troubleshooting Question

Gigabit good but 100M and 10M very slow

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wzn asked on
Networking Hardware-OtherSwitches / Hubs
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I work in a 30 workstations company.

I've replaced an old hub on which every one was connecting at 100M / Half duplex for a brand new Allied telesys gigabit switch model AT-GS950/48

Everything seemed to be working fine, but some users began complaining about slow startup time of a network application.

Upon investigation, I discovered that every workstation connected at 100M Full (or below) gets very erratic connection speed, moving from 6Mbytes/sec to under 300Kbytes/sec, back and forth all the time.

Gigabit connections on the other hand, gets very stable speed over 30Mbytes/sec.

The Internet connection is going through a pfSense router which is splitting it in 3 VLANs.

The switch is in production now, so I have little lattitude in terms of testing. Any idea what the problem is?

Thanks in advance.

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