我们在亚马逊上安装了两个Cassandra数据中心，第二个在通过VPN连接的服务器上。所有节点都正常工作，但本地数据中心将所有Amazon DC节点标记为关闭，Amazon DC将本地节点标记为关闭。
以下是本地数据中心的视图
Datacenter: dca
===============
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
-- Address Load Tokens Owns Host ID Rack
DN 192.168.1.168 146.1 GB 32 ? 08aa50da-c3c7-42bf-820c-89f4379de519 r1
DN 192.168.1.169 149.6 GB 32 ? 7de66517-aa82-4da0-9e5d-4170f135cbd5 r1
DN 192.168.1.170 166.86 GB 32 ? d756995d-1dfc-466a-bb83-243d7f78badd r1
DN 192.168.1.171 162.1 GB 32 ? 525e9050-c732-4406-abe8-4fed3d2e86bb r1
DN 192.168.1.172 181.21 GB 32 ? 7e022e0e-2605-4f28-bc5d-d99a1926bbcc r1
DN 192.168.1.173 149.8 GB 32 ? 8c7eb22b-9efb-4aa7-be9b-2e9c0a6ff5c5 r1
Datacenter: dcl
===============
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
-- Address Load Tokens Owns Host ID Rack
UN 10.0.12.2 157.63 GB 32 ? b3045e13-f42c-4047-88fa-354c522d2f8e r0
UN 10.0.12.3 135.53 GB 32 ? 2a2eca02-13da-4ce0-926a-86f126c9f747 r0
UN 10.0.12.4 119.9 GB 32 ? 199c8145-fc00-4d97-a395-8658a058fcea r0
UN 10.0.12.5 132.68 GB 32 ? 7af84cbd-62be-40ee-a0f1-5ebd09855a17 r0
UN 10.0.12.6 134.57 GB 32 ? 91081b02-73f5-4d6a-aa5c-6509e38f93d0 r0
UN 10.0.12.7 114.08 GB 32 ? 9f41e674-82fe-43c2-b392-5aa79f65c17d r0
UN 10.0.12.8 155.04 GB 32 ? 4509a892-be68-4b69-af7b-c1dd32fe466b r0
UN 10.0.12.9 149.73 GB 32 ? 8bde10c0-6ebb-402f-b2d1-79f4bcc6b12b r0
UN 10.0.12.10 100.65 GB 32 ? 51a8ab7a-f898-4d4a-a8fd-87dabbaedd28 r0
这来自亚马逊DC
Datacenter: dca
===============
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
-- Address Load Tokens Owns Host ID Rack
UN 192.168.1.168 154.03 GB 32 ? 08aa50da-c3c7-42bf-820c-89f4379de519 r1
UN 192.168.1.169 157.16 GB 32 ? 7de66517-aa82-4da0-9e5d-4170f135cbd5 r1
UN 192.168.1.170 176.96 GB 32 ? d756995d-1dfc-466a-bb83-243d7f78badd r1
UN 192.168.1.171 170.36 GB 32 ? 525e9050-c732-4406-abe8-4fed3d2e86bb r1
UN 192.168.1.172 190.44 GB 32 ? 7e022e0e-2605-4f28-bc5d-d99a1926bbcc r1
UN 192.168.1.173 157.84 GB 32 ? 8c7eb22b-9efb-4aa7-be9b-2e9c0a6ff5c5 r1
Datacenter: dcl
===============
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
-- Address Load Tokens Owns Host ID Rack
DN 10.0.12.2 ? 32 ? b3045e13-f42c-4047-88fa-354c522d2f8e r0
DN 10.0.12.3 ? 32 ? 2a2eca02-13da-4ce0-926a-86f126c9f747 r0
DN 10.0.12.4 ? 32 ? 199c8145-fc00-4d97-a395-8658a058fcea r0
DN 10.0.12.5 ? 32 ? 7af84cbd-62be-40ee-a0f1-5ebd09855a17 r0
DN 10.0.12.6 ? 32 ? 91081b02-73f5-4d6a-aa5c-6509e38f93d0 r0
DN 10.0.12.7 ? 32 ? 9f41e674-82fe-43c2-b392-5aa79f65c17d r0
DN 10.0.12.8 ? 32 ? 4509a892-be68-4b69-af7b-c1dd32fe466b r0
DN 10.0.12.9 ? 32 ? 8bde10c0-6ebb-402f-b2d1-79f4bcc6b12b r0
DN 10.0.12.10 ? 32 ? 51a8ab7a-f898-4d4a-a8fd-87dabbaedd28 r0
我该如何调查此问题？