LinuxQuestions.org - Entries for April 2012

BIOS still not smart enough

Posted 04-30-2012 at 01:45 PM by Skaperen

BIOS is still not smart enough, and has failed to reach the "holy grail" of doing just what system administrators want it to do. This means you AMI. And the others, too.

What I (and just about every system administrator I've talk to about this) want is to be able to specify a device boot order that does NOT get modified by the BIOS just because the media or device is absent in a future boot cycle. I want to have the USB memory stick be the FIRST boot device, conditional...

Skaperen

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Why is netfilter in kernel space?

Posted 04-21-2012 at 03:11 PM by Skaperen

Isn't one of the kernel design intentions to move more things to user space and keep the kernel itself smaller? I think network filtering should be one of those things.

So why haven't they done that? Is it considered too much of a performance issue to use user processes filter packets? I don't think it would be. But maybe there is some functionality missing that can be done in the kernel and not in user space?

The API would not be hard. Just create device nodes...

Skaperen

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Rethinking network configuration

Posted 04-15-2012 at 02:43 AM by Skaperen

Previously I wrote about configuring interfaces with static IPs based on matching them with what actual network (subnet) the interface is connected to. Now I'm thinking about it in even more different terms. But this concept will need some changes in the kernel itself.

To start with, the kernel already (by default) will "leak" an IP address to other interfaces. Specifically, if an ARP query comes in on one interface for an IP address only configured on another interface,...

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Browsers still re-fetch pages when using back button

Posted 04-11-2012 at 11:42 AM by Skaperen

Browsers these days are still trying to re-fetch data when I press the infamous "back button". I think this was always a dumb idea.

No doubt that is the cause for many cases of web site double ordering. Someone backs up so they can print out the results of a previous page where they committed their order, and it causes the data to POST again, which places another order. Now days, for POST, you get a pop-up that says the browser needs to re-post the data.

...

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Static network config not based on interface name or MAC address

Posted 04-08-2012 at 04:57 PM by Skaperen

Traditionally, static configurations of IP addresses were made based on the interface names, which were always constant. When the kernel started doing device probes in a way that interface names would vary from time to time even on the exact same set of NICs, then we needed udev to keep things orderly. Turns out even udev can be fool when you change NICs, or when moving system hard drives to a new machine. New MAC addresses mean the old interface names are unavailable. So network configurations...

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