Re: ethernet configuration
On 7/5/08, Florian Kulzer <florian.kulzer+debian@icfo.es> wrote:
> [ Please turn off the HTML part of your messages (I think the Gmail web
> interface calls it something like "rich format") and please stop
> top-posting (I will fix that for this message). ]
>
Sorry.
> On Fri, Jul 04, 2008 at 11:15:05 -0300, André Timpanaro wrote:
> > On Wed, Jul 2, 2008 at 2:01 PM, Florian Kulzer wrote:
> > > On Wed, Jul 02, 2008 at 10:43:58 +0300, Andrei Popescu wrote:
> > > > On Tue, Jul 01, 2008 at 06:04:17PM -0300, André Timpanaro wrote:
> > > > > I've found the /etc/udev/rules.d/z25_persistent-net.rules file:
>
> [...]
>
> > > > I've heard here that some (all?) nVidia chipsets will change MAC on
> > > > every boot. That's your problem.
>
> [...]
>
> > > > You can look in the BIOS for a setting to have a persistent MAC or
> > > > rewrite the rule to allocate device names based only on the kernel
> > > > module (forcedeth?).
> > >
> > > You could try to use a wildcard in z25_persistent-net.rules. This might
> > > work as long as you don't put a second nvidia network card into this
> > > machine:
> > >
> > > # PCI device 0x10de:0x03ef (forcedeth)
> > > SUBSYSTEM=="net", DRIVERS=="?*", ATTRS{address}=="00:00:6c:*", NAME="eth0"
> >
> > I made the change in 'z25_persistent-net.rules' and it stoped creating new
> > interfaces.
>
> OK, so far, so good. At least the proliferation of ethX devices should
> stop now.
>
> > > To make sure that the rest of your network sees a consistent MAC address
> > > for this computer, try to set it explicitly in the eth0 stanza of
> > > /etc/network/interfaces:
> > >
> > > # The primary network interface
> > > allow-hotplug eth0
> > > iface eth0 inet dhcp
> > > hwaddress ether 00:00:6c:e9:01:77
> >
> > But specifying the MAC address didn't worked (he configured the
> > interface correctly but I still couldn't connect to the internet). Probably
> > it wasn't 00:00:6c:e9:01:77 anymore for eth0 (I suspected that would happen
> > but decided to try it anyway).
>
> You can check the IP address with "ifconfig eth0". Does your DHCP server
> base the DHCP leases on MAC addresses?
>
Forgot to mention, it's a static server (I'm setting the ip adresses
on /etc/network/interfaces though).
> > Isn't there a sure way to retrieve the MAC address correctly?
>
> The suggestion above was inspired by this article:
>
> http://www.debian-administration.org/articles/501
>
> I have no idea if it works for all forcedeth-related problems.
>
> > By the way, my BIOS doesn't allow changes in the settings for the net card,
> > so I can't make the MAC address persistent.
>
> According to the comments in forcedeth.c, the problem with retrieving
> the correct MAC is caused by a buggy BIOS, so a BIOS upgrade might help.
>
ok.
> AFAICT, the forcedeth driver does not allow to set a fixed MAC address
> via a module parameter. If you compile your own kernel then you can try
> to change the code that sets the random address
>
> dev->dev_addr[0] = 0x00;
> dev->dev_addr[1] = 0x00;
> dev->dev_addr[2] = 0x6c;
> get_random_bytes(&dev->dev_addr[3], 3);
>
> to this
>
> dev->dev_addr[0] = 0x00;
> dev->dev_addr[1] = 0x00;
> dev->dev_addr[2] = 0x6c;
> dev->dev_addr[3] = 0xe9;
> dev->dev_addr[4] = 0x01;
> dev->dev_addr[5] = 0x77;
>
> I have no way of testing if this actually works. Google finds some
> recent posts on LKML about patches for the MAC detection of forcedeth,
> so you might want to try the newer code (especially if you are
> currently using the version in Etch).
>
> http://lkml.org/lkml/2008/4/8/391
> http://marc.info/?t=119215716900001&r=1&w=2
>
I will take a look at these.
> --
> Regards, | http://users.icfo.es/Florian.Kulzer
> Florian |
>
>
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>
André Timpanaro
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