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Comtech EF Data / Stampede
7.3.6 Layer 5 Acceleration - Discussion
"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.
CIFS
Citrix ICA
CVS
FTP
Lotus Notes/Domino
Lotus Sametime
MS Remote Desktop Connection
NFS
Novel GroupWise
POP3
SIP (Session Initiation Protocol)
SMTP
Telnet
VNC
FX Series Administration Guide - Version 6.2.2
Chapter: FX Series Optimization Settings
Section: Layer 5 Application Policies
Application
TCP / UDP
Figure 7-6 FX Series TCP/UDP Ports Table
Ports
TCP
139,445
TCP/UDP
2598,1494
TCP
2401
TCP
20,21
TCP
1352
TCP
1533
TCP
3389
UDP
2049
TCP
1677
TCP
110
TCP/UDP
5060,5061
TCP
25
TCP
23
TCP
5900
146
MN-FXSERIESADM6 Rev 6
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