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New Member
Posts: 4
Registered: ‎06-25-2015

Re: 3.9.15.8011 blocks DHCP

Ok i will try to search for a refund or RMA but do you know if I return the switches to the firmware 3. 9. 6 can I find stability because that's what I need now I'm in a really hurry because it's a big deployment and I needed stable ASAP thank you very much

New Member
Posts: 4
Registered: ‎01-29-2015
Kudos: 1

Re: 3.9.15.8011 blocks DHCP

As far as I know - the last known good firmware was 3.9.6.7613

Make sure you roll back to that and test.

New Member
Posts: 4
Registered: ‎06-25-2015

Re: 3.9.15.8011 blocks DHCP

[ Edited ]

Thanks!! Sorry to bother do I have to worry about dhcp snooping after downgrading? Just to understand better, if id stsy at latest firmware and disabled dhcp snooping the problem would continue nevertheless? 

 

The AP’s can stay at latest or do I have to revert them also (more than 110 on this site) 

 

Best Regards 

New Member
Posts: 4
Registered: ‎06-25-2015

Re: 3.9.15.8011 blocks DHCP

Does this problem has to do with multicast or dhcp snooping? I have more than 100 appletvs so that when users arrive the network gets down before users get in everything is great

 

Thanks ! 

Emerging Member
Posts: 45
Registered: ‎04-09-2015
Kudos: 8
Solutions: 1

Re: 3.9.15.8011 blocks DHCP

Why is this still an issue and why are Ubiquiti not doing anything about it? Someone from ubnt emailed me asking them to help with debugging the issue but because this destroys my network and I don't have any spare switches just lying around I couldn't help without UUBNT sending me a switch - I'm not ploughing more money into UBNT if they aren't going to even try and fix something after many people have reported it as broken.

Emerging Member
Posts: 45
Registered: ‎04-09-2015
Kudos: 8
Solutions: 1

Re: 3.9.15.8011 blocks DHCP

Maybe if we start @'ing UBNT staff something might happen - I hate doing it but I'm pretty fed up of no response on an issue that has now been ongoing for months

 

@ubnt-tim

 

@UBNT-cmb

New Member
Posts: 17
Registered: ‎05-06-2014
Kudos: 15

Re: 3.9.15.8011 blocks DHCP

More proof that if you have a working Unifi system you shouldn't sneeze, and you certainly shouldn't upgrade anything. Seems that new features continue to be prioritized over code quality, and they certainly are prioritized over bugfixes.
Member
Posts: 190
Registered: ‎02-12-2014
Kudos: 19
Solutions: 1

Re: 3.9.15.8011 blocks DHCP

What is strange is Firmware 3.9.6.7613 isnt even on the unifi firmware download page. Was it never an official release? Was there an official release that does not have this issue? 

 

I tried like hell today to get 2 48 ports to update to 3.9.6.7613 and they failed every time. I tried custom firmware link with https and http as well as winscp upload of the file and manual putty upgrade and still failed.... has something happened?

Emerging Member
Posts: 45
Registered: ‎04-09-2015
Kudos: 8
Solutions: 1

Re: 3.9.15.8011 blocks DHCP

Hopefully this is going to be fixed soon, been talking to ubnt devs. Also, I can probably send you a firmware that'll work if you need it - still have it in my downloads dir

Member
Posts: 190
Registered: ‎02-12-2014
Kudos: 19
Solutions: 1

Re: 3.9.15.8011 blocks DHCP

Thank you... I found a link in the forums to the firmware but for some reason it isn't on the official release page... additionally it kept failing on both 48s.. my impression was the switches all shared the same firmware... is there a different firmware for each switch?
Ubiquiti Employee
Posts: 6
Registered: ‎10-12-2017
Kudos: 1

Re: 3.9.15.8011 blocks DHCP

Hi,


Sorry for taking too long to provide a solution.

Finally I have a patched dev. firmware and the DHCP issue seems to be fixed in some users' environment.


Because this patch is still in the release process, and it would not be available until tag 4.0.7 is released.
If guys would like to try it first, just PM me.

 

 

Emerging Member
Posts: 45
Registered: ‎04-09-2015
Kudos: 8
Solutions: 1

Re: 3.9.15.8011 blocks DHCP

Sorry @FensterB - completely forgot to send it to you when I got back to the UK. As @ubnt-tim says he's got a build that works - I've tested it with him and I got my DHCP back Man Happy 

Ubiquiti Employee
Posts: 599
Registered: ‎02-13-2018
Kudos: 206
Solutions: 88

Re: 3.9.15.8011 blocks DHCP

The firmware mentioned by @ubnt-tim has been merged into a tagged release. The potential fix can be found by upgrading to any firmware after 4.0.7. The 4.0.8 firmware is still in beta testing but can be found by enabling early access on your account.

