Issues with getting correct download speeds

We're currently dealing with the exact same situation for multiple customer locations where the ISP/modem is from Charter-Spectrum in mainly TX or surrounding states. We tested almost everything on the other end of IPSec tunnel (FGT as IPSec concentrator) using a test FG60D here in NW over other vendor like Comcast and CenturyLink. And ruled out both sides of FGTs for the slowdown.

Then I found a post at Expert Exchange stating Spectrum's Hitron modem/router was slowing down ONLY VPN over the cable internet while the speed test without VPN shows full bandwidth. The guy persuaded Spectrum's support to get the modem/router replaced to Ubee's, then the problem was resolved.

We're trying to do the same at all those customer locations where they got Hitron mondem/router but having hard time to persuade them to replace or can't find Ubee modem to replace with. Please let me know when you get it reolved by Spectrum. I'll update when we get any progress.

Toshi

I have an update on our side. We got a Spectrum Hitron modem replaced with Ubee's at one of customer locations with Spectrum. This location's internet comes over FGT(CPE) to FGT (IPsec consentrator) and even routed through their HQ MPLS circuit to go though their own FW there.

Before the modem swap, download speed was about 16-17Mbps for this 60M/4M circuit. After the swap, download speed is about 60Mbps. So it solved the problem.

Your current situation might be caused by another factor on their network if the circuit is beyond 60M level. 

Same issue here, just in case was there any resolution?

cnoche@verticalsol.com wrote:

Device : fortigate 60d

ISP: Spectrum

Line speed :300 down, 24 up.

 

When behind the firewall we are getting between 54-70 down and 24 up. From the modem we are getting 300/24. I have worked with tech support but was not able to resolve the issue. I have disabled utm and changed the wan port to be 1gb instead of auto negotiating. Still no luck

 

I have seen the fortinet  not get the full bandwidth on several of my customers who are supposed to download  more than 200. Wondering if anybody else has seen this issue?

Bob