I've seen this a few times on Cisco switches; telnet to the switch and look
at the interface that is connected to the pfSense box (show int fastethernet
0/#) and see if it is running at full or half duplex.  If it's half, then
manually set the interface to full duplex with the following commands...

conf t
int fastethernet 0/$
duplex full
speed 100

You may need to power cycle the pfSense box but it should fix the issue.
Ensure that you save the config on the  Cisco switch with write memory.

Sorry for the simplicty, I don't know what level of Cisco you are...

Curtis LaMasters
http://www.curtis-lamasters.com
http://www.builtnetworks.com

On Thu, Jan 15, 2009 at 10:09 PM, Ugo Bellavance <[email protected]> wrote:

> Hi,
>
>        I'm trying to troubleshoot a problem on a PfSense 1.2-RELEASE,
> running on a P4 1.4, Hard-drive install, 1 GB RAM.  WAN is vr0 and Lan
> (vlan0, vlan1 and vlan2) is on fxp0. WAN is auto-sense, and ends up
> 100baseTX (half-duplex, I guess) and fxp0 is 100basetx <full-duplex>.  vr0
> is connected directly into the ISP's equipment, which is a Cisco switch.
>
> It's running BandwidthD and traffic shaping.  It is connected to 100-mbps
> link from an ISP, capped at 30 mbps.
>
> Average traffic in a day is 4.23mbps down, 2.44 mbps, historical maximum of
> 13.86 up and 9.62 down (not simultaneously).
>
>        The cpu usage averages 34%, memory usage  30%.  Most CPU usage seems
> to be coming from interrupt: 21.69% average.  System : 6.86,nice : 2.36,
> User 2.21.
>
>        They're experiencing performance problems since they upgraded from
> 15 mbps to 30 mbps.  I tried forcing vr0 to be full-duplex, but the
> connection dropped, I had to reboot the firewall (I wasn't on site).
>
>        It for an uptime of 11h, it currently reads 0/86 in/out errors, and
> 1699614 collisions.  That doesn't soud right.  The number of collisions is
> increasing continuously.
>
> Any suggestions of what to check next would be appreciated.
>
> Thanks,
>
> Ugo
>
>
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