Adam Dipple | UniFi Support Team
New Member
Posts: 3
Registered: ‎09-20-2017
Kudos: 1

Re: 3.9.15.8011 blocks DHCP

Running 4.0.8.9618 on all switches and ap's. The dhcp problem is gone.

New Member
Posts: 4
Registered: ‎01-29-2015
Kudos: 1

Re: 3.9.15.8011 blocks DHCP

I think there are a lot of us who would like to understand why this took so long to resolve.

Some insight from @UBNT-AdamD @ubnt-tim or others into:

  • Why did this issue seem to be ignored when initially reported in the forum
  • Why did the issue seem to be ignored when reported in support tickets
  • How did identification of the issue by Ubnt take so long after the forum members had worked out what the root cause was?
  • Why was there no engagement from Ubnt in the forum?
New Member
Posts: 6
Registered: ‎05-17-2016

Re: 3.9.15.8011 blocks DHCP

I tried both the firmware from @ubnt-tim and 4.0.8.9618 buth DHCP problem still exists. I can't get my WDS up and running again. Is there any way to check if unifi is blocking my DHCP requests or any other thing I can do to get this fixed.

Ubiquiti Employee
Posts: 6
Registered: ‎10-12-2017
Kudos: 1

Re: 3.9.15.8011 blocks DHCP

In both firmware, there is a debug command to dump DHCP snooping log to syslog:
 

# telnet 127.0.0.1
(UBNT) >en
(UBNT) #debug dhcpsnooping packet

 Back to shell, an example output like this:

# tail -f /var/log/message | grep DHCP_SNP
Nov 13 11:03:41 US16P-150W daemon.info switch: DHCP_SNP: DHCP_REQUEST port:5 vlan:100 - client MAC:00:E0:9C:10:0F:29 requested IP:192.168.1.117 Nov 13 11:03:41 US16P-150W daemon.info switch: DHCP_SNP: DHCP_NACK port:1 vlan:100 - server IP:192.168.100.1, client MAC:00:E0:9C:10:0F:29 Nov 13 11:03:41 US16P-150W daemon.info switch: DHCP_SNP: DHCP_DISCOVER port:5 vlan:100 - client MAC:00:E0:9C:10:0F:29 Nov 13 11:03:42 US16P-150W daemon.info switch: DHCP_SNP: DHCP_OFFER port:1 vlan:100 - server IP:192.168.100.1, client MAC:00:E0:9C:10:0F:29 IP:192.168.100.11 Nov 13 11:03:42 US16P-150W daemon.info switch: DHCP_SNP: DHCP_REQUEST port:5 vlan:100 - client MAC:00:E0:9C:10:0F:29 requested IP:192.168.100.11 Nov 13 11:03:42 US16P-150W daemon.info switch: DHCP_SNP: DHCP_ACK port:1 vlan:100 - server IP:192.168.100.1, client MAC:00:E0:9C:10:0F:29 IP:192.168.100.11

 

Another method is, if you are using USG as DHCP server, a command can enable DHCP log as folloing:

(login to USG)
admin@ubnt:~$ configure
[edit]
admin@ubnt# set system syslog global facility daemon level debug
admin@ubnt# commit
[ system syslog ]
Stopping enhanced syslogd: rsyslogd.
Starting enhanced syslogd: rsyslogd.

[edit]
admin@ubnt# sudo su
root@ubnt:/home/admin#
root@ubnt:/home/admin# grep dhcpd /var/log/messages*

Those logs will help to clearfy the root cause.

New Member
Posts: 6
Registered: ‎05-17-2016

Re: 3.9.15.8011 blocks DHCP

@ubnt-tim I think I'm doing something wrong because I'm not seeing anything DHCP related in the logs.

 

This is what I'm doing:

 

- Logging in to the unifi controller

- Starting a debug terminal using the tools tab

- Issueing these commands in this order:

 

telnet 127.0.0.1

en

debug dhcpsnooping packet

q

 

tail -f /var/log/messages | grep DHCP_SNP

 

After that I'm not seeing anything in the log related to DHCP. Where do I go wrong?

Ubiquiti Employee
Posts: 6
Registered: ‎10-12-2017
Kudos: 1

Re: 3.9.15.8011 blocks DHCP

Oh, one more thing, you need to re-trigger the DHCP event after turning on logging, what is your device that need IP via DHCP ?
If it is a wired device, try to un-plug/plug ethernet port.
If it is a cellphone, try to re-enable the wireless, make sure the Access Point is also under that switch.
New Member
Posts: 6
Registered: ‎05-17-2016

Re: 3.9.15.8011 blocks DHCP

@ubnt-tim I did retrigger the DHCP events, both on wired and wireless devices. But nothing is logged. I looked at the logs of the switch where the devices are connected and on our core switch (the one where our DHCP-server is).

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