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1 Shocking Trick To Add VLANs To Your Busybox ifupdown Configuration Developers Don’t Want You To Know! Number One Will Disintegrate You!

After scouring the internet for answers on howto use Busybox’s ifupdown binary and configure /etc/network/interfaces to set a vlan for an interface I looked in the ifupdown.c code and there are no references to vlans at all!

Don’t panic! Just because there isn’t built in support for setting the vlans doesn’t mean you can’t use /etc/network/interfaces or have to resort to using some custom cockamamie script to set your vlans up! The answer is in front of your nose!

Lately I’ve been making extensive use of the ifupdown pre-up and post-up options for doing insane things like appending iptables rules, bringing up and down other interfaces, etc… The simple trick is to use pre-up|up to use vconfig to create your vlan. The configuration file’s default location is /etc/network/interfaces

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet manual

auto eth0.192
iface eth0.192 inet static
	pre-up ifconfig eth0 up
	pre-up vconfig add eth0 192

I found that I had to add a second pre-up command to configure eth0 up because it has no configuration. This could be a fundamental misunderstanding on my part however; the configuration works impressively well.

For the ifupdown scripts to work we will need to have a service file be executed on startup to run ifup -a. This will be up to individual project’s requirements however; assuming the project will be using a pure Busybox solution, Busybox provides its own init that will walk through /etc/init.d and run start on the scripts it finds there. Here is an example script that buildroot provided my rootfs skeleton.

# Start the network....

# Debian ifupdown needs the /run/network lock directory
mkdir -p /run/network

case "$1" in
	printf "Starting network: "
	/sbin/ifup -a
	[ $? = 0 ] && echo "OK" || echo "FAIL"
	printf "Stopping network: "
	/sbin/ifdown -a
	[ $? = 0 ] && echo "OK" || echo "FAIL"
	"$0" stop
	"$0" start
	echo "Usage: $0 {start|stop|restart}"
	exit 1

exit $?

Zimbra: Re: [SOLVED] Missing view mail button

I just spent a whole lot of useless time trying to figure out why I no longer had the “view mail” button in the Zimbra Admin Console. There are a tonne of posts about delegated admin access through grants. Certainly perhaps that’s the answer for some or most people. I however couldn’t figure it out. We’re on Zimbra 7.2 and this doesn’t seem to be affecting our Zimbra 8.6 deployment. Both of these deployments have two mailbox servers and a handful of specialized virtual machines running the MTAs and proxies.

My problem turned out to be that depending on which mailbox server you connect to for the Zimbra Admin Console determined whether or not I had the view mail button at all. Specifically if I logged in to mailbox01, the mailbox server I’m on, I will get view mail whereas if I logged in to mailbox02 I’m not given the view mail option. This only occurred because my Omnibox suddenly started preferring mailbox02’s Zimbra Admin Console over mailbox01’s.

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