I don't know much about the working of vlans either. I simply use them
:-)
Looking at the ifupdown mechanism it seems to work like this:
You just configure the vlan in /etc/network/interfaces like: iface
eth0.1 inet dhcp
When you then enter 'ifup eth0.1', the system configures eth0 and then
sets on top the virtual interface eth0.1 Afterwards it starts the
dhclient on the virtual interface. So, the end configuration of an "ifup
eth0.1" looks like this (sorry, from German system):
eth0 Link encap:Ethernet Hardware Adresse 00:1f:16:0d:7b:41
inet6-Adresse: fe80::21f:16ff:fe0d:7b41/64
Gültigkeitsbereich:Verbindung
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metrik:1
RX packets:1468333 errors:0 dropped:0 overruns:0 frame:0
TX packets:1453849 errors:0 dropped:0 overruns:0 carrier:0
Kollisionen:0 Sendewarteschlangenlänge:1000
RX-Bytes:919300549 (919.3 MB) TX-Bytes:629072382 (629.0 MB)
Interrupt:20 Speicher:f2700000-f2720000
eth0.1 Link encap:Ethernet Hardware Adresse 00:1f:16:0d:7b:41
inet Adresse:172.17.2.103 Bcast:172.17.2.127 Maske:255.255.255.128
inet6-Adresse: fe80::21f:16ff:fe0d:7b41/64
Gültigkeitsbereich:Verbindung
UP BROADCAST RUNNING MULTICAST MTU:1500 Metrik:1
RX packets:292825 errors:0 dropped:0 overruns:0 frame:0
TX packets:190175 errors:0 dropped:0 overruns:0 carrier:0
Kollisionen:0 Sendewarteschlangenlänge:0
RX-Bytes:342938624 (342.9 MB) TX-Bytes:29941003 (29.9 MB)
So, the parent device eth0 is up but has no IP address. The virtual
device eth0.1 has an IP address. Same applies to the routes:
Ziel Router Genmask Flags Metric Ref Use Iface
default pbx.home 0.0.0.0 UG 100 0 0 eth0.1
link-local * 255.255.0.0 U 1000 0 0 eth0.1
(not sure what the link-local is good for)
Network Manager on the other hand does not do anything with eth0.1. It
just configures eth0 and start the dhclient on eth0, although it reads
its configuration from the same /etc/network/interfaces file. So, either
it doesn't know how to handle vlans at all or it does not read
/etc/network/interfaces correctly. But 0.9.4 is said to have vlan
support.
Would it be better to go upstream with this question? However, those
guys there deal with a different configuration system from rhel. They
might not understand the Ubuntu implementation...
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https://bugs.launchpad.net/bugs/1029273
Title:
NetworkManager tries to configure eth0 instead of eth0.1
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