[Bridge] Help with Ubuntu + bridge + tap + qemu + Windows

[David Logan]

Hi guys

I have been researching this problem for weeks, and I have tried everything every web page has even remotely suggested, and nothing works. I am at my wits end, and I simply *must* get my issue resolved.

Basically, when I bring up one or more VMs using tap# on a br# on an eth#, the network interface will work for a random amount of time, but inevitably something will die, and the “TX packets” stops incrementing, and the “TX packets dropped” takes over. At that point, I can shut down and start up my VM, and go through the cycle again with a different random time and packets transmitted.

tap2      Link encap:Ethernet  HWaddr 8a:21:a8:cb:f5:98  
          inet6 addr: fe80::8821:a8ff:fecb:f598/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:51870 errors:0 dropped:0 overruns:0 frame:0
          TX packets:741595 errors:0 dropped:5702 overruns:0 carrier:0
          collisions:0 txqueuelen:500 
          RX bytes:3220139 (3.2 MB)  TX bytes:1113177111 (1.1 GB)

I could obviously post every shred of information I have, ethtool, iptables, netstat, brctl, etc. but I hate to create a 10K email with mostly unnecessary outputs. If anyone has a specific set of questions they need answered, I am more than happy to provide. I’m running the latest Ubuntu and get updates daily. The uname -a as of this morning is:

Darwin Carolyns-MacBook-Air.local 15.3.0 Darwin Kernel Version 15.3.0: Thu Dec 10 18:40:58 PST 2015; root:xnu-3248.30.4~1/RELEASE_X86_64 x86_64

What in the world am I doing wrong, or where is this failing, how do I find it, and most importantly, how do I fix it? :)

Thank you,
David Logan

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