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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) 
A debugger is not configured
---Steps to Reproduce---
 1. define br0 on enc100 via brctl command (IP on br0 is for 
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.  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 
KVM guest cannot use br0 created by brctl on Ubuntu16.04
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