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NETGEAR DGFV338 - ProSafe Wireless ADSL Modem VPN Firewall Router Configuration Manual

Configuring type-of-service (tos) features
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Download this manual See also: Reference Manual, Installation Manual
Configuring Type-of-Service (ToS) features on the DGFV338
Scope:
This document details what the packet priority (ToS) feature of the DGFV338 does.
These results were tested on a DGFV338 running firmware 2.1.1-22.
Contents:
1. What is ToS?
2. Setting up ToS on the DGFV338.
3. What changes do the ToS settings make to the packet headers?

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Summary of Contents for NETGEAR DGFV338 - ProSafe Wireless ADSL Modem VPN Firewall Router

  • Page 1 Configuring Type-of-Service (ToS) features on the DGFV338 Scope: This document details what the packet priority (ToS) feature of the DGFV338 does. These results were tested on a DGFV338 running firmware 2.1.1-22. Contents: 1. What is ToS? 2. Setting up ToS on the DGFV338. 3.
  • Page 2 What is Type-of-Service (ToS)? ToS is an IP QoS (quality-of-service) mechanism, which uses certain bits in the IP header to indicate to network devices how packets should be treated. It is up to each network device that a packet passes through to know how to respond to the ToS bits, and if a device is not ToS-capable then the bits are simply ignored and all packets are treated in the same way.
  • Page 3 Setting up ToS on the DGFV338 There are 2 places in the DGFV338 where ToS can be set: 1. When adding a Custom Service: When adding an Outbound Firewall Rule:...
  • Page 4 In both cases, the same 5 ToS options are available, with “Normal-Service” as the default: 1. Normal –Service 2. Minimize-Cost 3. Maximize-Reliability 4. Maximize-Throughput 5. Minimize-Delay So which setting takes precedence? Q. If you create a custom service, and use that custom service when creating an outbound rule, which of the 2 ToS settings will take precedence and determine how the packet is prioritised? A.
  • Page 5 What changes do the ToS settings make to the packet headers? In the IPv4 packet header, the second byte (bits 9-16) is designated “Type Of Service” (ToS). The use of this byte has changed as different QoS standards have been established. I shall refer to these different standards as “Original ToS”, “RFC1349 ToS”, and “DSCP”: Original ToS: Precedence Precedence Precedence Minimize...