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====== PCMCIA networking ======

On a **Debian GNU/Linux Etch** system the PCMCIA network is bringed up **after the boot process**, later than Ethernet interfaces. However the configuration of interface and network services (NFS mounts, etc.) are controlled by the ''**/etc/network/interfaces**'' file.

It is no longer needed to configure PCMCIA networking within ''**/etc/pcmcia/network.opts**'', everything is controlled by ''**/etc/network/interfaces**''. To activate this new approach, we have into ''**/etc/default/pcmcia**'':

<code>
REFRAIN_FROM_IFUP=yes
</code>

You must make sure that the PCMCIA network interface is **not listed** in any ''**auto**'' line in ''/etc/network/interfaces''. To get advantage of the PCMCIA //scheme// mechanism (used to change network configuration on the fly using ''**cardctl scheme**'' command) you can set up a ''/etc/network/interfaces'' like this:

<code>
#---------------------------------------------------------------------
# The hotplug subsystem does an "ifup eth0=hotplug" when a PCMCIA
# network card is detected. This mapping script will return the
# name "eth0-<pcmcia_scheme>" so that the proper
# "ifup eth0-<pcmcia_scheme>" will be executed.
#---------------------------------------------------------------------
allow-hotplug eth0
mapping hotplug
        script /usr/local/sbin/map-scheme

iface eth0-dhcp inet dhcp

iface eth0-home inet static
        address 192.168.2.5
        netmask 255.255.255.0
        gateway 192.168.2.2
</code>

When the **hotplug** subsystem detects a PCMCIA network card, it executes an ''**ifup eth0=hotplug**'', the //mapping// stanza above will convert it into an ''**ifup eth0-//pcmcia_scheme//**''. So the configuration from ''**iface eth0-//pcmcia_scheme// inet ...**'' stanza will be used.

The script ''**/usr/local/sbin/map-scheme**'' is the following:

<code bash>
#! /bin/sh
# Recevies the name of a network interface as the 1st parameter.
# It returns on stdout the string <ifname>-<pcmcia_scheme>.
# It is used to map the real interface name to the appropriate
# configuration stanza into /etc/network/interfaces.
iface="$1"
if [ "$iface" = "" ]; then iface="eth0"; fi
scheme="$(cat /var/lib/misc/pcmcia-scheme 2> /dev/null)"
if [ -n "$scheme" ]; then
    echo $iface-$scheme
else
    echo $iface
fi
exit 0
</code>