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Old 03-30-2009, 12:47 AM   #1
ashan
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Registered: Apr 2007
Distribution: redhat, ubuntu
Posts: 8

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VLAN trunk and loop


Hi, guys,

I am doing this to connect my home computer network to a VLANed network.

Code:
         eth0 |-------------| eth1         |---------|
ACC    =======| LinuxBox    |==============| Switch  |========PCs
              |_____________|              |_________|

I have the LINUX box with port eth0 and eth1. The setup is like follow:

1, eth0 connected to a network with three vlan: VID 1011, 1012, 1013
2, the eth1 is connected to my home network's switch-a soho switch without VLAN support

I'm tring to use the LinuxBox as a bridge to unTAG the VLAN thing, so I can use my pc to access the ACC network. I did the following but seems cause loop in the ACC end, any ideas?

Thanks,

-----------------------------------------------------------
#!/bin/sh

#eth0 and eth1 is in the bridge already
ifconfig br0 0.0.0.0
ifconfig eth0 192.168.2.10
brctl delif br0 eth0

# VLAN 1011
vconfig add eth0 1011
brctl addif br0 eth0.1011
ifconfig eth0.1011 0.0.0.0

#VLAN 1012
vconfig add eth0 1012
brctl addif br0 eth0.1012
ifconfig eth0.1012 0.0.0.0

#VLAN 1013
vconfig add eth0 1013
brctl addif br0 eth0.1013
ifconfig eth0.1013 0.0.0.0

# here we prevent 1013 data to be sent on the 1012 internet VLAN
ebtables -A FORWARD -i plc0.1013 -o plc0.1012 -j DROP

Last edited by acid_kewpie; 03-30-2009 at 05:23 AM.
 
Old 03-30-2009, 05:26 AM   #2
acid_kewpie
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How / why are you bridging multiple vlan's? Either this doesn't make any sense or your network is hideously deformed and should be put out of its misery.
 
Old 03-31-2009, 12:45 AM   #3
ashan
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Registered: Apr 2007
Distribution: redhat, ubuntu
Posts: 8

Original Poster
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Hi,

The VLAN thing coming from our data centre, there is not much we can do to change it. At the work location, we have one CAT5 cable in which is connected to eth0 of one of the computer. Other computers need to talk to all these three VLANs, so comes the posted diagram. That is: the linux box is used for attaching or removeing the tag to enable the access.

Thanks
 
Old 03-31-2009, 03:15 AM   #4
acid_kewpie
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So these 3 vlans are the same subnet?? are you sure you shouldn't be routing???

And anyway, *if* you're causing a loop, then clearly they *ARE* connected already on L2 somewhere, so you only want one of them in the first place.

Last edited by acid_kewpie; 03-31-2009 at 03:27 AM.
 
  


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