Singapore occasionally has some quirky routing, i.e. traffic from a client in SG will route via the United States in order to get to a server in SG. E.g.,
Host Loss% Snt Last Avg Best Wrst StDev 1. sw-sv-10.ofs.edu.sg 0.0% 6 2.4 2.4 2.3 2.6 0.1 2. fw1-svcint.ofs.edu.sg 0.0% 6 0.3 0.3 0.3 0.4 0.0 3. ofsgw-fe0.ofs.edu.sg 0.0% 6 0.8 0.9 0.8 1.0 0.1 4. s5-0-1-8-r10.cyberway.com.sg 0.0% 6 6.2 4.3 2.5 6.2 1.7 5. 203.118.7.14 0.0% 6 2.5 3.3 2.5 6.8 1.7 6. 203.118.3.227 0.0% 6 7.6 7.1 5.1 9.3 1.5 7. so-7-0-3.edge3.SanJose1.Level3.net 0.0% 6 210.4 224.7 209.3 266.9 24.4 8. ae-22-79.car2.SanJose1.Level3.net 0.0% 6 209.5 217.1 209.5 238.9 11.3 ae-32-89.car2.SanJose1.Level3.net ae-42-99.car2.SanJose1.Level3.net ae-12-69.car2.SanJose1.Level3.net 9. SINGAPORE-T.car2.SanJose1.Level3.net 0.0% 6 208.9 211.7 208.9 218.1 4.0 10. ge-5-0-0-0.plapx-cr2.ix.singtel.com 0.0% 6 208.5 209.3 203.7 218.7 6.3 ge-5-0-0-0.plapx-cr3.ix.singtel.com 11. so-2-0-3-0.sngtp-cr2.ix.singtel.com 0.0% 6 295.4 296.8 289.7 312.0 8.8 so-2-0-2-0.sngtp-cr1.ix.singtel.com 12. ge-1-0-0-0.sngtp-dr2.ix.singtel.com 0.0% 6 284.0 291.4 284.0 302.3 7.6 ge-0-0-0-0.sngtp-dr2.ix.singtel.com 13. 202.160.250.230 0.0% 6 210.7 213.7 209.2 217.1 3.5 14. 203.208.232.38 0.0% 5 215.6 212.4 209.6 216.3 3.3 15. 203.208.232.53 0.0% 5 209.3 214.8 209.3 216.4 3.0 16. ae-5-920.sg-br08.eznetsols.com 0.0% 5 219.0 221.9 212.2 243.5 12.4 17. ae-3-7.sg-cr02.eznetsols.com 0.0% 5 220.1 216.3 213.5 220.1 3.4 18. ae-0-17.dr02a.idc1.sg.eznetsols.com 0.0% 5 212.2 216.3 212.2 218.4 2.9 19. re-2-16.ssgw02.idc1.sg.eznetsols.com 0.0% 5 217.8 213.9 211.0 217.8 3.5 20. www.oss.eznetsols.org 0.0% 5 211.7 214.1 211.5 218.1 3.5
I created a quick shell script client below so that people could help out in the mapping to see how commonly these routing issues occur. It's a short script that grabs the current list of subnets (currently a little over 400) and runs a traceroute to one IP in each netblock. Then it uploads the results to the data directory.
An example run of the script looks like:$ wget -q http://www.haller.ws/projects/sg-interconnectivity/routing-data-capture.sh $ bash routing-data-capture.sh found binary '/bin/traceroute' loading subnets... mapping connectivity in singapore by largest CIDR... 58.65.0.0 58.145.192.0Thanks for helping out!
| Name | Last Modified | Size | Type |
|---|---|---|---|
| ../ | - | Directory | |
| data/ | 2018-Feb-20 08:53:24 | - | Directory |
| routing-data-capture.sh | 2018-Feb-20 08:53:24 | 1.9K | text/plain |
| routing-sg-subnets.txt | 2018-Feb-20 08:53:24 | 5.2K | text/plain |