From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Matthew Moore
Sent: Monday, September 19, 2005 7:51 AM
To: [email protected]
Subject: RE: [Ntop] NTOP Netflow and Peak Data Throughput

Hi,

 

Basically it looks like this –

 

 

------- (100MB) Upstream Router ---------- (45MB) ----------- Router ------- (2MB) -------- Customer Router

 

 

The Upstream router is running Netflow and sending the information to NTOP which is on part of our core network.

 

Cheers

 

Matt

 


From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Burton Strauss
Sent: 19 September 2005 13:45
To: [email protected]
Subject: RE: [Ntop] NTOP Netflow and Peak Data Throughput

 

Well, limits are often quoted as CIR (Committed Information Rate), but allow bursting to higher rates.  But without understanding the network layout and where the sensors are, I can't begin to guess.

 

-----Burton

 


From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Matthew Moore
Sent: Monday, September 19, 2005 5:08 AM
To: [email protected]
Subject: [Ntop] NTOP Netflow and Peak Data Throughput

Hi,

 

I have installed NTOP 3.1 and I am using the Netflow Plugin with it. It is collecting data fine but for example a customer of ours is on a 2MBs fixed speed leased line and the NTOP stats are saying that the peak data throughput is 6.7MBs. How can this be possible?

 

Many thanks

 

Matthew

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