2 minimum/maximum bandwidth qos mode – Comtech EF Data CDM-570 User Manual
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CDM-570/570L Satellite Modem with Optional IP Module
Revision 12
Ethernet IP Module Interface
MN/CDM570L.IOM
13–14
The following table can be used as a reference for some well known Port numbers:
Port
Description
Port Description
1
TCP Port Service Multiplexer (TCPMUX)
118
SQL Services
7 ECHO
119
Newsgroup
(NNTP)
20
FTP - Data
137
NetBIOS Name Service
21
FTP - Control
139
NetBIOS Datagram Service
22
SSH Remote Login Protocol
150
NetBIOS Session Service
23 Telnet
156
SQL
Server
25
Simple Mail Transfer Protocol (SMTP)
161
SNMP
42
Host Name Server (Nameserv)
179
Border Gateway Protocol (BGP)
53
Domain Name System (DNS)
190
Gateway Access Control Protocol (GACP)
69
Trivial File Transfer Protocol (TFTP)
197
Directory Location Service (DLS)
70
Gopher Services
396
Novell Netware over IP
80 HTTP
443
HTTPS
108
SNA Gateway Access Server
444
Simple Network Paging Protocol (SNPP)
109 POP2
546 DHCP
Client
110 POP3
547 DHCP
Server
115
Simple File Transfer Protocol (SFTP)
1080 Socks
Once the QoS Rules are defined, each type of traffic flow should be isolated and sent
to verify that it is being sent in the intended QoS Rule.
13.4.5.2 Minimum/Maximum Bandwidth QoS Mode
QoS Rules can be assigned to up to 32 different types of flows to be user-defined. Flows can be
defined by any combination of Protocol (FTP, UDP, RTP, etc.), Source/Destination IP (specific
or range), and/or Layer 3 Source/Destination Port.
Weighted Random Early Detection (WRED) – The Min/Max BW QoS mode allows selection
of Weighted Random Early Detection (WRED).
WRED allows for more graceful dropping of packets as QoS queues get full. Typically, without
WRED, packets are dropped based upon a simple tail drop algorithm that is applied to packets as
they are being added to the QoS queues. This can result in large numbers of contiguous packets
being dropped, which causes many protocols such as RTP and TCP to ungracefully degrade
performance in a over-consumed or bursty scenario. WRED applies a randomization, which
means that the percentage change to drop packets increases as the queue becomes full, and
minimizes the chances of global synchronization. Thus, WRED allows the transmission line to be
used fully at all times.
Maximum Bandwidth – This can be assigned to a flow to restrict the Maximum Bandwidth that
any particular flow will utilize; otherwise, the default of no bandwidth restriction can be selected.