Capture problems with Intel quad cards?

Murphy, Jay, DOH Jay.Murphy at
Mon Feb 16 22:17:07 UTC 2009

One more note.... it is a bridging chip, not switching, that is resident
on the board that is the communicator to the other NIC chipsets.

Jay Murphy 
IP Network Specialist 
NM Department of Health 
ITSD - IP Network Operations 
Santa Fe, New Mexico 87502 
Bus. Ph.: 505.827.2851

"We move the information that moves your world." 

-----Original Message-----
From: Mr. James W. Laferriere [mailto:babydr at] 
Sent: Monday, February 16, 2009 11:39 AM
To: John A. Kilpatrick
Cc: nanog at
Subject: Re: Capture problems with Intel quad cards?

 	Hello John ,

On Sun, 15 Feb 2009, John A. Kilpatrick wrote:
> Has anyone had problems with using current Intel quad ethernet cards
> packet capture?  As a proof-of-concept test we bought an Intel
PWLA8494GT and 
> hooked it up to some Network Critical taps.  There was a very strange
> with corruption of the captured packets.  The *only* issue (but it's a
> one) is that the source IP on some captured packets is munged.  As far
as I 
> can tell that's the *only* issue with the packet captures - no other
data is 
> corrupted.
> Oh, and to rule out other issues:
> 1.  Corruption seen both when using network taps and when using a port
> span/mirror (so it's not the taps).
> 2.  Corruption *not* seen using the on-board broadcom nics of the test
> host (so it's not the box).
> So I'm pretty sure we narrowed it down to the card.  We tried the card
> an indentical host and saw the same problems.
> I thought it might be a driver issue - I tried both gentoo and FreeBSD
> sure how different the drivers are) just to see if it mattered at all
and it 
> didn't.  Much googling didn't show this to be a known issue - just
> if anyone else has seen it?  Other recommendations welcome - the next
> is, I suppose, a broadcom-based PCI-X card.  (I've got some old pizza
> I'm trying to repurpose as network probes.)
> Thanks,
> John
 	Does this device provide 4 unique mac-addresses ?  Reason for
question is some old(I mean old) multiport cards presented a single
because the were driven by a single 'Switch chip' .  Just a thought .
I've been 
looking a the Intel site gandering over the overview & have not seen
anything to 
relieve my concern .  But one Hopes they have learned not to create
such a problem .

 		Hth ,  JimL
| James   W.   Laferriere | System    Techniques | Give me VMS     |
| Network&System Engineer | 2133    McCullam Ave |  Give me Linux  |
| babydr at | Fairbanks, AK. 99701 |   only  on  AXP |

This inbound email has been scanned by the MessageLabs Email Security

Confidentiality Notice: This e-mail, including all attachments is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited unless specifically provided under the New Mexico Inspection of Public Records Act. If you are not the intended recipient, please contact the sender and destroy all copies of this message. -- This email has been scanned by the Sybari - Antigen Email System. 

More information about the NANOG mailing list