Blue Coat Systems SG Appliance Manual De Usuario
Chapter 5: Statistics
83
About the Byte Totals
The client and server byte total is the sum of all bytes going to and from the client or
server. All application-level bytes are counted, including application overhead such as
HTTP headers, CIFS headers, and so on. TCP and IP headers, packet retransmissions, and
duplicate packets are not counted.
server. All application-level bytes are counted, including application overhead such as
HTTP headers, CIFS headers, and so on. TCP and IP headers, packet retransmissions, and
duplicate packets are not counted.
The following sections describe some of the factors that can affect the byte totals.
ADN Tunnels
If the traffic is flowing through an ADN tunnel, the bytes are counted after ADN
optimization, meaning that compressed byte counts are displayed.
optimization, meaning that compressed byte counts are displayed.
Multiple Server Connections
A single client connection can use many server connections. The server byte counts
include the total bytes transferred over all server connections accessed over the lifetime of
a client connection. Even though a server connection can serve many clients, the same
server byte is never included in more than one client connection total.
include the total bytes transferred over all server connections accessed over the lifetime of
a client connection. Even though a server connection can serve many clients, the same
server byte is never included in more than one client connection total.
Aborted Downloads
In some cases, you might see the server bytes increasing even after the client has closed
the connection. This can occur when a client requests a large object and aborts the
download before receiving the entire object. The server bytes continue to increase because
the SG appliance
the connection. This can occur when a client requests a large object and aborts the
download before receiving the entire object. The server bytes continue to increase because
the SG appliance
is retrieving the object for caching.
Explicit Proxying and Pipelining
If clients are explicitly proxied and the session has multiple connections or is pipelined, no
client bytes are displayed and the expanded server connections display no gain when the
tree view is shown. This is because the SG appliance is downloading the content before
serving it to the client.
client bytes are displayed and the expanded server connections display no gain when the
tree view is shown. This is because the SG appliance is downloading the content before
serving it to the client.
What Is Not Displayed
The
Proxied Sessions page
does not display statistics for:
❐
IM (Yahoo, AOL, MSN), DNS, SOCKS, and Telnet
❐
Inbound ADN connections
❐
Bridged connections
❐
Administrative connections (Management Console, SSH console, SNMP, DSAT,
access-logging, Director, and so on)
access-logging, Director, and so on)
❐
Off-box processing connections (ICAP, DRTR, etc.)
Filtering the Display
Use the
Filter
drop-down list to filter the proxied session statistics.
Note:
In some cases, an administrative or off-box connection might correspond to a
specific client connection, for example, an ICAP AV scanning connection associated with a
specific HTTP client connection. However, the byte counts collected from administrative
or off-box connections are not included in the Active Sessions display.
specific HTTP client connection. However, the byte counts collected from administrative
or off-box connections are not included in the Active Sessions display.