Flapping WAN with axe interface

[Carsten Sonne Larsen]

I used to run a setup with a D-Link DUB-E100 ver. B adapter on pfSense also
using it for a DCHP WAN connection. I had a similar issues. Every time I 
unplugged
the DUB-E100 things would work smoothly again.

Now Im using the D-Link adapter on a 8.3-RELEASE and am still having 
issues once
in a while. Im not a hardware guy but I think the D-Link simply just 
have a buggy
hardware or somehow have some hardware restriction preventing it to be 
used as
nothing else but an extra NIC in a laptop - I remember one of the issues 
was the
NIC not being able to allocate buffer space.

/carsten

On 06/22/2013 03:11, Adam Hunt wrote:
> I just replaced my old WRT54GS running DD-WRT at home with a proper pfSense
> firewall. The only real problem I've had is my WAN link to Comcast goes
> down at least every twelve hours. I used to think it was almost exactly
> every twelve hours (leading me to think Comcast's DHCP server hated me) but
> I have since noticed that the WAN flaps at less predictable intervals. I
> can't figure out if it's related to DHCP or not. I can say that nothing out
> of the ordinary was going on on my network when this happens. It happens
> whether or not anyone is actively using any of the systems on the network.
> It can happen when I'm working, browsing, and streaming Netflix or it can
> happen everyone in the house is asleep and most everything is down or idle.
>
> One thing that I have learned since I starting this adventure is that it's
> in some way related to my D-Link DUB-E100 rev B1 USB NIC. I know that USB
> isn't the preferred interface for networking but it's what I had. I'm
> currently using a 3.4 GHz P4 Prescott Dell OptiPlex GX620 "ultra small form
> factor" desktop for my firewall and it doesn't have any PCI/PCIe expansion
> so I'm left with USB. For some reason I had a D-Link DUB-E100 ver. B
> (AX88772) adapter laying in a box, since it was on the 8.3 HCL I decided to
> give it a try.
>
> Below you'll find the my system, dhcp, and gateway logs for the time that
> the link goes down. If you need any other logs or other information I'll be
> more than happy to provide it.
>
> system.log:http://pastebin.com/mxuXd55w
> dhcp.log:http://pastebin.com/tvAihELQ
> gateways.log:http://pastebin.com/2cZqjJBa
>
>
> So, after watching the logs, thinking, talking on IRC, checking with the
> pfSense forums I decided to perform a simple experiment. I swapped the
> interfaces, I connected my DOCSIS bridge to the bge0 onboard interface, and
> hung my LAN off the USB NIC. Ever since swapping the interfaces everything
> has been quiet. I haven't seen a single error in any of my logs.
>
> What are your thoughts? Is is a Comcast issue, an issue with the DOCSIS
> bridge, an axe bug, a USB bug, some combination of issues, or something
> different entirely? I realize I could just leave everything as is but I'd
> like to help solve this little mystery. Also, years ago I was taught it's
> bad form not to report potential bugs.
>
> Thanks for your help.
>
> --adam
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