Re: [WIRELESS-LAN] Wireless Instability issues?

[Carlo Terminiello]

Hi,

 

Sounds similar to the Apple ARP spoofing problem from the summer that hit a few 
manufacturers that use local switching models, I’d start with checking ARP 
tables on client, AP, switch, router to make sure everything is as it should be.

 

Rgds

 

Carlo

 

From: The EDUCAUSE Wireless Issues Community Group Listserv 
 on behalf of "Glassman, Stephen" 

Reply-To: The EDUCAUSE Wireless Issues Community Group Listserv 

Date: Saturday, 11 January 2020 at 15:18
To: 
Subject: Re: [WIRELESS-LAN] Wireless Instability issues?

 

Hi John, 

 

We’ve experienced intermittent issues with our AP230’s since around 
Thanksgiving but are only hearing about it from others-we have not witnessed 
the issue first hand.  The symptom seems to be that the client is connected but 
cannot get to the internet or if they can it’s really slow but the issue seems 
to come and go and it’s certainly not affecting everyone….



On Jan 11, 2020, at 1:01 AM, John Rodkey  wrote:

 

Are others who are  using Aerohive 650 experiencing instability issues?  We 
have experienced a rather extensive problem that came with sudden onset about 
1/4/2020 .

Clients appear to be able to connect to the AP, get an IP and are able to ping 
the default gateway, but not beyond.  The ethernet network is unaffected, and 
the gateway is able to ping the rest of the network and the AP, but not the 
client.

 

John

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Re: [WIRELESS-LAN] Wireless Instability issues?

[Christina Klam]

Carlo

Can you send more information on the Apple ARP issue you are referring to?  We 
may be hitting it to on our Meraki network. 

Thanks 
Christina 

Sent from my iPhone

> On Jan 13, 2020, at 05:09, Carlo Terminiello  wrote:
> 
> 
> Hi,
>  
> Sounds similar to the Apple ARP spoofing problem from the summer that hit a 
> few manufacturers that use local switching models, I’d start with checking 
> ARP tables on client, AP, switch, router to make sure everything is as it 
> should be.
>  
> Rgds
>  
> Carlo
>  
> From: The EDUCAUSE Wireless Issues Community Group Listserv 
>  on behalf of "Glassman, Stephen" 
> 
> Reply-To: The EDUCAUSE Wireless Issues Community Group Listserv 
> 
> Date: Saturday, 11 January 2020 at 15:18
> To: 
> Subject: Re: [WIRELESS-LAN] Wireless Instability issues?
>  
> Hi John,
>  
> We’ve experienced intermittent issues with our AP230’s since around 
> Thanksgiving but are only hearing about it from others-we have not witnessed 
> the issue first hand.  The symptom seems to be that the client is connected 
> but cannot get to the internet or if they can it’s really slow but the issue 
> seems to come and go and it’s certainly not affecting everyone….
> 
> 
> On Jan 11, 2020, at 1:01 AM, John Rodkey  wrote:
>  
> Are others who are  using Aerohive 650 experiencing instability issues?  We 
> have experienced a rather extensive problem that came with sudden onset about 
> 1/4/2020 .
> Clients appear to be able to connect to the AP, get an IP and are able to 
> ping the default gateway, but not beyond.  The ethernet network is 
> unaffected, and the gateway is able to ping the rest of the network and the 
> AP, but not the client.
>  
> John
> **
> Replies to EDUCAUSE Community Group emails are sent to the entire community 
> list. If you want to reply only to the person who sent the message, copy and 
> paste their email address and forward the email reply. Additional 
> participation and subscription information can be found at 
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>  
> **
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> 
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RE: Wireless Instability issues?

[Mark Reboli]

We went through this issue.  Below are the highlights from our point-of-view:

Realizing the issue:
Take a look at the arp table on a pc that is not working.  Specifically look 
for the gateway IP address/MAC address.
Check that IP address/MAC address against your real gateway.
If it’s the apple issue, they will not match!

Fix in our case:
Meraki has had a patch out to address this in September/October 2019.

What the issue looks like:
Apple devices go into sleep mode, change their settings and start broadcasting 
that they are the gateway.  Other devices see this and believe it.  These other 
devices then do not have the correct gateway and cannot go out on the Internet. 
 This presents itself as an intermittent/inconsistent issue that comes and goes 
and effects some not all.


