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I have a setup on CentOS 6.5

Host configuration:

macvlan0-> 10.0.0.2/24
ppp0 -> connected to the internet

Guest configuration

macvtap0-> 10.0.0.4/24
gateway -> 10.0.0.2

Other host on same network

eth0 -> 10.0.0.3/24
gateway -> 10.0.0.2

Ping results

from 10.0.0.2 to 10.0.0.4 and vice versa : OK
from 10.0.0.2 to 10.0.0.3 and vice versa : OK
from 10.0.0.3 to 10.0.0.4 and vice versa : OK
from 10.0.0.2 to out-network : OK
from 10.0.0.3 to out-network : OK
from 10.0.0.4 to out-network : OK

http result

within the network : OK
from 10.0.0.2 to out-network : OK
from 10.0.0.3 to out-network : OK
from 10.0.0.4 to out-network : FAILED

I ran the following command:

$ echo 255 > /proc/sys/net/netfilter/nf_conntrack_log_invalid

and got the below error:

kernel:nf_ct_tcp: invalid packet ignored
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