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Old 11-23-2014, 02:06 PM   #1
LQ Newbie
Registered: Apr 2014
Posts: 24

Rep: Reputation: Disabled
Advanced network configuration systems.

I've got several rather complex network setups that I'd like to put in a configuration file. Currently, I'm using Debian's ifupdown configuration, but that seems to have some minor problems especially when using ipv4 and ipv6 (complaints that an interface is already up or doesn't exist when going down). I'm thinking about just using a makefile-based setup for my needs but would be happy to know if there are any better management systems that also give a good bit of manual control when needed.

My planned setup looks like this

 VM  VM (vbox)
  \ /
eth0vde   eth0    veth -- VM (lxc)
   \       |      /
    \      |     /--veth -- VM (lxc)
     \     |    /
      \    |   /
       \   |  /
         / | \
        /  |  \
   eth0.2  |   \--eth0.99
eth0vde is a VDE2 switch TAP. eth0br bridges this as well as eth0, and also allows linux containers to join the bridge (,

I have similar bridges to allow for host-only (and inter-host between several different computers) connections, as well as a NAT based bridge. The bridges also use new features such as VLAN filtering available in the 3.15 kernel.

I've thought about just using a makefile-based approach such as:

.PHONY: start-eth0cluster
start-eth0cluster: stop-eth0cluster
	ip link add dev eth0br type bridge
	vde_switch -s /var/run/vde2_eth0vde.ctl -t eth0vde
	ip link set dev eth0 master eth0br
	ip link set dev eth0vde master eth0br
	ip link set dev eth0br up
	ip link set dev eth0 up
	ip link set dev eth0vde up

.PHONY: stop-eth0cluster
	ip link set dev eth0br down
	ip link set dev eth0 down
	ip link set dev eth0vde down
	ip link set dev eth0 nomaster
	ip link set dev eth0vde nomaster
	ip link delete dev eth0br
	kill `cat /var/run/`
While this gives me absolute control, I'm wondering if other management solutions that give just as much control exist. (ifupdown is nice but doens't have any way of specifying that one interface depends on another it seems)
Old 11-23-2014, 03:17 PM   #2
LQ Newbie
Registered: Apr 2014
Posts: 24

Original Poster
Rep: Reputation: Disabled
Another issue I'm wondering about is how to do a setup when two interfaces depend on each other. In the situation above, eth0 and eth0br depend on each other, and eth0vde and eth0br depend on each other.

Eth0 depends on eth0br being up and being master of eth0 in order to add vlans via 'bridge vlan add' Similar case is with eth0vde. If I use /etc/network/interfaces and "bridge_ports eth0 eth0vde" and bring the bridge up first, eth0vde doesn't exist yet. But if I bring eth0vde up first, then the bridge doesn't exist for eth0vde post-up rules to add vlans: "post-up bridge vlan add ..."


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