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Azure Virtual Network FAQ #14

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maystani opened this issue Sep 4, 2023 · 0 comments

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maystani commented Sep 4, 2023 •

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Microsoft recommends using the IP range for private networks as recommended by the Internet Assigned Numbers Authority (IANA):

0.0.0–10.255.255.255 (10/8 prefix)
16.0.0–172.31.255.255 (172.16/12 prefix)
168.0.0–192.168.255.255 (192.168/16 prefix)

In addition, in Microsoft Azure, you can’t use the following ranges because they are reserved by the platform:

0.0.0/4 (Multicast)
255.255.255/32 (Broadcast)
0.0.0/8 (Loopback)
254.0.0/16 (Link-local)
63.129.16/32 (internal domain name service [DNS])

The following IPs are reserved by Microsoft Azure:

x.x.0: Network address.
x.x.1: Default gateway.
x.x.2, x.x.x.3: To map the Microsoft Azure DNS IPs to the VNet space.
x.x.255: Network broadcast address.

At the time of publishing, following are the recommendations from Microsoft:

GatewaySubnet: /27 or larger
AzureBastionSubnet: /27 or larger
Microsoft Azure NetApp Files Subnet: /28 or higher

Reference: https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-faq

maystani changed the title ~~WIP - Azure Virtual Network FAQ~~ Azure Virtual Network FAQ

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