Cornell Log Basics
Macintosh Version
Cornell Log works with these Macintosh OS X releases:
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version 10.2
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version 10.3 (recommended)
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version 10.4 (recommended)
version 10.5 (recommended)
Cornell Log shows you both your total network traffic and your off-campus network traffic.
Any network traffic coming from your computer which leaves the Cornell
Wide Area Network (WAN) and any network traffic traveling from outside
Cornell to your computer counts towards your off-campus network usage.
This includes off-campus web pages you view, audio and video streamed
to and from your computer, files you download, files you upload to and
from off-campus sites, and files downloaded from your computer by off-campus
users (for example, through file-sharing programs).
Note: For Cornell Log to track your usage accurately, it needs to run
whenever you have access to the Cornell network. See the
Automatic Start page for instructions on setting the Macintosh version of Cornell Log to start automatically when you turn on your computer.
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| Note: As of June 1, 2008, it's likely that the usage totals tracked by Cornell Log will not match the NUBB interface. Please
be aware that NUBB is the official record for billing purposes. |
The most
important parts of the Cornell Log interface are the number and "thermometer"
at the right side. The number is your
total off-campus network traffic for the month; the thermometer at the top shows
this same number graphically, with the 10-gigabyte billing threshold (where you begin
to incur additional fees) marked. (Note: For faculty and staff, the billing threshold is 5-gigabytes. For more information, see the Network Rates Overview page.
Options Menu
Exclude Multicast
Multicast is an Internet technology for transmitting data simultaneously
to many receivers without the need to replicate the data. A multicast
message is sent out to multiple devices on the network by a host.
Multicasts are generally sent at specified intervals to avoid cluttering
the network. To include multicast traffic in the bandwidth total,
de-select Exclude Multicast from the Options menu. Multicast
traffic is not included in the off-campus total.
Exclude DNS
DNS (Domain Name Server) is used to map names to IP addresses and
vice versa. For example, the domain namemyhome.sbcglobal.net
might translate into an IP address of 207.115.55.201. To include DNS
traffic in the bandwidth total de-select Exclude DNS from the
Options menu. DNS traffic is not included in the off-campus
total.
Display Last Packet
Internet activity consists of the exchange of information with another
computer. The other computer can be referred to as an IP Address,
a host name, or a web site. You can get more detailed information
about your Internet activity by viewing the last packet information.
Select Display Last Packet from the Options menu to
see the last packet size, the last protocol used (TCP or UPD) , the
last off-campus IP address, and the total number of hosts for this
session.
What does "Dropped" mean?
(Complicated explanation ahead; you only need to read this if you
find that Cornell Log and the NUBB interface don't agree.)
Show Warning On Quit
Cornell Log can remind you that it can't collect statistics if you
quit out of it. To see this reminder, select Show Warning On Quit
from the Options menu.
Use Fast Screen Updates
By default, the Cornell Log window updates every 10 seconds. This
is to reduce processor demands. If you have a fast processor and want
the information to update more quickly, select Use Fast Screen
Updates from the Options menu to make Cornell Log refresh
more frequently. This option is off by default.
Questions about this topic: netrates@cornell.edu
Last modified:
July 10, 2008
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