Network Router User Manual
Table Of Contents
- IOLINK-520 and IOLINK-PRO USER AND SYSTEM ADMINISTRATION GUIDE
- Installation
- Typical Applications & How to Configure Them
- 2.1 - Bridging and Routing
- Should You Bridge or Route?
- 2.2 Basic WAN Configurations
- 2.3 - Configure Remote Site Profiles
- 2.4 Advanced Features
- Introductionto Filtering
- Appendix AMenu Trees
- Appendix BOctet Locations on Ethernet Frames
- Appendix CServicing Information
- Opening the case
- Identifying the Internal Components
- To Clear a “Lost” Password
- Changing LAN or WAN Interfaces
- Selecting MDI or MDI-X LAN Interface
- Installing the ISDN Link Modules
- Processor settings for the ISDN Link Modules
- Changing the Termination Straps on the ISDN S/T Interface
- Connecting to the ISDN-U Link Module
- Performing a Software Upgrade
- Appendix DInterface Pinouts
- Pinout Information
- Link Clocking Information
- ATL-CSU/DSU Link Module Information
- Console Pinouts
- V.24 & RS232C Link Pinouts
- V.11/X.21 Link Pinouts
- RS442 & RS530 Link Pinouts
- V.35 Link Pinouts
- RS232 Null-Modem Cable Configuration
- V.35 Null-Modem Cable Configuration
- RS530 Null-Modem Cable Configuration
- RS530 To RS449 Conversion Cable
- V.11/X.21 Null-Modem Cable Configuration
- Index
- Warranty
IOLINK-520 & IOLINK-PRO Installation & Applications Guide —
B.1
Appendix B
Octet Locations on
Ethernet Frames
This appendix provides octet locations for the various portions of three of the common
Ethernet frames. When creating pattern filters these diagrams will assist in the correct
definition of the patterns. The offset numbers are indicated by the numbers above the
frame representations.
Note the differences in the TCP/IP and Novell frames when bridging and when routing.
When routing, the TCP/IP and Novell frames are examined after the Level 2 Ethernet
portion of the frame has been stripped from the whole data frame. This means that the
offset numbers now start from 0 at the beginning of the routed frame and not the bridged
frame.
Some of the common Ethernet type codes are also shown here. The Ethernet type codes
are located at offset 12 of the bridged Ethernet frame.
Octet Locations on a Bridged TCP/IP Frame