[Bug 616064] Re: Broken networking in kvm guests

[Anthony O.]

I've tested

# terminal 1
root at vs-master:~# brctl delif virbr1 veth0
root at vs-master:~# brctl addif br0 veth0
root at vs-master:~# ip link set veth1 netns 5039
root at vs-master:~# nc -4 -k -l 8080

# terminal 2
root at vs-master:~# /bin/ns_exec -cmn /bin/bash
about to clone with 40020000
clone: Invalid argument
root at vs-master:~# echo $$
5039
root at vs-master:~# ifconfig veth1 192.168.1.214
root at vs-master:~# ifconfig veth1
veth1     Link encap:Ethernet  HWaddr 1a:13:2e:39:53:2e
          inet adr:192.168.1.214  Bcast:192.168.1.255  Masque:255.255.255.0
          adr inet6: fe80::1813:2eff:fe39:532e/64 Scope:Lien
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Packets reçus:3202 erreurs:0 :0 overruns:0 frame:0
          TX packets:193 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:1000
          Octets reçus:123117 (123.1 KB) Octets transmis:39048 (39.0 KB)

>From my client :
user at host:~$ S=a; N=1; while [ 1 ]; do echo $N$S | nc 192.168.1.214 8080; ((N += 1)); S=${S}a; sleep 0.5s; done

The server (terminal 1) displays the strings without problems.

But I tried to stress it a bit more (with sleep 0.01s) and around 220 it
starts to lag a bit (but is not stuck anyway, still delivers the
content).

Moreover, I tried to use wireshark in order to show ARP packets, flushed
my local arp cache but without more results : the IP is resolved once
and then no more, and the TCP connection still sticks later.

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Title:
  Broken networking in kvm guests

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