[ovs-dev] [PATCH] FAQ: Add Q&A to reiterate that VLANs partition a network.

Ben Pfaff blp at nicira.com
Thu Nov 29 16:46:23 UTC 2012


A few users don't seem to understand this.

Signed-off-by: Ben Pfaff <blp at nicira.com>
---
 FAQ |   12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/FAQ b/FAQ
index 75eab99..154c621 100644
--- a/FAQ
+++ b/FAQ
@@ -569,6 +569,18 @@ A: It's possible that you have the VLAN configured on your physical
          equally well.  Refer to the documentation for the Port table
          in ovs-vswitchd.conf.db(5) for more information.
 
+Q: I added a VM to a bridge as an access port for a VLAN, like this:
+
+       ovs-vsctl add-br br0
+       ovs-vsctl add-port br0 eth0
+       ovs-vsctl add-port br0 tap0 tag=9
+
+   but the VM can't access the external network or the Internet.
+
+A: VLANs partition a network into isolated pieces (see "What's a
+   VLAN?" above).  Probably, your external network doesn't have the
+   machines you are trying to access available on VLAN 9.
+
 Q: Can I configure an IP address on a VLAN?
 
 A: Yes.  Use an "internal port" configured as an access port.  For
-- 
1.7.10.4




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