Sorry for my brevity,

M
Mark Reboli
Network/Telecom Manager
Misericordia University
(570) 674-6753

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From: The EDUCAUSE Wireless Issues Community Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Christina Klam
Sent: Monday, January 13, 2020 8:44 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] Wireless Instability issues?

External Email: Do not click any links or open any attachments unless you trust 
the sender and know the content is safe.
Carlo

Can you send more information on the Apple ARP issue you are referring to?  We 
may be hitting it to on our Meraki network.

Thanks
Christina
Sent from my iPhone


On Jan 13, 2020, at 05:09, Carlo Terminiello 
mailto:ca...@repyconsulting.com>> wrote:

Hi,

Sounds similar to the Apple ARP spoofing problem from the summer that hit a few 
manufacturers that use local switching models, I’d start with checking ARP 
tables on client, AP, switch, router to make sure everything is as it should be.

Rgds

Carlo

From: The EDUCAUSE Wireless Issues Community Group Listserv 
mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> 
on behalf of "Glassman, Stephen" 
mailto:sglass...@choate.edu>>
Reply-To: The EDUCAUSE Wireless Issues Community Group Listserv 
mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>>
Date: Saturday, 11 January 2020 at 15:18
To: 
mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>>
Subject: Re: [WIRELESS-LAN] Wireless Instability issues?

Hi John,

We’ve experienced intermittent issues with our AP230’s since around 
Thanksgiving but are only hearing about it from others-we have not witnessed 
the issue first hand.  The symptom seems to be that the client is connected but 
cannot get to the internet or if they can it’s really slow but the issue seems 
to come and go and it’s certainly not affecting everyone….



On Jan 11, 2020, at 1:01 AM, John Rodkey 
mailto:rod...@westmont.edu>> wrote:

Are others who are  using Aerohive 650 experiencing instability issues?  We 
have experienced a rather extensive problem that came with sudden onset about 
1/4/2020 .
Clients appear to be able to connect to the AP, get an IP and are able to ping 
the default gateway, but not beyond.  The ethernet network is unaffected, and 
the gateway is able to ping the rest of the network and the AP, but not the 
client.

John
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Google Stadia

[Howard, Christopher]

We've had a couple students show up with Google Stadia controllers and 
Chromecasts wanting to play (stream) games.  Needless to say, it wasn't working.

We use a NAC and we have game consoles segregated onto their own vlan that does 
not use NAT, so we don't get NAT related complaints related to traditional 
consoles.  We also have a separate vlan for Chromecasts and Apple TVs so we can 
use Airgroup to allow casting.  We started out setting these up following our 
normal method - the Stadia controller on the game console vlan and the 
Chromecast on the casting vlan.  It doesn't work.  The only feedback we get 
from the Stadia controller is an orange blinking light, which means it's not 
able to connect.  Some googling leads us to a document that says the controller 
and the chromecast need to be on the same network.

Ok, so what does "same network" mean?  Is it the same SSID, the same vlan, the 
same public IP address?

They were already on the same SSID, so we know that's not it.  We looked at 
firewall logs since they were on different vlans (with a firewall in between) 
and there was no traffic attempts between the two devices.

Next, we moved them both to the game console vlan with public IP addresses 
directly on both devices with no luck.  We also moved both to the casting vlan 
and made sure Airgroup was set up accordingly with no luck.  So it doesn't look 
like same vlan helps, and public IPs directly on devices and casting rules 
don't make a difference.

Finally, we did what I was really hoping would not fix it.  We set up a rule so 
that both devices NAT out to the same public IP address.  And poof, it starts 
working.

Our campus is large enough that we have big pools dedicated to NAT so for the 
most part everyone gets a dynamic 1:1 and only start sharing after the pool is 
full.  There appear to be 3 options here; 1.) create a new vlan just for Stadia 
and put all chromecasts and controllers there with a NAT rule to funnel them 
all out the same single public IP, 2.) create individual NAT rules for each 
person who wants to use Stadia, 3.) don't support Stadia until Google makes it 
better. For now, we are just going to have to tell students that Stadia isn't 
going to function here, which is something I don't really like to do.

Has anyone else encountered these or have any other knowledge that would help?  
Documenation on this is scarce and only through tinkering did we stumble upon 
the fix.  This appears to be yet another device that is designed to only work 
at home and not on enterprise networks.

Christopher Howard
Senior Network Engineer
University of Tennessee at Chattanooga
christopher-how...@utc.edu


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