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nt project add alias ip ranges overview configure alias ip ranges bring your own ip addresses byoip overview planning and architecture create a public advertised prefix create public delegated prefixes create ipv4 sub prefixes and ip addresses create and use ipv6 sub prefixes manage bgp announcement deprovision byoip add routes routes overview static routes overview use routes add policy based routes overview use policy based routes change mtu overview change mtu of a vpc network create and verify a jumbo frame mtu network access ipv4 destinations from ipv6 only instances overview configure ipv6 only subnets and instances with dns64 and nat64 configure vms add network tags add vms with multiple network interfaces overview create vms with multiple network interfaces configure dynamic nics add dynamic nics delete dynamic nics configure routing for an additional network interface troubleshoot add capabilities network connectivity center overview connect vpc networks by using vpc spokes vpc network peering overview about peering connections set up and manage vpc network peering peer two vpc networks shared vpc overview provision shared vpc deprovision shared vpc hybrid subnets about migrating to google cloud with hybrid subnets prepare for hybrid subnets connectivity migrate to google cloud with hybrid subnets disable hybrid subnet routing internal ranges overview create and use internal ranges network profiles for specific use cases overview rdma network profiles create a vpc network for rdma nics view network profiles access apis and services choose a private access option private service connect overview compatibility deployment patterns architecture security create and access your own service overview create a load balanced service make the service accessible to other vpc networks access the service from another vpc network service consumers endpoints published services about accessing published services access published services manage endpoints that access published services access published services through published service backends global google apis about accessing global google apis access global google apis regional google apis about accessing regional google apis access regional google apis about propagated connections backends about backends create a backend access published services access regional google apis access global google apis network attachments about network attachments create network attachments configure security service connection policies about service connectivity automation about service connection policies configure connectivity to services configure service connection policies deploy service instances manage consumer security service producers published services about published services about controlling access to published services publish services manage published services dns configuration for services service failover about composite health configure composite health for failover monitor composite health view update and delete composite health resources port mapping about port mapping create port mapping services update port mapping services migrate peering services to private service connect about migrating peering services migrate peering services interfaces about interfaces create interfaces configure routing configure security manage destination overlap manage producer security monitor connections private google access overview configure private google access private google access for on premises hosts overview configure private google access for on premises hosts access apis from vms with external ip addresses private services access overview configure private services access send serverless traffic to a vpc network overview configure serverless traffic monitor vpc flow logs overview about vpc flow logs records about traffic flows configure vpc flow logs configure organization policy constraints access flow logs audit logging vpc audit logging private services access audit logging serverless vpc access audit logging packet mirroring overview use packet mirroring monitor packet mirroring packet mirroring partner providers control access manage resources by using custom constraints create and manage tags for vpc resources troubleshoot troubleshoot internal connectivity between vms troubleshoot policy and access problems advanced topics advanced vpc concepts legacy networks overview manage legacy networks ai and ml application development application hosting compute data analytics and pipelines databases distributed hybrid and multicloud industry solutions migration networking observability and monitoring security storage access and resources management costs and usage management infrastructure as code sdk languages frameworks and tools home documentation networking virtual private cloud guides send feedback stay organized with collections save and categorize content based on your preferences alias ip ranges google cloud alias ip ranges let you assign ranges of internal ip addresses as aliases to a virtual machine s vm network interfaces this is useful if you have multiple services running on a vm and you want to assign each service a different ip address alias ip ranges also work with gke pods if you have only one service running on a vm you can reference it by using the interface s primary ip address if you have multiple services running on a vm you might want to assign each one a different internal ip address you can do this with alias ip ranges subnet primary and secondary cidr ranges all subnets with ipv4 address ranges have a primary cidr range which is the range of internal ip addresses that define the subnet each vm instance gets its primary internal ip address from this range you can also allocate alias ip ranges from that primary range or you can add a secondary range to the subnet and allocate alias ip ranges from the secondary range use of alias ip ranges does not require secondary subnet ranges these secondary subnet ranges merely provide an organizational tool alias ip ranges defined in a vm network interface using ip aliasing you can configure multiple internal ip addresses representing containers or applications hosted in a vm without having to define a separate network interface you can assign vm alias ip ranges from either the subnet s primary or secondary ranges configure alias ip ranges describes commands for setting up a subnet with secondary ranges and for assigning alias ip addresses to vms the following diagram provides a basic illustration of primary and secondary cidr ranges and vm alias ip ranges on the vm s primary interface primary and secondary cidr ranges and vm alias ip ranges click to enlarge a primary cidr range 10 1 0 0 16 is configured as part of a subnet a secondary cidr range 10 2 0 0 20 is configured as part of a subnet the vm primary ip 10 1 0 2 is allocated from the primary cidr range 10 1 0 0 16 while an alias ip range 10 2 1 0 24 is allocated in the vm from the secondary cidr range 10 2 0 0 20 the addresses in the alias ip range are used as the ip addresses of the containers hosted in the vm key benefits of alias ip ranges when alias ip ranges are configured google cloud automatically installs virtual private cloud vpc network routes for primary and alias ip ranges for the subnet of the primary network interface your container orchestrator does not need to specify vpc network connectivity for these routes this simplifies routing traffic and managing your