Source or destination
The source or destination of a firewall rule determines the allowed IP address range for requests, depending on the firewall rule’s direction. Ingress rules specify the allowed request origins, specified as IP address ranges, tags, or service accounts. Egress rules specify where outbound requests may be directed, and only support IP address ranges.
Note that source ranges and source tags may be used together on a single firewall rule. This results in all traffic matching either the IP ranges or tags (union). Example uses of this combination may be to allow all traffic within the subnet (via IP range), as well as a specific group of instances outside of the subnet (via tags). If no source or destination is specified, ...
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