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Traffic buffered every 70 seconds.

Occasional Contributor

Traffic buffered every 70 seconds.

Hello,

Some people in our organization are complaining about intermitting voice calls while using pulse secure client.
When I take a TCP dump I can see a pattern in the traffic flows. Every 70 seconds the traffic sent upstream towards back end is buffered for some time.
So no packets are lost, they are just queued for some time and then all released in one time.

The time of the buffering can be different. For some people this is some milliseconds, the other extreme is seconds.
I think this is for all the traffic, not only voice, but since voice is very delay sensitive, this is the application where it is noticed by the end users.

Does anyone know where to look? Or any ideas what could explain this? It's certainly not a random thing, it's "something" which actively causes this behavior.

Thanks in advance.




Software backend 8.1R8
Software on client PC's 5.1.8
5 REPLIES 5
Community Manager

Re: Traffic buffered every 70 seconds.

This could be related to load on the PCS device. Do you have a open support case? Please gather screenshot of the graph that over 1 day and 1 week. Also, provide times when users are experiencing issues.

If these type of issues are occurring only during "peak" hours, then this is a strong indication there could be too much load on the device.
Occasional Contributor

Re: Traffic buffered every 70 seconds.

Some people in our organization have this problem, while others don't.
It happens during peak moments (2400 concurrent sessions), as well during much calmer moments.
We recently had a peak of 5600 concurrent sessions, and there were no more problems then normal days, so it's not related to load.

So to conclude, some people have this problem, other people never have this problem. Time of the day, load, ... makes no difference.
Moderator

Re: Traffic buffered every 70 seconds.

Do you see a jump in CPU or throughput when this happens?
Are the impacted users those with smaller connections?
Highlighted
Occasional Contributor

Re: Traffic buffered every 70 seconds.

No, the users experiencing this are random (or at least, they appear to be random).
No CPU or memory spikes to see.
Moderator

Re: Traffic buffered every 70 seconds.

OK.
Do you have multicast enabled on the roles (Users>User Roles>roleName>VPN Tunneling); if yes, does toggling this change the behavior?
Does forcing an SSL tunnel rather than ESP tunnel make a positive impact?
If you have an appliance with SSL acceleration enabled (Maintenance>System>Options, Hardware Acceleration), does disabling this have a positive impact?