DHCP server logging for IPv6

Jay Ford jay-ford at uiowa.edu
Wed Apr 20 22:08:36 UTC 2011

I find the logging by the DHCP server (4.2.1) for IPv6 to be not only 
completely different than for IPv4, but also almost completely useless for 
the purposes of tracking lease changes.

For example, the IPv4 logging for a new client looks something like:

    DHCPDISCOVER from 00:11:22:33:44:55 via
    DHCPOFFER on to 00:11:22:33:44:55 via
    DHCPREQUEST for ( from 00:11:22:33:44:55 via
    DHCPACK on to 00:11:22:33:44:55 via

By contrast, the IPv6 logging is just:

    Relay-forward message from 2001:db8:4:9::1 port 547, link address 2001:db8:4:2::1, peer address fe80::6972:f900:6038:8321
    Picking pool address 2001:db8:4:2:ddde:a4b5:c6d7:e8f9
    Sending Relay-reply to 2001:db8:4:9::1 port 547

& the "Picking pool..." entry is logged at "debug" level.

The v6 & v4 information is admittedly quite different, but it seems that the
logging could be at least similar & quite a bit more useful.

Is anybody working on improving the DHCPv6 logging?

Jay Ford, Network Engineering Group, Information Technology Services
University of Iowa, Iowa City, IA 52242
email: jay-ford at uiowa.edu, phone: 319-335-5555, fax: 319-335-2951

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