Hi,
I've upgraded the kernel on my debian/testing box at home from 2.6.18
to 2.6.21, and my internet connection stopped working - dns, ping
work, imap, pop and www clients manage to connect but always timeout
when waiting for remote data.
The connection setup: a pptp tunnel (ppp0) over a usb connected (cdc_ether)
cable modem (eth1 - Thomson DCM245).
ifconfig shows rx errors on eth1 when accessing web sites. MTU on eth1
is set to 576 (default - presumably hardware limit), and ppp0 to
1500 (default).
Web access is restored (yet is ~40% slower) when setting MTU to 512 on
ppp0.
I've followed through with a git bisect and managed to home in on the
following commit as the first bad one:
a99c19492a801013fd25ce7bab1f0f65a328a4ba is first bad commit
commit a99c19492a801013fd25ce7bab1f0f65a328a4ba
Author: Jamie Painter <[EMAIL PROTECTED]>
Date: Thu Jul 27 14:17:28 2006 -0400
USB: usbnet - Add unlink_rx_urbs() call to allow for Jumbo Frames
Add usbnet_unlink_rx_urbs() which can be called by mini-drivers when
they change their MTU such as for Jumbo Frame support.
Signed-off-by: David Hollis <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
:040000 040000 4248c6b610ebe61233e08bf6e2051c733c69245d
28b8a35b3b280711e12183a17a312c4db17c7002 M drivers
While this does seem to be related to the symptoms I've listed above,
I'm not quite sure what to make of it. Why does this break my internet
connection (surely an MTU of 576 hardly qualifies for the title
Jumbo... )? Is it a kernel bug or is my setup triggering this problem?
I'd appreciate any help to debug and fix this.
I'll post any info you think is relevant.
Thanks,
Avi.
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