
Troubleshooting Network Boot Problems
114074 Rev. A A-9
Use Packet Capture as follows:
1. Test the BOOTP server’s next-hop router in the path to the AN/ANH.
2. Test the upstream router’s interface to the AN/ANH.
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.
• If the BOOTP server is not receiving the requests, make sure the upstream
router is receiving and forwarding them. If it is receiving, make sure each
router interface between the upstream router and the BOOTP server is
receiving and forwarding them.
If the BOOTP server is receiving requests, but failing to respond, refer to
“Router Fails to Netboot” earlier in this appendix.
Note: The instructions that follow assume that Version 7.80 or higher is
running on all routers in the path between the AN/ANH and the BOOTP
server.
Note: The LAN protocol analyzer does not decode all of the vendor tag fields.
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