mroth at imminc
Jan 18, 2007, 2:15 PM
Post #1 of 1
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A solution to the scrambled packets problem
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List members,
I recently ran into the scrambled packets problem that Paul Williams
reported. At the time, my system spec was as follows:
Manufacturer: Dell Inc.
Product Name: PowerEdge 2950
Processor: 1 Intel Xeon 5160 @ 3.00GHz (Dual Core)
Memory: 4 GB
Network Card: Intel Corporation 82571EB Gigabit Ethernet Controller
Linux Distribution: Fedora Core 5 x86_64
Kernel Version: 2.6.18-1.2257.fc5
libpcap Version: 0.9.4
I tried various versions of PF_RING to no avail. Packets were being
captured, but their data was scrambled. After reviewing this list, I
noticed that the 2.6.18 kernel seemed to be a common theme. Today I
rolled back to a 2.6.17 kernel and rebuilt PF_RING from the current CVS,
and things are working fine again.
This is Fedora specific, but the source RPM I used is available at:
ftp://ftp.pbone.net/mirror/download.fedora.redhat.com/pub/fedora/linux/core/updates/5/SRPMS/kernel-2.6.17-1.2187_FC5.src.rpm
I don't know if the problem was related to changes in the vanilla 2.6.18
kernel or Fedora's patches, but if you are running Fedora or one of its
siblings I recommend trying a 2.6.17 kernel as your first
troubleshooting step. If you absolutely must run a 2.6.18 kernel, try a
vanilla one from kernel.org. The build process is slightly easier than
the Fedora way, but I can provide help if you need it.
Please respond to this post with any feedback.
Thank you,
Matthew Roth
InterMedia Marketing Solutions
Software Engineer and Systems Developer
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