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On Tue, 31 Dec 2002 13:25, Anderson Lizardo wrote:
> > Give this one a try. It isn't against 2.4.20, but I haven't changed
> > things in
> > a long time. Please let me know what happens - success or failure,
> > and logs.
>
> Sorry about the late response.
>
> Until now... success. :). If I have some problem this week, I send an
> email. Logs are attached. Now, some "considerations":
That is good news. I will submit this in the next couple of days.

> 1) I'm using the option "ifconfig eth1 allmulti", just as a test. By
> the way, this option increase or fix something related with the Cable
> Modem? Or It isn't related with this? My inspiration to do this (from
> the log):
>
> CDCEther.c: eth1: too many MC filters for hardware, using allmulti
Your cable modem probably (actually, almost certainly) doesn't support
multicast filtering. Its a debug message, and will be turned off when this
driver is no longer considered experimental.

> 2) All these messages that appear when I plug my Cable Modem, about
> "imperfect filtering" or "Can't use SetEthernetMulticastFilters
> request", it's some problem, or just warnings, or features not
> implemented?
Features not implemented in your modem. Does it help to know that the driver
is for a class of products, of which some cable modems just happen to fit?

Dec 29 16:32:15 anderson kernel: CDCEther.c: Ethernet information found at device 
configuration.  Trying to use it anyway.
This is a design fault in your modem. The device descriptors are incorrect,
but the CDCEther driver works around this.

Dec 29 16:32:15 anderson kernel: CDCEther.c: Found Header descriptor, CDC version 110.
Dec 29 16:32:15 anderson kernel: CDCEther.c: Imperfect filtering support - need sw 
hashing
This means that the multicast filter cannot perrform "perfect filtering", which
means that some multicast packets will be sent through to the device that
do not match the multicast groups that your machine is a member of.
Note that a cable modem doesn't need multicast - it is running point-to-point.

Dec 29 16:32:15 anderson kernel: CDCEther.c: Can't use SetEthernetMulticastFilters 
request
Your modem says that it doesn't support a particular command, which 
is optional according to the specification.

Dec 29 16:32:15 anderson kernel: CDCEther.c: detected BULK OUT packets of size 64
This is how big the data packets from host to modem can be.

Dec 29 16:32:15 anderson kernel: CDCEther.c: interrupt address: 5
This is actually bogus on your device. No interrupts get delivered.

Dec 29 16:32:15 anderson kernel: CDCEther.c: interrupt interval: 64
So is this.

Dec 29 16:32:15 anderson kernel: CDCEther.c: eth1: Thomson Consumer Electronics 
Thomson DCM245 Cable Modem 001095A4A496
This is who claims to make your modem, and its serial number.

Dec 29 16:32:15 anderson kernel: CDCEther.c: eth1: 00:10:95:A4:A4:96
This is the MAC address. Usually the same as the serial number.

Dec 29 16:33:07 anderson kernel: CDCEther.c: eth1: set multicast filters
This means that the networking stack has called a particular member
function...

Dec 29 16:33:07 anderson kernel: CDCEther.c: eth1: too many MC filters for hardware, 
using allmulti
But we can't implement multicast because of device limits.

> I'm not finding much information about CDCEther module (like in Kernel
> documentation). I think that's because of this that I have so many
> questions...
Most modules don't have much documentation. I guess I should write up a brief
explaination though, since these questions keep coming up. Generally you
are expected to read the source code if you want to know how
it works.

Brad
- -- 
http://linux.conf.au. 22-25Jan2003. Perth, Aust. I'm registered. Are you?
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