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Old 12-15-2011, 08:21 AM
"Amit Tewari"
Default macvtap not working on rhel 6.1 x86 machine

Hi all,

My test environment

Host os=rhel6.1 x86 machine

Guest os = rhel6.1


Kvm hypervisor

I am creating macvtap interface on host machine

ip link add link eth1 name macvtap0 type macvtap

ip link set macvtap0 up

ip link show macvtap0

25: macvtap0@eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
pfifo_fast state UNKNOWN qlen 500

link/ether a2:70:4e:05:4a:4e brd ff:ff:ff:ff:ff:ff

Now when use arp -a to check macvtap0 hardware address entry it shows

? ( at <incomplete> on macvtap0

If I assign ip address to macvtap and then ping on network , it says
"destination not reachable"

ping -I macvtap0

PING ( from macvtap0: 56(84) bytes of data.

>From icmp_seq=2 Destination Host Unreachable

>From icmp_seq=3 Destination Host Unreachable

If I use tcpdump -I eth1 it shows packets

14:42:39.967158 ARP, Request who-has tell, length 28

14:42:39.967257 ARP, Reply is-at 00:16:35:65:b5:1e (oui
Unknown), length 46

14:42:40.967167 ARP, Request who-has tell, length 28

14:42:40.967229 ARP, Reply is-at 00:16:35:65:b5:1e (oui
Unknown), length 46

So macvtap0 is unknown interface. Request does go to eth1 inteface.

Please let me know redhat 6.1 support macvtap or not?...

I have to use it for kvm virtual machine..

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