
Troubleshooting Network Boot Problems
114084 Rev. A A-9
Guidelines for Using Packet Capture
Use the Packet Capture utility to view incoming or outgoing BOOTP or TFTP
packets and isolate errors to a specific router interface. This utility is available
through the Technician Interface on routers running Version 7.80 or later.
Refer to Using Technician Interface Software for instructions on how to use
Packet Capture. Refer to Configuring SNMP, BOOTP, DHCP, and RARP
Services for a description of BOOTP packets.
Use Packet Capture as follows:
1. Test the BOOTP server’s next-hop router in the path to the
AN/ANH/ARN.
2. Test the upstream router’s interface to the AN/ANH/ARN.
3. Test the upstream router’s interface to the next-hop router.
4. Test the interfaces that receive and forward the BOOTP and TFTP
packets of the router in the middle of the path.
5. Continue testing each router in the path until you isolate the problem
interface.
Guidelines for Using a LAN Protocol Analyzer
Refer to the following guidelines when you use a LAN protocol analyzer:
• If Netboot is failing, connect the analyzer to the BOOTP server interface to
determine whether it is receiving and responding to Netboot and TFTP
requests.
To read the ASCII translation, view the BOOTP reply packets for the
configuration file pathname in hexadecimal mode.
Note: The instructions that follow assume that Version 7.80 or later is running
on all routers in the path between the AN/ANH/ARN and the BOOTP server.
Note: The LAN protocol analyzer does not decode all of the vendor tag fields.
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