Month: January 2019

Routing table

I recently created a Azure SQL Managed Instance as a proof of concept for a project I was working on. Created through the portal it also created a routing table with 31 routes to the Internet which initially confused me.

On reflection, suspecting a simple answer, I set about working out the routing which I’ve shared.

Combined RouteIndividual CIDR routes
0.0.0.0 to 9.255.255.2550.0.0.0/5 + 8.0.0.0/7
11.0.0.0 to 172.15.255.25511.0.0.0/8 + 12.0.0.0/6 + 16.0.0.0/4 + 32.0.0.0/3 + 64.0.0.0/2 128.0.0.0/3 + 160.0.0.0/5 + 168.0.0.0/6 + 172.0.0.0/12
172.32.0.0 to 192.167.255.255172.32.0.0/11 + 172.64.0.0/10 + 172.128.0.0/9 + 173.0.0.0/8 + 173.0.0.0/8 + 174.0.0.0/7 + 176.0.0.0/4 + 192.0.0.0/9 + 192.128.0.0/11 + 192.160.0.0/13
192.169.0.0 to 255.255.255.255192.169.0.0/16 + 192.170.0.0/15 + 192.172.0.0/14 + 192.176.0.0/12 + 192.192.0.0/10 + 193.0.0.0/8 + 194.0.0.0/7 + 196.0.0.0/6 + 200.0.0.0/5 + 208.0.0.0/4 + 224.0.0.0/3

Yes, this basically routes everything apart from the private IP address ranges (10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16) to the Internet.

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