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Emerging Member
Posts: 41
Registered: ‎12-23-2014
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BUG [NanoHD|: broadcast and multicast leaking between VLANs

I'm using WPA Enterprise with RADIUS assigned VLAN with 18 Unifi APs.

For years everything was working as expected.

Since a couple of weeks, users have been reporting problems connecting to the network and regular disconnections.

 

After invesigation, the problem occured after I replaced 2 broken UAP-AC-PRO with 2 new UAP-nanoHD.

So I went with Wireshark to figure out what was happening with the DHCP:

I'm seeing broadcast and multicast packets from other VLANs and apparently my own broadcasts (DHCP, ARP) are blocked somewhere. 

Leaking VLANs are from other users connected on the same antenna, so the leak is in the antenna bridging layer.

 

If I move near a UAP-AC-PRO instead I get an address immediately and don't see any broadcast nor multicast from other VLANs. So it confirms it is a UAP-nanoHD problem.

 

In the early times (beta) of RADIUS assigned VLAN on UAP-AC-PRO there was the same problem.

 

Example traffic:

Legit assigned VLAN subnet: 10.10.83.0/24

Seen:

Src: 10.10.4.103. Dst: 10.10.4.255

Src: 10.10.3.101 Dst: 224.0.0.251

Plenty of ARP "Who has?" from other subnets

 

Captures available on request

 

UniFi AP-nanoHD firmware: 4.0.21.9965

Manager: 5.10.17 (Build: atag_5.10.17_11638)

 

Senior Member
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Re: BUG [NanoHD|: broadcast and multicast leaking between VLANs

Hello @scapal,

 

I believe @UBNT-AngusL  is already looking into this.

@UBNT-AngusL  could you confirm this?

 

 

Regards,

Glenn R.

Cloud Hosted Controllers | Glenn R. | UniFi Installation/Easy Update Scripts | UniFi-Video Installation Scripts | UniFi-VoIP Installation Scripts
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Emerging Member
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Re: BUG [NanoHD|: broadcast and multicast leaking between VLANs

[ Edited ]

I don't think it is the same problem as the other posts I saw were configuration related.

Here I have 16 UAP-AC-PRO working properly on that site, only the 2 UAP-NanoHD are exhibiting the problem.

 

@UBNT-FrankC corrected the very same problem for 2nd gen AC antennas:

https://community.ubnt.com/t5/UniFi-Wireless-Beta/2ND-GEN-AC-ONLY-RADIUS-controlled-VLAN-firmware/m-...

New Member
Posts: 3
Registered: ‎06-19-2018

Re: BUG [NanoHD|: broadcast and multicast leaking between VLANs

I have the exact symptoms you're describing with (unfortunately) 18 nanoHDs and RADIUS assigned VLANs. I'm seeing broadcast and multicast traffic from other VLANs and subnets, mDNS and ARP requests. If my capturing device is associated with a UAP-HD or a UAP-AC-M, the problem instantly dissapears. 

 

I'm having occasional DHCP failures also. I was having a large number until I set the ip helper-address for the DHCP server on the VLAN in which it operates, which isn't something I'd expect to have to do it appears to be it's compensating for the issue in some way.

 

Firmware: 4.0.21.9965, Controller: 5.10.17.1

Emerging Member
Posts: 41
Registered: ‎12-23-2014
Kudos: 15
Solutions: 2

Re: BUG [NanoHD|: broadcast and multicast leaking between VLANs

@UBNT-AngusL @UBNT-MikeD , could you take a look at this problem please?

 

Ubiquiti Employee
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Re: BUG [NanoHD|: broadcast and multicast leaking between VLANs


@scapal wrote:could you take a look at this problem please?

This wasn't properly fixed until 4.0.21. That said it actually looks like these fixes were not ported for nano-HD/IW-HD (meaning this issue would still be present there). I actually don't know much beyond that right this moment, but I'll looko into that and follow up.

 

Cheers,

Mike

Emerging Member
Posts: 41
Registered: ‎12-23-2014
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Re: BUG [NanoHD|: broadcast and multicast leaking between VLANs

Hi Mike,

 

Any news about this problem?

Is there a way I can help from my side?

 

Cheers,

Pascal

New Member
Posts: 33
Registered: ‎06-21-2013
Kudos: 1

Re: BUG [NanoHD|: broadcast and multicast leaking between VLANs

+1  Any news?  I was about to order a bunhc of nanoHD's but this bug would bite me so I am holding off until I hear if it has been resolved.

 

thx

mike

 

New Member
Posts: 3
Registered: ‎06-19-2018

Re: BUG [NanoHD|: broadcast and multicast leaking between VLANs

This issue is really hurting us still. I'd love to see a fix for this soon!

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Re: BUG [NanoHD|: broadcast and multicast leaking between VLANs

Hello @steve-2525,

 

Have you already tried the latest BETA Firmware? ( follow this article to sign up for BETA )

 

 

Regards,

Glenn R.

Cloud Hosted Controllers | Glenn R. | UniFi Installation/Easy Update Scripts | UniFi-Video Installation Scripts | UniFi-VoIP Installation Scripts
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New Member
Posts: 3
Registered: ‎06-19-2018

Re: BUG [NanoHD|: broadcast and multicast leaking between VLANs

Thanks for that. I gave the beta a shot on one of our devices, and also a device in a test site with minimal config, but unfortunately I'm still seeing the same behaviour Man Sad

Senior Member
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Re: BUG [NanoHD|: broadcast and multicast leaking between VLANs

Hello @steve-2525,

 

Than patiently wait for MikeD to come back with more information.

 

 

Regards,

Glenn R.

Cloud Hosted Controllers | Glenn R. | UniFi Installation/Easy Update Scripts | UniFi-Video Installation Scripts | UniFi-VoIP Installation Scripts
USG-XG-8 • USG-4-PRO • USG
US-XG-16 • US-48-500W • US-24-POE-250W 2x • US-16-POE-150W 3x • US-24 • US-8-150W • US-8
UAP XG • UAP-SHD • UAP-HD • UAP-NanoHD 2x • UAP-AC-PRO 2x • UAP-AC-LITE • UAP-AC-IW • UAP-AC-M • UAP-AC-M-PRO 2x
UAS-XG • UCK-G2-PLUS • UCK-G2 • UCK
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