[Bug 1626826] [NEW] KVM guest cannot use br0 created by brctl on Ubuntu16.04

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== Comment: #0 - QI YE  - 2016-09-22 06:01:59 ==
---Problem Description---
Ubuntu16.04. Created a bridge br0 on enc100 via brctl.  enc100 is the only external accessible nic. Defined a ubuntu guest to use br0 and assigned an IP to the guest in the same subnet as br0. After started the guest, couldn't access external servers or internet from the guest. 
 

---uname output---
Linux ntc170 4.4.0-38-generic #57-Ubuntu SMP Tue Sep 6 15:47:15 UTC 2016 s390x s 390x s390x GNU/Linux
 
Machine Type = 2827 (z Systems EC12) 
 
---Debugger---
A debugger is not configured
 
---Steps to Reproduce---
 1. define br0 on enc100 via brctl command (IP on br0 is 192.168.1.170 for example)
2. update /etc/network/interfaces
3. create a guest on KVM and use br0 for it's nic
4. Start guest via virsh command and assign an IP, e.g. 192.168.1.171.  After installation, cannot access external systems via KVM host.

== Comment: #2 - QI YE  - 2016-09-22 09:53:58 ==
attached sosreport file

** Affects: bridge-utils (Ubuntu)
     Importance: Undecided
     Assignee: Skipper Bug Screeners (skipper-screen-team)
         Status: New


** Tags: architecture-s39064 bugnameltc-146632 severity-critical targetmilestone-inin16041
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KVM guest cannot use br0 created by brctl on Ubuntu16.04
https://bugs.launchpad.net/bugs/1626826
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