Subject: Re: "dribbling bit"
To: Michael Richardson <firstname.lastname@example.org>
From: None <email@example.com>
Date: 01/20/2003 14:27:16
Based on the device name, I believe you may be using a NIC with the RealTek
chipset. I have seen many different bizarre errors with these NICs, in Netbsd
as well as other operating systems.
This is easy to verify or refute; stick a different NIC in the box and see if
the problem goes away.
I ultimately removed all RealTek based NICs from my firewalls and the problems
immediately and permanently disappeard.
"Non-integer number of bytes" doesn't make sense. There is no such thing as a
fraction of a byte. I think they mean that there are framing errors and the
stream is interpreted as having bits that are not part of a byte. In any event
it must be a framing error; to really see why requires a storage scope or an
old style network analyzer that shows you the serial bit stream.
On 20-Jan-2003 Michael Richardson wrote:
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>>>>>> "Michael" == Michael Richardson <firstname.lastname@example.org> writes:
> Michael> My firewall has started to do:
> Michael> Jan 20 10:35:20 bud /netbsd: tlp0: receive error: dribbling bit
> Michael> Jan 20 10:35:20 bud /netbsd: tlp0: receive error: CRC error
> Michael> Jan 20 10:35:22 bud /netbsd: tlp0: receive error: dribbling bit
> Michael> Jan 20 10:35:22 bud /netbsd: tlp0: receive error: CRC error
> Michael> This interface is plugged directly into a GVC ADSL modem doing
> Michael> bridged ethernet.
> Michael> A couple of other interfaces did this for awhile, and the switch
> died or
> Michael> needed to be reset soon afterwards. The GVC ADSL modem has been
> power cycled
> Michael> already. (As has the firewall)
> Michael> Can anyone say what this means? Clearly, there is corruption,
> which the CRC
> Michael> is in fact catching, but any deeper hit on the dribbling bit?
> This is a
> Michael> D-LINK 4-port card in a Dell Optiplex (thus the two PCI
> Michael> bridges):
> Okay, found the datasheet... dribbling bit means that I'm getting
> non-integer number of bytes. Cables do not usually go bad suddendly. I wonder
> if something else moved too close. Any advice welcome.
> ] ON HUMILITY: to err is human. To moo, bovine. | firewalls
> ] Michael Richardson, Sandelman Software Works, Ottawa, ON |net
> ] email@example.com http://www.sandelman.ottawa.on.ca/ |device
> ] panic("Just another Debian GNU/Linux using, kernel hacking, security guy");
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M. I. S. Corp.
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