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August 2011

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Subject:
Kernel 2.6.32 and atl1c driver
From:
William Scott <[log in to unmask]>
Reply To:
William Scott <[log in to unmask]>
Date:
Mon, 15 Aug 2011 15:10:35 +1000
Content-Type:
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I recently did a http install of SL6.1 as a virtualisation host.

One of the network interfaces is a Atheros Communications AR8131
Gigabit Ethernet (rev c0) using the ATL1C driver.

One of the host machines (under KVM) has a https web interface
(Vyatta). Attempting to reach this interface via the above bridged
interface resulted in a corrupted page. Wireshark indicated that there
was multiple “Broken TCP” packets.

A web search revealed that the atl1c driver had/has issues with kernel 2.6.32.

Did a pci/device ID check at Elrepo which reported that the atl1e
driver was usable.

Quick install with …
yum install http://elrepo.org/linux/elrepo/el6/x86_64/RPMS/kmod-atl1e-1.0.1.14-1.el6.elrepo.x86_64.rpm

Blacklisted the atl1c driver…
vi /etc/modprobe.d/blacklist-net.conf
blacklist atl1c

Followed by a reboot.

Https page now loads correctly and no broken TCP messages in
Wireshark. Also got rid of some ssh issues (garbled decryption).

Just a FYI post and to say thanks to Elrepo.

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