topic Re: High Ping times on Speedtest.net and slow web browsing in General Topics

High Ping times on Speedtest.net and slow web browsing

jenkinsp — Thu, 25 Apr 2013 04:46:02 GMT

We have been experiencing very high ping times on speedtest.net (6336+ seconds) and very slow web browsing to international websites (National sites appear to be running fast).

(I understand that speedtest.net cheats and sends very small HTML files to determine ping time to sites)

We placed a PC directly on the external side of the firewall and ping times and browsing was fast, but behind the firewall we experienced these problems. We rebooted the firewall and the problems all went away, ping times fast and browsing speed was fast.

The majority of web traffic goes through a proxy (A service rule to allow port 3128 to a linux proxy) but even allowing traffic direct to the internet from a workstation was showing poor results until the firewall was rebooted.

CPU usage was very low on the dataplane (30% or so). Around 1500 sessions running through the firewall at the time and had been working fast previously.

Does anyone have any ideas on what might cause this or troubleshooting for this issue? (I dont want to reboot the firewall if this happens again!)

Thanks

Re: High Ping times on Speedtest.net and slow web browsing

UhMayYeah — Thu, 25 Apr 2013 05:06:20 GMT

Cause seems to be related to the State of the device but could be various factors :

To name a few:

1>Hardware Link Settings particularly failed Auto-Negotiation >show interface hardware

2>Exhaustion of DataPlane Buffers. : check: >debug dataplane pool statistics

3>Attacks (In some cases)

4>Proxy Reusing a Source Port, which is being used by an existing sessions. > Packet capture and Global counter based Troubleshooting .

Ref :

I would suggest calling up support if the issue resurfaces for Live Debugging.

-Ameya

Re: High Ping times on Speedtest.net and slow web browsing

jenkinsp — Mon, 29 Apr 2013 01:33:53 GMT

Thanks, that is some useful things to check - It seems to be behaving itself for now but I am keeping an eye on it!