containers you do need to perform in guest configuration as described in alias ip ranges key properties when container ip addresses are allocated by google cloud validation processes in google cloud ensure that container pod ip addresses do not conflict with vm ip addresses when alias ip addresses are configured anti spoofing checks are performed against traffic ensuring that traffic exiting vms uses vm ip addresses and pod ip addresses as source addresses the anti spoofing checks verify that vms do not send traffic with arbitrary source ip addresses use of static routes for container networking would be a less secure approach compared to ip aliasing because it would require anti spoofing checks to be disabled on container host vms anti spoofing checks are disabled when ip forwarding is enabled alias ip ranges are routable within the google cloud virtual network without requiring additional routes you do not have to add a route for every ip alias and you do not have to take route quotas into account alias ip addresses can be announced by cloud router to an on premises network connected via vpn or interconnect there are advantages to allocating alias ip ranges from a secondary cidr range by allocating from a range separate from the range used for primary ip addresses you can separate infrastructure vms from services containers when you configure separate address spaces for infrastructure and services you can set up firewall controls for vm alias ip addresses separately from the firewall controls for a vm s primary ip addresses for example you can allow certain traffic for container pods and deny similar traffic for the vm s primary ip address container architecture in google cloud consider a scenario in which you want to configure containerized services on top of google cloud you need to create the vms that will host the services and additionally the containers in this scenario you want to route traffic from and to the containers to and from on premises locations that are connected through a vpn however you don t want the primary vm ip addresses to be reachable through the vpn to create this configuration the container ip range needs to be routable through the vpn but not the vm primary ip range at vm creation time you also want to automatically assign a pool of ip addresses that are used for the container to create this configuration do the following when you create the subnet you configure one primary cidr range for example 10 128 0 0 16 one secondary cidr range for example 172 16 0 0 16 use an instance template to create vms and automatically assign each the following a primary ip from the 10 128 0 0 16 range an alias range 24 from the secondary cidr 172 16 0 0 16 space so that you can assign each container on a vm an ip from the 24 secondary cidr range create two firewall rules one rule that denies traffic traveling across the vpn from on premises from reaching the subnet primary cidr range one rule that allows traffic traveling across the vpn from on premises to reach the subnet secondary cidr range example configure containers with alias ip ranges using alias ip ranges container ip addresses can be allocated from a secondary cidr range and configured as alias ip addresses in the vm that is hosting the container configuring containers with alias ip addresses click to enlarge to create the configuration illustrated above create a subnet with a cidr range 10 128 0 0 16 from which vm ip addresses are allocated and a secondary cidr range 172 16 0 0 20 for the containers exclusive use which will be configured as alias ip ranges in the vm that is hosting them gcloud compute networks subnets create subnet a network network a range 10 128 0 0 16 secondary range container range 172 16 0 0 20 create vms with a primary ip from range 10 128 0 0 16 and an alias ip range 172 16 0 0 24 from the secondary cidr range 172 16 0 0 20 for the containers in that vm to use gcloud compute instances create vm1 network interface subnet subnet a aliases container range 172 16 0 0 24 gcloud compute instances create vm2 network interface subnet subnet a aliases container range 172 16 1 0 24 container ip addresses are configured in google cloud as alias ip addresses in this setup both primary and alias ips will be reachable through the vpn tunnel if cloud router is configured it will automatically advertise the secondary subnet range 172 16 0 0 20 for more information about the commands used to create this configuration see configure alias ip addresses and ranges example several alias ip ranges configured in a single vm instance alias ip ranges allow you to manage ip allocation for applications running within vms including with containers you may have a deployment in which some containers are migratable across vms and some are not the migratable containers can be configured using 32 ranges making it easy to migrate them individually the non migratable containers can be configured using a larger range since they will stay together in these type of deployments you might require more than one alias ip range per vm instance for example a 27 for non migratable containers and several 32s for migratable containers configuring vms with multiple alias ip ranges click to enlarge in order to configure this example use the following gcloud commands gcloud compute networks create vpc1 subnet mode custom gcloud compute networks subnets create subnet1 region us central1 network vpc1 range 10 128 0 0 16 secondary range secondaryrange1 172 16 0 0 20 gcloud compute instances create vm1 zone us central1 a network interface subnet subnet1 aliases secondaryrange1 172 16 0 0 27 secondaryrange1 172 16 1 0 32 gcloud compute instances create vm2 zone us central1 a network interface subnet subnet1 aliases secondaryrange1 172 16 0 32 27 secondaryrange1 172 16 1 1 32 alias ip addresses in auto mode vpc networks and subnets the automatically created subnets in auto mode vpc networks each have a primary cidr range but no secondary range to use alias ip with an auto mode vpc network you can allocate alias ip ranges from the automatically created subnet s primary cidr range or add a secondary range to the automatically created subnet and allocate alias ip ranges from the new secondary range alternatively you can create a new subnet with secondary ranges in the auto mode vpc network as long as none of its ranges overlap with 10 128 0 0 9 you can then create vm instances in the new subnet and allocate alias ip ranges from any range on that subnet if you want to add secondary ranges to your subnet see add secondary cidr ranges to an existing subnet alias ip addresses in custom mode networks and subnets in custom mode networks all of the subnets are created manually one primary cidr range is mandatory you can optionally create secondary cidr ranges alias ip ranges key properties the following properties apply to alias ip ranges configured in vms from the vm os perspective the primary ip address and the default gateway are typically allocated using dhcp alias ip addresses can be configured in the vm os which is typically linux or windows manually or by using scripts the primary ip address and the alias ip range of the interface must be allocated from cidr ranges configured as part of the same subnet note the following requirements the primary ip address must be allocated from the cidr primary range the alias ip range can be allocated either from the primary cidr range or from a secondary cidr range of that same subnet for a vm network interface ...