[FS#673] DHCP not working for some devices

LEDE Bugs lede-bugs at lists.infradead.org
Sun Apr 2 09:12:35 PDT 2017


A new Flyspray task has been opened.  Details are below. 

User who did this - pmgp (mgondium) 

Attached to Project - LEDE Project
Summary - DHCP not working for some devices
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Somewhere between r3293 and r3901, DHCP stopped working for some network devices.
In my case, two same model printers are left in the dark, while all other devices work as usual. Manually setting IP on the printer makes it work again.

r3901:
Sat Apr  1 13:04:43 2017 daemon.info dnsmasq-dhcp[1558]: DHCPDISCOVER(br-lan) a4:ee:57:78:redacted
Sat Apr  1 13:04:43 2017 daemon.info dnsmasq-dhcp[1558]: DHCPOFFER(br-lan) 192.168.10.136 a4:ee:57:78:redacted
Sat Apr  1 13:04:46 2017 daemon.info dnsmasq-dhcp[1558]: DHCPDISCOVER(br-lan) a4:ee:57:78:redacted
Sat Apr  1 13:04:46 2017 daemon.info dnsmasq-dhcp[1558]: DHCPOFFER(br-lan) 192.168.10.136 a4:ee:57:78:redacted
Sat Apr  1 13:04:52 2017 daemon.info dnsmasq-dhcp[1558]: DHCPDISCOVER(br-lan) a4:ee:57:78:redacted
Sat Apr  1 13:04:52 2017 daemon.info dnsmasq-dhcp[1558]: DHCPOFFER(br-lan) 192.168.10.136 a4:ee:57:78:redacted
Sat Apr  1 13:04:58 2017 daemon.info dnsmasq-dhcp[1558]: DHCPDISCOVER(br-lan) a4:ee:57:78:redacted
Sat Apr  1 13:04:58 2017 daemon.info dnsmasq-dhcp[1558]: DHCPOFFER(br-lan) 192.168.10.136 a4:ee:57:78:redacted
Sat Apr  1 13:05:04 2017 daemon.info dnsmasq-dhcp[1558]: DHCPDISCOVER(br-lan) a4:ee:57:78:redacted
Sat Apr  1 13:05:04 2017 daemon.info dnsmasq-dhcp[1558]: DHCPOFFER(br-lan) 192.168.10.136 a4:ee:57:78:redacted

(No address is received.)

I've confirmed with different router devices including two TPLINK 710N (ar71xx) and one ARCHER C20i (mt7620).
Running r3293 makes all go back to normal.

r3293:
Sat Apr  1 12:56:21 2017 daemon.info dnsmasq-dhcp[1125]: DHCPDISCOVER(br-lan) a4:ee:57:78:redacted
Sat Apr  1 12:56:21 2017 daemon.info dnsmasq-dhcp[1125]: DHCPOFFER(br-lan) 192.168.30.136 a4:ee:57:78:redacted
Sat Apr  1 12:56:21 2017 daemon.info dnsmasq-dhcp[1125]: DHCPREQUEST(br-lan) 192.168.30.136 a4:ee:57:78:redacted
Sat Apr  1 12:56:21 2017 daemon.info dnsmasq-dhcp[1125]: DHCPACK(br-lan) 192.168.30.136 a4:ee:57:78:redacted


Were there changes to dnsmasq or the networking stack between these revisions?
This problem looks strangely familiar to a wrong VLAN, only no VLANs here...


 

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=673



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