> Can you try the same test with two macvlan interfaces on the host (no
> macvtap)? You may need to use the ping -I <interface-address>
> argument to force the ping source address to a specific macvlan
> interface.
>
> If you see the same problem, it may just be the macvlan design - it is
> stacked on top of eth0 and might not work when eth0 is down. CCing
> macvlan/macvtap folks.
>
> Stefan
>
tested as below
$ifconfig
eth0 Link encap:Ethernet HWaddr f4:6d:xx:xx:xx:xx
inet6 addr: fe80::xx:xx:xx:xx/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:86507 errors:0 dropped:0 overruns:0 frame:0
TX packets:55940 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:126005746 (120.1 MiB) TX bytes:4394225 (4.1 MiB)
macvtap0 Link encap:Ethernet HWaddr 52:54:xx:xx:xx:xx
inet6 addr: fe80::xx:xx:xx:xx/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:70 errors:0 dropped:0 overruns:0 frame:0
TX packets:84 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:9036 (8.8 KiB) TX bytes:14734 (14.3 KiB)
znet0 Link encap:Ethernet HWaddr 00:60:xx:xx:xx:92
inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: 2002:xx:xx:xx:xx/64 Scope:Global
inet6 addr: fe80:xx:xx:xx:xx/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4463190 errors:0 dropped:0 overruns:0 frame:0
TX packets:12527522 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:3959213697 (3.6 GiB) TX bytes:18590336476 (17.3 GiB)
znet1 Link encap:Ethernet HWaddr 00:60:xx:xx:xx:99
inet addr:192.168.1.177 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: 2002:xx:xx:xx:xx64 Scope:Global
inet6 addr: fe80:xx:xx:xx:xx/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8 errors:0 dropped:0 overruns:0 frame:0
TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1399 (1.3 KiB) TX bytes:1522 (1.4 KiB)
$ ip -d link show
10: znet0@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UP mode DEFAULT
link/ether 00:60:xx:xx:xx:92 brd ff:ff:ff:ff:ff:ff
macvlan mode bridge
15: znet1@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UNKNOWN mode DEFAULT
link/ether 00:60:xx:xx:xx:99 brd ff:ff:ff:ff:ff:ff
macvlan mode bridge
the macvlan interface cannot ping each other no matter network cable is plugged
or not
$ ping -I 192.168.1.2 192.168.1.177
PING 192.168.1.177 (192.168.1.177) from 192.168.1.2 : 56(84) bytes of data.
--- 192.168.1.177 ping statistics ---
6 packets transmitted, 0 received, 100% packet loss, time 4999ms
I also perform an additional test: the guests (macvtap bridge mode) CAN
communicate each other no matter network cable is plugged or not.
