where ifconfig setup/init files?

This is a discussion on where ifconfig setup/init files? within the Linux Programming forums, part of the Platform Specific Boards category; Where can i set the value of MTU of an eth permanently? If i do it with ifconfig then at ...

  1. #1
    Alessio Stella
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    where ifconfig setup/init files?

    Where can i set the value of MTU of an eth permanently? If i do it with ifconfig then at shutdown the set is lost

  2. #2
    Kernel hacker
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    Somehwere in init.d there is a network setup shell-script. Modify that so that it sets the correct MTU. [It may call some other script which may be what you want to modify - but the principle is that the network start is done via a shell-script somewhere init.d].

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  3. #3
    Cat without Hat CornedBee's Avatar
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    And that init.d script will be configurable using some configuration file.

    For example:
    - Gentoo's /etc/init.d/net.* scripts are configured by /etc/conf.d/net and /etc/conf.d/wireless.
    - ArchLinux's /etc/rc.d/network script is configured by /etc/rc.conf.
    All the buzzt!
    CornedBee

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  4. #4
    Alessio Stella
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    Quote Originally Posted by CornedBee View Post
    And that init.d script will be configurable using some configuration file.

    For example:
    - Gentoo's /etc/init.d/net.* scripts are configured by /etc/conf.d/net and /etc/conf.d/wireless.
    - ArchLinux's /etc/rc.d/network script is configured by /etc/rc.conf.
    Thank you I have Debian and I have to wait till Tuesday for a colleague expert to these things
    This is what I dislike of Linux
    How can one find out which file to edit and how to edit it
    "man ifconfig" points at 3 empty files
    /proc/net/socket
    /proc/net/dev
    /proc/net/if_inet6

  5. #5
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    Files in /proc are not real files. Those are interfaces to the OS to supply information out of the OS without adding new API functions - instead, the OS pretends to have files in the /proc tree which provides text information to the applications that want it.

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    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

  6. #6
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    Yes, like Mats says, don't edit the files in /proc, rather, /etc is where your configuration files are.

  7. #7
    Frequently Quite Prolix dwks's Avatar
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    Good reading: http://www.debian.org/doc/manuals/re...ateway.en.html

    Maybe you want this.
    10.8.1 Triggering network configuration at boot time
    On boot the /etc/rcS.d/S40networking init script runs the command ifup -a. This brings up all physical interfaces listed in auto stanzas in /etc/network/interfaces.

    These days it is often better to handle network configuration using dynamic methods. Once mechanisms for supporting dynamically changing hardware are in place it becomes simplest to treat static hardware as if it were dynamic too. Booting can then be treated as just another hotplug event. (See Triggering network configuration – hotplug, Section 10.8.2.)

    However, in almost all cases one wants at least the loopback interface lo to be brought up on boot. Therefore, make sure that /etc/network/interfaces includes the following stanzas.

    auto lo

    iface lo inet loopback
    You can list additional physical interface names in auto stanzas if you want them to be brought up on boot too. Never list PCMCIA interfaces in auto stanzas. The PCMCIA cardmgr is started later in the boot sequence than when /etc/rcS.d/S40networking runs.
    dwk

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