A VPN gateway set-up where traffic flows through both instances simultaneously, each having a separate tunnel and public IP. Servicing one instance therefore disrupts connections less than under default active-standby.
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Terms in this definition
- VPN gateway
Terminates IPsec tunnels for site-to-site, point-to-site and VNet-to-VNet connections, as a VPN-type virtual network gateway in GatewaySubnet. It gets a Standard static public IP when created, and that IP can't be swapped.
- WHERE
Limits a SELECT, UPDATE or DELETE to just the rows meeting a condition. Omit it, and the statement hits every row.
- HAVING
Applies a condition to groups produced by GROUP BY, often on an aggregate such as SUM(). WHERE works earlier, on individual rows before they are grouped.
Related terms
- ECMP
Equal-cost multipath. Traffic is spread over several equally good routes simultaneously; active-active Tier-0 gateways use it, together with BGP, across Edge nodes for north-south flows.
- HA Ports
A rule on an internal Standard Load Balancer, using protocol All and port 0, that balances every TCP and UDP flow on every port, which suits active-active NVAs.
- VPN gateway health probe
A healthy VPN gateway responds at https://<gateway public IP>:8081/healthprobe; in active-active mode the second instance uses port 8083.