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    # 您好,TANET NOC ``` 我是中央大學的學生,我發現校內網路連線常常出現繞路現象 粗略調查後得知,交大/中央雖然有接入TANet,但是TANet對外廣播的BGP路由有打開路由聚合,會被聚合成 140.112.0.0/12 單一一條路由。但又因為交大和中央大學有買NTT transit,會經由NTT線路對外廣播 140.113.0.0/16(交通大學) 140.115.0.0/16(中央大學) 路由。 因為 /16 比 /12 更精確,所以永遠是最優先路由。我們的TANet線路相當於不存在。所以教育部或是其他國家機關,還有其他ISP連線去交大和中央通通會走NTT線路,甚至繞路出國。請問能不能關閉BGP路由聚合呢? 如果無法全部關閉,請問能不能針對 140.113.0.0/16(交通大學) 140.115.0.0/16(中央大學) 關閉呢? 讓我校和交通大學使用到TANet優質的網路線路 ``` # 您好,TANET ``` 我對TANET的架構了解不深,但依照我個人淺薄的理解,這並不是交通大學的問題 交通大學正確地把 140.113.0.0/16(交通大學) 140.115.0.0/16(中央大學) 路由播給TANET 了,問題是出在 TANET 收到以後,並沒有把 140.(113/115).0.0/16 再播給教育部和其他上游,而是變成 140.112.0.0/12 才發給教育部和其他上游。 教育部和其他上游收到來自NTT香港的 140.113.0.0/16 路由比 TANET 來的 140.112.0.0/12 更精確,所以更優先,所以教育部往交通大學會繞路香港而不走 TANET。 並且同樣的問題也發生在中央大學身上 至於您回信中提到的需要臺灣學術網路管理會或技術小組審議後才予以施行,懇請幫忙反映現在的設定會導致這個問題,並幫忙修正。 並且現在教育部和TANET其他上游連線往交通大學/中央大學時,不走TANET,而是繞路香港/日本的問題確實存在 依我我個人建議,其中一個可能的修正方法可以是對上游關閉路由匯聚,或是廣播給發給教育部和其他上游的時候額外多播 140.113.0.0/16(交通大學) 140.115.0.0/16(中央大學) 這兩條路由,或是你們再討論一下其他的修正方式 十分感謝,Best Regard ```

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