Comment 8 for bug 1831935

Looking at the code I could only find the invocations of functions that add metadata-related iptables rules into qrouter namespaces, not qdhcp namespaces:

➜ neutron git:(stable/queens) ✗ grep -RiP metadata_filter_rules

neutron/agent/metadata/driver.py: def metadata_filter_rules(cls, port, mark):
neutron/agent/metadata/driver.py: for c, r in proxy.metadata_filter_rules(proxy.metadata_port,

https://github.com/openstack/neutron/blob/stable/queens/neutron/agent/metadata/driver.py#L172-L196
https://github.com/openstack/neutron/blob/stable/queens/neutron/agent/metadata/driver.py#L286-L294