How to identify CN2 GIA and CN2 GT lines

How to distinguish between CN2 GIA and CN2 GT lines

Many people don’t understand. When they see the 59.43 route, they say it’s GIA. They say everything, some say return, some say China Unicom also takes the 59.43 route. Nonsense.

Here's how to identify it. Must be tested with Shanghai Telecom test node. For servers in other regions, if there are no CN2 access points in some cities in mainland China, they will go to the backbone network at 202.97. Then go 59.43.

CN2 GT will take the node 202.97 from the beginning of the Shanghai Telecom test route.

The CN2 GIA line will go directly to the routing address of 59.43 when testing the routing at the Shanghai Telecom node. Does not pass through any 202.97 nodes.

As shown below:

CN2 GT passes 202.97 from Shanghai Telecom test route

CN2 GIA test route from Shanghai Telecom does not go through any 202.97 nodes

Tip: If you test from other areas in mainland China, such as Nanyang and Zhenjiang, CN2 GIA will also use the 202.97 route. Because this part of mainland China still has to go through the backbone network, because these cities do not have CN2 access points.

Other knowledge: Shanghai Telecom is the CN2 routing exit point to the Western United States. We all know that there are several types of international telecommunications lines: 163, CN2 GT, and CN2 GIA. The CN2 GT shares the export with the 163. Therefore, the first part of the routing requires 202.97 backbone routing. The CN2 GIA is an independent line and has no influence on the 163 CN2GT line.

Some service providers now use the 163 direct line from China to the United States, and the return route from the United States to China uses the CN2 GIA line. This solution is currently the best solution compatible with speed and attack resistance. The CN2 GIA line capacity is not large enough to withstand attacks. At this time, the node 59.43 cannot be measured from mainland China. Only the return route from the server to mainland China can be measured.

Backhaul routing test method:

Use the command mtr -rw ip to test.

The cities currently known to have CN2 access points are as follows: Chengdu, Nanjing, Xi'an, Wuhan, Urumqi, Guangzhou, Shanghai, and Beijing

The IP routing information tested by CN2 GIA in these cities will not pass through the 202.97 node. If it does, it is not GIA!

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