Comtech EF Data FX Series Administrator Guide - Manual (Page 135)

Comtech EF Data / Stampede
FX Series Administration Guide - Version 6.1.1 135
Chapter: FX Series Optimization Settings
Section: Layer 5 Application Policies
MN-FXSERIESADM6 Rev 5
The DSCP value: Specifies the ToS bits based on the binary value in the “DSCP value” field. DSCP is an
abbreviation for “Differentiated Services Code Points” and is described in more detail in the
RFC-2724
specification.
8.4.6 Layer 5 Acceleration - Theory of Operation
“Layer 5” acceleration provides optimization of communication protocols when a FX
Remote is installed at a branch in “in-line” mode. The FX Remote can then intercept and
optimize the traffic with additional capabilities such as dynamic data suppression and
traffic classification/prioritization. Most TCP based protocols can be accelerated with
this solution, however there are some exceptions:

FTP can only be accelerated when it is operating in “passive” mode. By default the ftp
function of the Internet Explorer operates in “active” mode and you must adjust an
advanced browser setting in order for Layer 5 to operate. Also the standard Windows
command line “ftp.exe” program only operates in “active” mode and therefore can’t be
accelerated by Layer 5.

Due to the nature of some TCP/IP based protocols; The Layer 5 acceleration techniques can
function however they do not provide significant benefit. For example:
o
The latest version of MS-Outlook/Exchange protocol is already highly compressed and
also there is an application level acknowledgement that takes place after every 17K
bytes which defeats the value of TurboStreaming. (MS-Outlook using the POP3/SMTP
protocols can derive great benefit from Layer 5 acceleration.)
o
Protocols that are encrypted (or already compressed) will not benefit from the product’s
Layer 5 compression but may benefit from the TurboStreaming.
The following table depicts a list of TCP and UDP ports used by well-known applications.
Application TCP
/
UDP Por
ts
CIFS TCP 139,445
Citrix ICA TCP/UDP 2598,1494
CVS TCP 2401
DNS UDP 53
FTP TCP 20,21
Lotus Notes/Domino TCP 1352
Lotus Sametime TCP 1533
MS Remote Desktop Connection TCP 3389
NFS UDP 2049
Novel GroupWise TCP 1677
NTP (Network Time Protocol) UDP 123
POP3 TCP 110
SIP (Session Initiation Protocol) TCP/UDP 5060,5061
SMTP TCP 25
Telnet TCP 23
TFTP UDP 69
TurboGold Enterprise Edition TCP 4916
VNC TCP 5900
Windows Live Messenger (Voice) TCP/UCP 6901
Figure 8-7 FX Series TCP/UDP Ports Table