I've been trying to address ticket 3053 and want to step back and
discuss the requirements for the scripts. The discussion actually
crosses into blfs as well as lfs due to dhcp and bridge issues, but I
want to discuss all of them here at a relatively high level.
Networking starts off with the network script. It basically calls
/sbin/ifup (or ifdown) for each file in /etc/sysconfig/ifconfig.*
The ifup script does:
if not inhibited, 'ip link set ${IFACE} up'
if MTU is requested, 'ip link set dev ${IFACE} mtu $MTU'
for S in ${SERVICE}; do run the script
SERVICE can be ipv4-static, ipv4-static-route, (and in blfs) bridge,
dhclient, or dhcpcd.
Where it gets complicated is in bridge where it is a compound interface
that can contain (an)other interface(s), most likely eth0. The only
reason I introduced the bridge script was to support a virtual computer
such as KVM. I'm not aware of any other common uses for a bridge
interface. (Normally a bridge is used to convert between different
protocols at the link layer, but we use it to connect multiple ethx
interfaces more like a switch than a bridge.)
The host that creates the bridge would normally have a single physical
interface, eth0, and I'd think that would normally be configured with a
static IP address. Virtual hosts then connect to the bridge
dynamically. If a dhcp address is used, then the connections could only
be outgoing unless you rube-goldberg something that dynamically sets up
a dns server.
The question here is whether we need to support automatic setup of a
bridge with an arbitrary number of interfaces, eth0, eth1, ... ethn.
Making the boot scripts handle a bridge with a single ethx interface is
not too bad, but it gets fairly complicated when multiple interfaces are
specified.
My feeling is that we should not try to provide every possible option
like a commercial distro, but instead provide relatively simple and
readable scripts that are usable for the majority of LFS users and let
those few users that want/need something more complex use custom scripts
that address their requirements.
Discussion?
-- Bruce
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