I've tested
# terminal 1
root@vs-master:~# brctl delif virbr1 veth0
root@vs-master:~# brctl addif br0 veth0
root@vs-master:~# ip link set veth1 netns 5039
root@vs-master:~# nc -4 -k -l 8080
# terminal 2
root@vs-master:~# /bin/ns_exec -cmn /bin/bash
about to clone with 40020000
clone: Invalid argument
root@vs-master:~# echo $$
5039
root@vs-master:~# ifconfig veth1 192.168.1.214
root@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@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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https://bugs.launchpad.net/bugs/616064
Title:
Broken networking in kvm guests
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