Found the issue. I believe it is a Fedora (25) issue, but not sure
yet. So, registering here for the archives.
My IPA is on a FC25 on a LXC container (2.0.6) on a Jessie host.
The IPA container ethernet is on a private bridge (not attached to any
The FC container was configured to do an offloading checksum. I believe
it was FC's fault, but could be some other lxc host on the same bridge,
Anyways, this command disabled offloading and it start to work:
# ethtool --offload eth0 rx off tx off gso off
Still, why only the 2k8 r2 complained about this, still have to be verified.
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