"OVS 流 - Ping 正常工作，其他流量不正常"

Question

有人可以解释为什么以下流配置（这些流是桥上唯一的流）不能按预期工作吗？

我可以 ping 每一侧的主机，但其他流量（例如 web/ssh 等不通过）。

ovs-ofctl add-flow xl1 dl_type=0x800,nw_src=10.2.0.0/20,nw_dst=10.2.1.0/24,actions=output:73
ovs-ofctl add-flow xl1 dl_type=0x800,nw_src=10.2.0.0/20,nw_dst=10.2.2.0/24,actions=output:76
ovs-ofctl add-flow xl1 arp,nw_dst=10.2.1.0/24,actions=output:73
ovs-ofctl add-flow xl1 arp,nw_dst=10.2.2.0/24,actions=output:76

痕迹当然似乎表明流量应该通过：

ovs-appctl ofproto/trace xl1 in_port=73,tcp,nw_src=10.
2.1.1,nw_dst=10.2.2.1,tcp_dst=22
Bridge: xl1
Flow: tcp,metadata=0,in_port=73,vlan_tci=0x0000,dl_src=00:00:00:00:00:00,dl_dst=00:00:00:00:00:00,nw_src=10.2.1.1,nw_dst=10.2.2.1,nw_tos=0,nw_ecn=0,nw_ttl=0,tp_src=0,tp_dst=22,tcp_flags=0x000
Rule: table=0 cookie=0 ip,nw_src=10.2.0.0/20,nw_dst=10.2.2.0/24
OpenFlow actions=output:76

Final flow: unchanged
Megaflow: skb_priority=0,ip,in_port=73,nw_src=10.2.0.0/20,nw_dst=10.2.2.1,nw_frag=no
Datapath actions: 76

ovs-appctl ofproto/trace xl1 in_port=76,tcp,nw_src=10.
2.2.1,nw_dst=10.2.1.1,tcp_dst=22
Bridge: xl1
Flow: tcp,metadata=0,in_port=76,vlan_tci=0x0000,dl_src=00:00:00:00:00:00,dl_dst=00:00:00:00:00:00,nw_src=10.2.2.1,nw_dst=10.2.1.1,nw_tos=0,nw_ecn=0,nw_ttl=0,tp_src=0,tp_dst=22,tcp_flags=0x000
Rule: table=0 cookie=0 ip,nw_src=10.2.0.0/20,nw_dst=10.2.1.0/24
OpenFlow actions=output:73

Final flow: unchanged
Megaflow: skb_priority=0,ip,in_port=76,nw_src=10.2.0.0/20,nw_dst=10.2.1.1,nw_frag=no
Datapath actions: 73