On 9/12/2013 1:25 PM, Matt Smith wrote:
On Sep 12, 2013, at 10:28 AM, Adam Piasecki <[email protected]> wrote:
First I'm almost certain this is a cable modem/provider problem. We have a 20mb
ethernet circuit that works fine with the same pfSense.
We upgraded to a 100/10mb cable modem, when we put this on the WAN of the
pfsense, we are getting major packet loss during peak times, and speed test
sites that won't even load. Non-peak times we get no packet loss, good speed
tests (50+mb)
The problem I'm having is that when we take the pfSense out and plug a PC
directly into the cable modem, the speedtests look fine and the dropped packets
go away. Both during peak times and non-peak.
My thought is the number of packets going over the cable modem with the pfSense
is a lot greater then just one PC doing a speedtest, and the cable modem can't
handle it. We have about 100 clients behind the pfSense trying to access the
internet during peak times. The traffic graphs on pfSense only indicate we are
doing 5-10mbs download and 1-5 upload, so we are no where near maxing out the
cable modem bandwidth wise.
I've checked wan ethernet settings 1gig full duplex, no collisions or errors on
the pfSense side. I don't see any problems in the log, we are not doing any
traffic shaping.
What's the MTU set to on the WAN interface of the pfsense box? The cable modem may be
encapsulating traffic in PPP or doing some other form of tunneling. You might check
if large packets are being dropped somewhere upstream. You can run ping with a large
packet size and the do not fragment bit set to check this. E.g. 'ping -s 1472 -D
<some_internet_host>'.
-Matt Smith
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Okay, i'll try this, it's 1500 the default.
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