Re: [cobalt-users] name based bandwidth monitor

[Sevo Stille <sevo@xxxxxxxx>]

Rob Rivas wrote:
> 
> Hi
> 
> I am using the One IP based hosting (multi domains on one ip)
> 
> Can you guys recommend a good program to show me the bandwidth usage
>
> I seen a couple on this list, but those programs give you the usage for
> mulit-ip's instead


That is all you can get. There ain't no such thing as a name based
network monitor. By the very nature of TCP/IP, there is no such thing as
name based IP hosting - DNS is just a directory service for the
convenience of applications and users, the network itself does only use
dotted-quad addresses. Name based hosting is strictly at application
level, and is only supported by a few protocols (notably HTTP). 

So you are down to application level (i.e. for practical reasons, mostly
logfile) monitoring if you want to see the bandwidth usage by name.
Which inevitably will ignore all traffic on other ports (ping etc.) as
well as network overhead (handshakes, resent packets etc.). Network
monitors can fudge something name-based by peeking inside the packet
payload, but at that point, it gets rather expensive CPU-wise, and you
still end up with some amount of  non-name-based traffic (by my
experience sth. between 5% and 30%) that cannot be assigned to a
particular name and client.
 
Sevo

-- 
Sevo Stille
sevo@xxxxxxxx