**8. Acknowledgment**

After the earthquake, KDDI OTC (Otemachi Technical Center) worked very hard to fix the routing problems of APAN Tokyo XP both in their capacity as paid staff and as volunteers. Yutaka Watanabe, OTC's director, took the MRTG snapshot of Figs. 8 and 9. AARNET NOC offered us the backup routes to access the TEIN2. KOREN NOC worked very hard to keep communication open between CERNET and ASNET even during the holiday. Hawaii University NOC worked very hard to keep control of this complicated routing. KDDI investigated the reason for the communication failures in the APAN area and gave useful advice to APAN Tokyo XP. The staff of Genkai XP NOC accepted CERNET's traffic from KOREN by upgrading the JP-KR link bandwidth. Due to these great efforts and the collaboration among the network engineers, we were able to quickly restore the Asia Pacific R&E networks.

This research was supported by the MIC (Ministry of Information and Communication), Korea, under the ITRC (Information Technology Research Center) support program supervised by the IITA (Institute of Information Technology Assessment) (NIPA-2011- C1090-1131-0005).

