help pinpointing network issue

[Joe_231]

Recently subscribed to a 30 Mbps Internet service but none of the devices on my network are seing anything near that speed when connecting to the Internet. Network has three segments, each served by 1 HP procurve 5406zl. There is one main segment which has the port connected to our Internet router and 2 additonal HP procurve 5406zls, which are connected to the main procurve using manual trunking of two ports (so 2 gigabit ports connecting segment 1 to segment 2 and 2 additonal gigabit ports connecting segment 1 to segment 3). N the port status page all the trunk ports are showing as 1000FDx, flow control off and lacp disabled. I have done extensive searching for any malware that could be taking up bandwidth (only have ~150 nodes), but all seems clear. Utilization reports on my Internet service consistently show that we are barely scratching the surface and using about 3-5 Mbps during business hours. Internal network services like email and file transfers seem fine and fast, but Internet activity like downloading large files or watching video is extremely slow. I've used the argonne natinoal lab ndt server to test my Internet connection and it tells me that 'network based flow control limits the throughput to 1.83 Mbps. The Internet provider reports that all is clear on their end and it must be something in our network. I've tried manually setting link speeds and enabling\disabling flow control on ports in the switches with no apparent effect. Anyone have any ideas of what might be wrong?

P.S. This thread has been moved from Switches, Hubs, Modems (Legacy ITRC forum) to ProCurve / ProVision-Based. -HP Forum Moderator

[Shadow13]

what Internet router do you have ?

Please check the status of the router and if it is a normal DSL modem or something like that try to connect a device to it directly and test the connection, maybe the issue is with the router.

Regards

[Joe_231]

I have a netgear router. I had attached a laptop direct to the router and disconnected the lan so that the laptop was the only network device. I got slightly better results that way. Then I conected directly to the ISP based router with the laptop and again saw a small increase in performance. I gethered all my screen shots and test results and sent it to my ISP. They checked out their router and found duplexing errors. They reset their router from mnaully configured 100 MB fDx to Auto and since then we're speeding along very well.

[Alan_152]

Do you have a CIR (committed information rate) guarantee for 30Mbps, or is this just their advertised rate? Is this cable or fiber?