Mailinglist Archive: opensuse (4634 mails)

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Re: [opensuse] unable to access website after 10.2 install [CLUE!]
  • From: Randall R Schulz <rschulz@xxxxxxxxx>
  • Date: Tue, 19 Dec 2006 09:11:46 -0800
  • Message-id: <200612190911.46201.rschulz@xxxxxxxxx>
Hi,

On Tuesday 19 December 2006 07:50, Randall R Schulz wrote:
> Chip,
>
> ...
>
> With all that, only the 10.2 box cannot access
> <http://www.marymount.edu/>!

I should have made some note of my hardware:

ASUS P5B Deluxe
Core 2 Duo
32-bit Linux install

% /sbin/lspci | grep -i ether
02:00.0 Ethernet controller: Marvell Technology Group Ltd. Unknown device 4364 (rev 12)
05:04.0 Ethernet controller: Marvell Technology Group Ltd. 88E8001 Gigabit Ethernet Controller (rev 14)

So it's not Intel Ethernet NIC that's an issue, it would seem.


So I started up Wireshark (nee Ethereal) and tried to spot any problems,
and my first hunch, as improbable as it seems, was borne out: A bad
checksum!!

According to Wireshark, the IP packet that was synthesized to convey the
HTTP "GET / HTTP/1.0" message had a bad checksum:

Checksum: 0x15a8 [incorrect, should be 0xa4bb (maybe caused by checksum offloading?)]


Funky, eh?

Since this symptom is occurring on different NICs (and different
hardware vendor's NICs), the "checksum offloading?" hypothesis doesn't
seem right.

In fact, the person who pointed the finger at the 10.2 TCP/IP stack as
the culprit appears to have been on the right track.


Randall Schulz
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