Is possible configure virtual Lan, using the standard IEE 802.1Q,
on Ultra 450???
Do we need un additional NIC ??
Can anyone help me ?
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I'm trying to understand the 802.1q vlan working. I tried to setup a
little lab environment but I cant get the thing started.
I have to laptops, both running Debian. I have a Cisco catalyst switch.
First on the Cisco I do the following:
Interface fastethernet 0/7
Switchport trunk encapsulation dot1q
Switchport trunk allowed vlan 666
Switchport mode trunk
The same for fastethernet 0/8
Then on the linux boxes:
ifconfig eth0 down
ifconfig eth0 0.0.0.0 up
vconfig add eth0 666
ifconfig eth0.666 192.168.1.1 netmask 255.255.255.0 broadcast
And on the other box I do the same except I use 192.168.1.2 in stead of
Then the big test ping 192.168.1.2 from the 192.168.1.1 machine and
..... nope, nothing happens.
While looking at this issue I used ethereal to see what is actually going
over the line. And from the two debian boxes I miss the 802.1q headers in
the TCP package. In the documentation and when I look at the traffic from
a Cisco IP-phone I see that they are sending some VLAN information into 4
bytes but my linux boxes dont do that.
What is wrong?
The switch is a clean installation, just default only the things changed I
mentioned above. The network itself without Vlan is working. Rebooted
everything at least a dozen time till now.
12. 802.1q & Linux
13. IEEE 802.1Q