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overview get started vpc networks subnets ipv6 support create and manage vpc networks add networking features add ip addresses overview reserve internal ip addresses reserve external ip addresses move an external ipv4 address to a different 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 maximum transmission unit the maximum transmission unit mtu is the size in bytes of the largest possible ip packet including ip headers layer 4 protocol headers and layer 4 data that can fit inside an ethernet frame valid vpc network mtu sizes virtual private cloud vpc networks use a default mtu of 1 460 bytes you can set a vpc network s mtu to any value between 1 300 bytes and 8 896 bytes inclusive common custom mtu sizes are 1 500 bytes standard ethernet or 8 896 bytes the maximum possible we recommend that you configure the mtu for each compute engine instance network interface nic to match the mtu of the vpc network to which it is connected for more information see compute instances and mtu settings note if you create a vpc network with a network profile provided by google cloud for a specific use case the default mtu might be different for more information see the documentation for the specific network profile communication between compute instances within vpc networks ip packets up to the mtu size can be sent between two compute instances if the following apply both the sending and receiving instances use the same vpc network or peered vpc networks that have identical mtus the interfaces for both instances are configured to use the vpc network mtu to avoid mtu mismatch issues we recommend that you use the same mtu for all of your connected vpc networks although that is the recommended practice you are not forced to configure identical mtus on connected vpc networks for details about how protocols handle situations where there is a mtu mismatch between vpc networks see mismatched mtus mss clamping path mtu discovery from the perspective of a sending instance paths to the following destinations represent instance to instance traffic routed within a vpc network a regional internal ipv4 address in a subnet primary ipv4 or subnet secondary ipv4 address range including private ipv4 address ranges and privately used public ipv4 address ranges used by these destination resources the primary internal ipv4 address of a receiving instance s network interface nic an internal ipv4 address in an alias ip range of a receiving instance s nic an internal ipv4 address of an internal forwarding rule for either protocol forwarding or for an internal passthrough network load balancer internal ipv6 subnet address ranges used by these destination resources an ipv6 address from the 96 ipv6 address range assigned to a receiving instance s nic an ipv6 address from the 96 ipv6 address range of an internal forwarding rule for either protocol forwarding or for an internal passthrough network load balancer external ipv6 subnet address ranges used by these destination resources when packets are routed using subnet routes or peering subnet routes within the vpc network an ipv6 address from the 96 ipv6 address range assigned to a receiving instance s nic an ipv6 address from the 96 ipv6 address range of an external forwarding rule for either protocol forwarding or for an external passthrough network load balancer the following instance to instance paths are treated in the same way as communication to destinations outside of a vpc network if the packet destination is an external ipv4 address of a receiving instance s nic if the packet destination is an external ipv4 address of an external passthrough network load balancer if the packet destination is an external ipv4 address of a forwarding rule for protocol forwarding if the packet destination is an external ipv6 address of an instance s nic external passthrough network load balancer or forwarding rule for external protocol forwarding and the applicable route in the vpc network uses a default internet gateway next hop in this scenario receiving instances are neither in the same vpc network as the sending instance nor in a vpc network connected to the sending instance s vpc network using vpc network peering communication to destinations outside of a vpc network google cloud processes packets sent from compute instances to destinations outside of the sending instance s vpc network as shown in the following table destinations outside of a sending instance s vpc network include publicly routable ip addresses for resources outside of google cloud and customer usable external ip addresses within google cloud important if a destination ipv6 address for a compute instance nic or forwarding rule for an external passthrough network load balancer or external protocol forwarding is in the sending instance s own vpc network or a peered vpc see communication between compute instances within vpc networks instead because the internet generally uses an mtu of 1 500 bytes keeping ip packet size at 1 500 bytes or less usually avoids mtu related packet loss situation behavior tcp syn and syn ack packets google cloud performs mss clamping if necessary changing the mss to ensure packets fits within the mtu ip packet mtu between 1 300 bytes and 1 600 bytes inclusive google cloud makes no changes to the packet except for syn and syn ack packets as discussed in the first row ip packet larger than 1 600 bytes google cloud drops the packet and sends a fragmentation needed icmp over ipv4 or packet too big icmpv6 message both when the df bit is on and also when the df bit is off communication to google apis and services compute instances using any valid vpc network mtu size can send packets to google apis and services including using private google access and private service connect for google apis the details in this section also apply to on premises resources that send packets to google apis and services using private google access for on premises hosts the traffic path to google apis and services described in this section is implemented by google front ends gfes these gfes use non configurable fixed mtus traffic from google cloud to google apis and services always uses the tcp protocol if a compute instance connects to google apis and services from a vpc network whose mtu doesn t match the mtu of the gfe the segment size is negotiated by using tcp mss advertisement as described in mismatched mtus mss clamping path mtu discovery packet source packet destination any internal ipv4 address primary internal ipv4 address or internal ipv4 address from an alias ip range of the instance nic an external ipv4 address assigned to the instance nic using a 1 1 nat access config in this situation google cloud performs 1 1 nat on egress converting an original source primary internal ipv4 address to a source external ipv4 address specified in the access config google apis and services ipv4 addresses for the default domains 199 36 153 4 30 restricted googleapis com 199 36 153 8 30 private googleapis com private service connect endpoint for google apis and services external or internal ipv6 address for dual stack or ipv6 only instances google apis and services ipv6 addresses for the default domains 2600 2d00 0002 1000 56 restricted googleapis com 2600 2d00 0002 2000 56 private googleapis com communication through cloud vpn tunnels cloud vpn has both a gateway mtu for encapsulated packets and a payload mtu for packets before and after encapsulation for precise payload mtu values and other cloud vpn mtu information see mtu considerations in the cloud vpn documentation communication through cloud interconnect vlan attachments we recommend that you use the same mtu for all vlan attachments that are connected to the same vpc network and that you set the mtu of the vpc network to the same value for details about cloud interconnect vlan attachment mtus see cloud interconnect mtu communication through firewall endpoints if you use firewall endpoints configure an appropriate mtu for your vpc network if the mtu setting of your vpc network exceeds the packet size that your firewall endpoint supports cloud next generation firewall can t perform layer 7 inspection successfully for more information see supported packet size jumbo frame support jumbo frames have a payload more than 1 460 bytes in size the following table summarizes jumbo frame support for google cloud products and features product or feature jumbo frame support compute engine yes cloud interconnect yes firewall endpoints yes cloud vpn no google apis no compute instances and mtu settings as a best practice match a compute instance nic s mtu to the mtu of the vpc network that the nic is connected to the nic mtu configuration varies depending on the operating system and configuration linux instances based on a public os image each nic mtu is automatically set to the respective vpc network mtu by using dhcp option 26 windows instances based on a public os image by default each nic mtu is configured with a fixed mtu of 1 460 bytes if you change the mtu of a vpc network that contains windows instances based on public os images you must change the mtu setting of the windows instances custom guest os images you must configure nic mtus or verify that the guest os accepts the vpc network mtu by using dhcp option 26 instances with multiple network interfaces set each nic mtu to the respective vpc network mtu if a nic mtu must differ from the vpc network mtu set the nic mtu to a value that s less than the vpc network mtu forcibly decreasing the nic mtu is advantageous for some advanced networking scenarios changing the mtu of a vpc network to avoid connectivity issues before you change the vpc network mtu you must first stop each compute instance rebooting an instance from within its guest operating system doesn t update its mtu if you choose to configure instances with a lower mtu than the network mtu the requirement to stop the instance before changing the mtu still applies for more information about changing the network mtu see change the mtu setting of a vpc network gke and mtu settings the mtu selected for a pod interface is dep...
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