VLAN Tagging breaks DHCP on cabled connections (RT-AC88U)

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frankiehmm
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Joined: 09 Dec 2017
Posts: 17

PostPosted: Sun Dec 10, 2017 18:23    Post subject: VLAN Tagging breaks DHCP on cabled connections (RT-AC88U) Reply with quote
I am using this build: r33986, on a RT-AC88U.

These are my steps:


    - Firmware update (r33986)
    - wait until it's finished, login to the webgui and set username/password.
    - via telnet: erase nvram, reboot

    - At this moment DHCP supplies IP addresses to cabled and wifi connections
    - At this moment I took a "snapshot" of nvram show. (DHCP Working)
    - Now I set the VLAN the way I want it. Save it and Reboot the router.
    - Now the DHCP only supplies IP addresses to wifi connections and NOT cabled anymore.

    - If I put the VLAN GUI page back to it's original settings (by hand, and using the GUI), and save and reboot. The problem persists.
    - At this moment I took a "snapshot" of nvram show and compared it. (DHCP Not working)


The nvram show contents are different on these settings:

is_default
DHCP Working: 1
DHCP Not working: 0

port0vlans, port1vlans, port2vlans, port3vlans
DHCP Working: 2
DHCP Not working: 2 18 19 21

vlans
DHCP Working: 0
DHCP Not working: 1

I think this must be a bug? What could be the cause? Suggestions?



Capture.PNG
 Description:
My "desired" VLAN settings
 Filesize:  67.84 KB
 Viewed:  2594 Time(s)

Capture.PNG




Last edited by frankiehmm on Sun Dec 10, 2017 20:20; edited 1 time in total
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mache
DD-WRT User


Joined: 11 Apr 2010
Posts: 311
Location: San Francisco Bay Area

PostPosted: Sun Dec 10, 2017 19:52    Post subject: Reply with quote
Check out my configuration for multiple VLANs in this Sat Jul 26, 2014 1:45 pm post in this thread https://www.dd-wrt.com/phpBB2/viewtopic.php?t=263155&postdays=0&postorder=asc&start=0.
frankiehmm
DD-WRT Novice


Joined: 09 Dec 2017
Posts: 17

PostPosted: Sun Dec 10, 2017 19:55    Post subject: Reply with quote
mache wrote:
Check out my configuration for multiple VLANs in this Sat Jul 26, 2014 1:45 pm post in this thread https://www.dd-wrt.com/phpBB2/viewtopic.php?t=263155&postdays=0&postorder=asc&start=0.


I've read it, but it's not my problem on how to get VLANs working. I have this same setup working on a RT-AC68U. And on that build the DHCP Server keeps working on cabled connections. I have to use a newer build, because RT-AC88U is only supported in the newer builds, but those newer builds seem to break the DHCP server for cabled connections.

Anyway, it must be a bug when I set it back to defaults using the GUI and never get a cabled DHCP server back.
mache
DD-WRT User


Joined: 11 Apr 2010
Posts: 311
Location: San Francisco Bay Area

PostPosted: Sun Dec 10, 2017 20:13    Post subject: Reply with quote
I would check the CLI (either through SSH or Telnet) to make sure that:
Code:
# nvram show | grep vlan.*ports
# nvram show | grep port.*vlans
# nvram show | grep vlan.*hwname
Are all correct.
frankiehmm
DD-WRT Novice


Joined: 09 Dec 2017
Posts: 17

PostPosted: Sun Dec 10, 2017 20:20    Post subject: Reply with quote
vlan.*ports are unchanged between working and not working.
vlan.*hwname are unchanged between working and not working.
port0vlans, port1vlans, port2vlans, port3vlans are all 2 when working, but are 2 18 19 21 when not working.
the 'vlans' option itself is 0 when working and 1 when not working.
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