Re: [Xen-users] can't add vlans successfully

["Fajar A. Nugraha" <fajar@xxxxxxxxx>]

On Wed, Aug 12, 2009 at 9:48 AM, Zhang Li<cindy.zhangli@xxxxxxxxx> wrote:
> I am considering the situation:
> If I setup VLANs, for example: domain1, domain2, domain3, domain4.
> domain1,domain2 --> vlan100 , assigning the IP address: 
> 192.168.2.2/192.168.2.3
> domain3,domain4 -->vlan101,  assigning the IP address: 192.168.3.2/192.168.3.3
>
> domain1 can ping domain2 successfully, domain3 and domain4 can ping
> successfully.
>
> In Domain0, br100, br101 ip adress is: 192.168.1.100/192.168.1.101.
> gateway: 192.168.1.1
>

There you go, there's you're source of problem right there: dom1 and
dom2 is on 192.168.2.0/24 but dom0's br100 (which is on the same vlan)
is using 192.168.1.100/24. Is doesn't work that way.

When using bridge (especially with vlans), think of dom0 like a L2 or
L3 switch, and domUs like any other physical network. Get help from
your networking guys if you're not sure. For starters :
- make sure eth0 is connected to a switch, whose port is already
configured as trunk, allowing (at least) vlans 100 and 101
- br100 and br101 needs to be on different subnets (otherwise there's
no point of having a different vlan in the first place), which is
similar to an L3 switch: you have a vlan, and you have an ip address
on that vlan interface.
You could also remove their IP address altogther, which is similar  to
an L2 switch: it knows the vlan, but it doesn't have an Ip address on
that vlan.
- setup dom1 and dom2 to be on the same subnet as other hosts on
vlan100 on your network
- setup dom3 and dom4 to be on the same subnet as other hosts on
vlan101 on your network

Again, don't hesitate to get help from your network guys, cause it's
very similar networking setup with that of a L2/L3 switch.

-- 
Fajar

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