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I need to config two different MAC and IP addresses on the same physical device (eth1).

But when I configure a macvlan interface in the default/global namespace and configure a vlan on top of it. I can ping the vlan IP address directly from a external host, without tagging it (ping). But on the other side: tagged pings does not work. The same happens when I set up the network configuration in a non-global/non-default namespace.

ip addr add 169.254.255.126/16 dev eth1
ip link set dev eth1 up
# ping 169.254.255.126 # PING from external host is working: fine

ip link add macvlan link eth1 type macvlan mode bridge
ip addr add 169.254.255.127/16 dev macvlan
ip link set dev macvlan up
# ping 169.254.255.127 # PING from external host is working: fine

ip link add link macvlan name vlan2 type vlan id 2
ip addr add 169.254.255.128/16 dev vlan2
ip link set dev vlan2 up
# ping 169.254.255.128 # PING from external host works without vlan tag: FAIL
# ping 169.254.255.128 -I VLAN2 # no PING response external host with vlan tag: FAIL

So how can I set up two virtual interfaces (different MAC+IP) on the same physical interface in its global/default namespace, which are acting like real devices?

Optional: If global is no option, namespaces are acceptable.

FYI: I tested it on UBUNTU 18.04 with kernel 5.4 and also an embedded buildroot system with kernel 4.9 (both times, same result).

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1 Answer 1

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After some tests and further research the problem is that I tried to place multiple IP addresses from the same network area to multiple network interfaces.

To make this work non-global namespaces are required.

So we can close this issue here. Thanks

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