Slow transfer rates

I am currently doing a replication from my barracuda appliance (backups) to the cloud (barracuda.com).  The techs at Barracuda say that my transfer rate is 297Kb.My upload speeds slow down to more than half of what I should be getting from my ISP and I also have a high ping rate to my isp  about 340ms .    My barracuda appliance is behind my firewall.  I have tested for packet drops on the firewall using the ip of my appliance.  There are 0 packet drops.   Also when I ping to hosts on my network including the barracuda appliance the ping rate is less than 1 ms.

However, when  I remove the appliance from the lan.  The upload speed goes back up to what it should be and the ping rate to my isp goes down to about 8ms.

Any ideas as to what would be causing the slow transfer rate?
MomForLifeAsked:
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atlas_shudderedSr. Network EngineerCommented:
If you ping from the firewall to barracuda cloud, what is response time?
MomForLifeAuthor Commented:
I cannot ping my firewall.  Sonic wall recommends that we do not create an exception to ping it.  However we did test the packets leaving the sonic wall  and there was no packet loss.
atlas_shudderedSr. Network EngineerCommented:
Sorry so long to get back to you.  One general question and then some input - when you upload, does performance go down for all other access as well or are you only seeing slowness in the upload to barracuda itself?

Have you checked the interfaces associated to the outbound path for drops inside the interface counters?  This could be an indicator of one potential point of failure, buffer misses on the device interface itself, on the firewall interfaces involved or a switch in between.

The second potential issue could be within the spam filter itself where the upload process is consuming resources leading to an over-utilization and slow down on the device itself.  To start troubleshooting this you would  want to look at proc and memory utilization on the device before, during and after the upload.

The third possibility is on the firewall but the same as the second.  To troubleshoot, you would look at the same resources on the firewall as you did on the barracuda.

The final point of potential is your ISP itself.  If you are using a carrier like ATT, Level 3 or XO, then the probability is low but if you are using someone like Comcast or TW then the risk goes up.  In the latter case, the concern would be that you are using a standard connection rather than a "business" link.  In the both cases, the connectivity provided is a guaranteed max, meaning that you can see access up to that rate.  If you read the fine print, you will find verbiage to the affect of "these speeds are not subject to limitation due to network utilization".  Translation, "you are participating in a shared bus and for that reason, one you may experience decreased performance during peak utilization and two, we reserve the right to police your traffic if it is determined to negatively impact other customers in your ring".

Have a look about and we can go from there.

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atlas_shudderedSr. Network EngineerCommented:
No further input from asker.  Requesting closure.
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