Hi,
it seems that util.py extract_flow in destiny branch is not
consistent with install_datapath_flow. I tried to install a flow
extracted from a packet and the resulting match failed to capture the
same packet stream.
More precisely, if a packet is an ARP packet, extract_flow returns
following attributes:
{'dl_type': 2054, 'nw_dst': 0, 'dl_vlan_pcp': 0, 'dl_src': array('B',
[0, 0, 0, 0, 0, 11]), 'nw_proto': 1, 'nw_tos': 0, 'tp_dst': 0,
'tp_src': 0, 'dl_dst': array('B', [255, 255, 255, 255, 255, 255]),
'dl_vlan': 65535, 'nw_src': 0}
Now If I install the flow using these attributes, the switch still
forwards the packets to the controller. I experimentally found that
del match[core.NW_DST]
del match[core.NW_SRC]
solves the problem. According to the
http://www.openflow.org/wk/index.php/OpenFlow_1.0_release_notes#Match_on_IP_fields_in_ARP_packets
it seems that nw_src and nw_dst should contain actual IPs from ARP and
not zeroes.
Kind regards
Peter Peresini
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