Mapping stanzas in interfaces file not working

From: Chris Eisley (chris_at_cepheus.net)
Date: 02/03/04

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    To: Debian User Mailing List <debian-user@lists.debian.org>
Date: Tue, 03 Feb 2004 01:42:30 -0800

    Hello,

    I'm trying to switch over from commenting/uncommenting relevant iface
    stanzas (man pages call them stanzas, so no snipes about my lack of
    understanding of the word) in /etc/network/interfaces to using the
    mapping mechanism described in the interfaces man pages.

    The problem is that when I put the mapping entry in, ifup gives the
    error "Ignoring unknown interface eth0=eth0." The script I designate in
    the script line of the mapping stanza is never being executed and of
    course the eth0 interface isn't being configured.

    Here's what I'm trying. The iface lines you see below all work
    perfectly when they use physical interface names instead of logical ones
    (ie eth0 instead of eth0-whatever); in the past I was simply
    uncommenting the one I wanted to use at the time.

    # Logical mappings for Ethernet card
    mapping eth0
            script /etc/network/show-role.sh -q -l
            map INTERNAL-WAP eth0-internal-wap
            map INTERNAL-CEPHEUS eth0-internal-cepheus
            map EXTERNAL eth0-external
            map DHCP eth0-dhcp

    I then have corresponding iface entries with logical interface names:

    # Ethernet card acting as external interface on 192.168.1/24 net
    iface eth0-external inet static
            pre-up /etc/rc.firewall
            down /etc/rc.firewall
            dns-nameservers 172.16.0.1
            dns-search cepheus.net
            address 192.168.1.2
            gateway 192.168.1.1
            network 192.168.1.0
            broadcast 192.168.1.255
            netmask 255.255.255.0
            name Ethernet LAN (External Interface)

    # Ethernet card acting as internal interface on 192.168.2/24 net
    iface eth0-internal-cepheus inet static
            address 192.168.2.1
            network 192.168.2.0
            broadcast 192.168.2.255
            name Ethernet LAN (Internal/Cepheus Interface)

    # Ethernet card acting as internal interface on 192.168.2/24 net
    iface eth0-internal-wap inet static
            address 192.168.1.2
            network 192.168.1.0
            broadcast 192.168.1.255
            name Ethernet LAN (Internal/WAP Interface) 

    -- 
Chris Eisley <chris@cepheus.net>
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