=== Connectivity Matrix ===
+-----------+-----+------+----+-------+---------+
| src \ dst | ISP | PCCW | PT | Tier1 | YouTube |
+-----------+-----+------+----+-------+---------+
|    ISP    |  -- |  OK  | OK |   OK  |    OK   |
|    PCCW   |  OK |  --  | OK |   OK  |    OK   |
|     PT    |  OK |  OK  | -- |   OK  |    OK   |
|   Tier1   |  OK |  OK  | OK |   --  |    OK   |
|  YouTube  |  OK |  OK  | OK |   OK  |    --   |
+-----------+-----+------+----+-------+---------+

=== Routing Tables ===

--- ISP ---
default via 10.0.23.1 dev ISP-eth0 
10.0.23.0/30 dev ISP-eth0 proto kernel scope link src 10.0.23.2 
63.218.0.1 via 10.0.23.1 dev ISP-eth0 
154.54.0.1 via 10.0.23.1 dev ISP-eth0 
203.82.48.1 via 10.0.23.1 dev ISP-eth0 
208.65.153.1 via 10.0.23.1 dev ISP-eth0
--- PCCW ---
10.0.21.0/30 dev PCCW-eth0 proto kernel scope link src 10.0.21.2 
10.0.22.0/30 dev PCCW-eth1 proto kernel scope link src 10.0.22.1 
10.0.23.0/30 dev PCCW-eth2 proto kernel scope link src 10.0.23.1 
117.20.0.0/24 via 10.0.23.2 dev PCCW-eth2 
117.20.0.1 via 10.0.23.2 dev PCCW-eth2 
154.54.0.0/16 via 10.0.21.1 dev PCCW-eth0 
203.82.48.0/24 via 10.0.22.2 dev PCCW-eth1 
203.82.48.1 via 10.0.22.2 dev PCCW-eth1 
208.65.153.0/24 via 10.0.21.1 dev PCCW-eth0
--- PT ---
default via 10.0.22.1 dev PT-eth0 
10.0.22.0/30 dev PT-eth0 proto kernel scope link src 10.0.22.2 
63.218.0.1 via 10.0.22.1 dev PT-eth0 
117.20.0.1 via 10.0.22.1 dev PT-eth0 
154.54.0.1 via 10.0.22.1 dev PT-eth0 
208.65.153.1 via 10.0.22.1 dev PT-eth0
--- Tier1 ---
10.0.20.0/30 dev Tier1-eth0 proto kernel scope link src 10.0.20.2 
10.0.21.0/30 dev Tier1-eth1 proto kernel scope link src 10.0.21.1 
63.218.0.0/24 via 10.0.21.2 dev Tier1-eth1 
117.20.0.0/24 via 10.0.21.2 dev Tier1-eth1 
203.82.48.0/24 via 10.0.21.2 dev Tier1-eth1 
208.65.153.0/24 via 10.0.20.1 dev Tier1-eth0
--- YouTube ---
default via 10.0.20.2 dev YouTube-eth0 
10.0.20.0/30 dev YouTube-eth0 proto kernel scope link src 10.0.20.1 
63.218.0.1 via 10.0.20.2 dev YouTube-eth0 
117.20.0.1 via 10.0.20.2 dev YouTube-eth0 
154.54.0.1 via 10.0.20.2 dev YouTube-eth0 
203.82.48.1 via 10.0.20.2 dev YouTube-eth0