DHCP server stops responding when interface goes down and up

Perry · Apr 30, 2008, 3:04 PM

I would put a switch between them

mastermindpro · Apr 30, 2008, 3:12 PM

I know that would work, but it doesn't seem like this should be a problem in the first place.

hoba · Apr 30, 2008, 4:26 PM

I have the same setup at home for my neighbour. He is connected to an opt-interface with a crossovercable directly (seperate subnet firewalled against my lan with seperate dhcp server). I don't see this issue. Is the port bridged to anything or is another port bridged to this port? What do you see in the systemlogs regarding this problem?

mastermindpro · Apr 30, 2008, 4:30 PM

This is a log excerpt of all the time since the interface last went down and back up:

Apr 30 08:34:28 kernel: vr0: link state changed to DOWN
Apr 30 08:35:36 kernel: vr0: link state changed to UP
Apr 30 08:35:38 check_reload_status: rc.linkup starting
Apr 30 08:35:40 php: : Processing vr0 - start
Apr 30 08:35:40 php: : Hotplug event detected for vr0 but ignoring since interface is not set for DHCP
Apr 30 08:35:40 php: : Processing start -
Apr 30 08:35:40 php: : Not a valid interface action ""
Apr 30 08:35:40 php: : Processing -
Apr 30 08:35:40 php: : Not a valid interface action ""
Apr 30 08:36:27 dhcpd: Internet Systems Consortium DHCP Server V3.0.5
Apr 30 08:36:27 dhcpd: Copyright 2004-2006 Internet Systems Consortium.
Apr 30 08:36:27 dhcpd: All rights reserved.
Apr 30 08:36:27 dhcpd: For info, please visit http://www.isc.org/sw/dhcp/

I manually restarted the DHCP server at 8:36. The LAN (vr0) interface is not bridged with anything. I do have an enabled Opt1 that DHCP also listens on, but it's connected to a home router device…so it doesn't go down and up regularly. I'm not seeing any relevant information in the logs that would indicate why it's not working.

hoba · Apr 30, 2008, 4:49 PM

When the client is not able to receive a lease from the dhcp server do you see anything in the dhcp tab of the systemlogs? does status>services show the dhcp server still running?

mastermindpro · Apr 30, 2008, 4:57 PM

I don't see any errors in the DHCP logs…in fact, nothing appears during the time the client is trying to get a lease. The service claims to be running on the status page, but simply doesn't hand out leases unless it is restarted while the interface is up.

hoba · Apr 30, 2008, 5:03 PM

I assume we are talking about 1.2 release and not some beta or rc or even 1.0.1 version?

mastermindpro · Apr 30, 2008, 5:04 PM

You are correct…1.2 Embedded.

Perry · Apr 30, 2008, 5:06 PM

Did you confirm that you are using a crossovercable?

mastermindpro · Apr 30, 2008, 5:08 PM

I'm using a patch, but the laptop auto-MDI-X's it. Bear in mind it does work and pass data if I restart the DHCP server after the interface comes back up and force the laptop to renew it's lease.

hoba · Apr 30, 2008, 6:27 PM

Try to add an afterfilterchangesshellcommand-tag (see http://blog.pfsense.org/?p=31) to automatically restart the dhcp server on interface linkup. You'll have to download the config.xml and manually add a section to it and reupload it again.