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Ashark
Asked: 2019-09-19 20:44:00 +0800 CST

How to verbose log dhcp messages with options values

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I am trying to configure dhcp PXE server, but client is not booting as expected. Is there a way how you can watch transferred requested and responded options between client and server? I want to be able to see each individual option value.

logging

3 Answers

  1. Use dhcpdump -i eth0. This show nicely the content for the dhcp packets.

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  2. I did not found a way how to do it via system logs when using ISC DHCP. But I have found a super convenient and easy way to solve the task of debugging.

    Just use Wireshark. Start it as Superuser, then start capturing packets of a needed network interface. Initiate DHCP request from a client. Then in Protocol column you will see packets marked as DHCP. Click at one you are interested in. Then you are able to see contents of that package.

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  3. If using isc dhcpd, you can use log function for debugging: https://docs.menandmice.com/display/MM/using+the+log+function+for+debugging

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