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Frequent Contributor II
Posts: 144
Registered: ‎01-21-2015

Ping drops while client is roaming between APs

Today I was doing post survey for on customer & noticed that while a client is roaming between APs there is one ping drops. Client was pinging google.com.

So my question is:

Is this a expected behaviour ?

Or I need to work on this to fix .

rana
Guru Elite
Posts: 21,026
Registered: ‎03-29-2007

Re: Ping drops while client is roaming between APs

It is very typical to see one or two ping drops during a roam.  Clients can scan other channels while roaming and pings are not retried, so it is typical.



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Community Administrator
Posts: 2,254
Registered: ‎12-03-2013

Re: Ping drops while client is roaming between APs

Second that.

 

In network verification testing this behavior was saw at every site.

CWNA, ACMP, Security +
Guru Elite
Posts: 8,458
Registered: ‎09-08-2010

Re: Ping drops while client is roaming between APs

Normal

Tim Cappalli | Aruba Security TME
@timcappalli | timcappalli.me | ACMX #367 / ACCX #480
Frequent Contributor II
Posts: 144
Registered: ‎01-21-2015

Re: Ping drops while client is roaming between APs

Thanks,

May I know the reason behind this.
Sent from Outlook Mail for Windows 10 phone
rana
Community Administrator
Posts: 2,254
Registered: ‎12-03-2013

Re: Ping drops while client is roaming between APs

It's because of the re-association process that go on "behind the scenes".

CWNA, ACMP, Security +
Guru Elite
Posts: 21,026
Registered: ‎03-29-2007

Re: Ping drops while client is roaming between APs


Rana wrote:
Thanks,

May I know the reason behind this.
Sent from Outlook Mail for Windows 10 phone

- "Clients can scan other channels while roaming and pings are not retried, so it is typical.".  While a client is scanning other channels, it is not processing traffic on the data channel.  

- There also could be contention:  Wireless is a shared mechanism and sometimes traffic does not go through the first time.  Combine that with scanning when changing access points, and there could be a drop or two.

- Pings are never retried, so if it is missed, there is nothing further up in the application layer to retry a ping that is missed; it is just missed



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

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