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ing cloud vpn tunnels vpc firewall rules are stateful when a connection is allowed through the firewall in either direction return traffic matching this connection is also allowed you cannot configure a firewall rule to deny associated response traffic return traffic must match the 5 tuple source ip destination ip source port destination port protocol of the accepted request traffic but with the source and destination addresses and ports reversed google cloud associates incoming packets with corresponding outbound packets by using a connection tracking table ipv4 connections support tcp udp sctp and icmp protocols ipv6 connections support tcp udp sctp and icmpv6 protocols google cloud implements connection tracking regardless of whether the protocol supports connections if a connection is allowed between a source and a target for an ingress rule or between a target and a destination for an egress rule all response traffic is allowed as long as the firewall s connection tracking state is active a firewall rule s tracking state is considered active if at least one packet is sent every 10 minutes when a fragmented connection is allowed through the firewall google cloud uses connection tracking to allow only the first fragment of return traffic to allow subsequent return fragments you must add a firewall rule icmp response traffic such as icmp type 3 destination unreachable generated in response to an allowed tcp udp connection is allowed through the firewall this behavior is consistent with rfc 792 vpc firewall rules do not reassemble fragmented tcp packets therefore a firewall rule applicable to the tcp protocol can only apply to the first fragment because it contains the tcp header firewall rules applicable to the tcp protocol do not apply to the subsequent tcp fragments the maximum number of tracked connections in the firewall rule table depends on the number of stateful connections supported by the machine type of the instance if the maximum number of tracked connections is exceeded tracking is stopped for the connections that have the longest idle interval to let new connections be tracked instance machine type maximum number of stateful connections shared core machine types 130 000 instances with 1 8 vcpus 130 000 connections per vcpu instances with more than 8 vcpus 1 040 000 130 000 8 connections total implied actions if no vpc firewall rule applies to a target the firewall rule evaluation process might reach the last step at this step cloud ngfw uses an implied action the implied action depends on the traffic direction and the target resource type for more information see firewall rule evaluation process pre populated rules in the default network the default network is pre populated with firewall rules that allow incoming connections to instances these rules can be deleted or modified as necessary rule name direction priority source ranges action protocols and ports description default allow internal ingress 65534 10 128 0 0 9 allow tcp 0 65535 udp 0 65535 icmp permits incoming connections to vm instances from other instances within the same vpc network default allow ssh ingress 65534 0 0 0 0 0 allow tcp 22 lets you connect to instances with tools such as ssh scp or sftp default allow rdp ingress 65534 0 0 0 0 0 allow tcp 3389 lets you connect to instances using the microsoft remote desktop protocol rdp default allow icmp ingress 65534 0 0 0 0 0 allow icmp lets you use tools such as ping you can create similar firewall rules for networks other than the default network see configure firewall rules for common use cases for more information blocked and limited traffic separate from vpc firewall rules and hierarchical firewall policies google cloud blocks or limits certain traffic as described in the following table traffic type details packet rate and bandwidth applies to all egress packets all ingress packets google cloud accounts for bandwidth per vm instance for each network interface nic or ip address a vm s machine type defines its maximum possible egress rate however you can only achieve that maximum possible egress rate in specific situations for details see network bandwidth in the compute engine documentation dhcp offers and acknowledgments applies to ingress packets to udp port 68 dhcpv4 ingress packets to udp port 546 dhcpv6 google cloud blocks incoming dhcp offers and acknowledgments from all sources except for dhcp packets coming from the metadata server protocols supported by google cloud external ip addresses applies to ingress packets to external ip addresses external ipv4 and ipv6 addresses only accept tcp udp icmp ipip ah esp sctp and gre packets resources that use external ip addresses impose additional protocol restrictions forwarding rules for protocol forwarding external application load balancers external proxy network load balancers and external passthrough network load balancers only process the protocols and ports configured on the forwarding rule cloud vpn gateways only accept vpn protocols smtp port 25 traffic applies to egress packets to external ip addresses on tcp port 25 to help prevent spam by default google cloud blocks egress packets sent to tcp destination port 25 of an external ip address including an external ip address of another google cloud resource google cloud automatically removes this block once it determines a project is at low risk of sending large volumes of email over unencrypted connections google cloud excludes smtp traffic over tls on port 465 or 587 from this block to find out if your project permits this traffic go to the vpc networks page or the firewall policies page in the google cloud console a banner message on both pages indicates whether your project permits this traffic for more information contact a google cloud sales specialist this block does not apply to egress packets sent to tcp destination port 25 of an internal ip address including a privately used public ip address in a vpc network or an on premises network if external smtp egress on port 25 is allowed in your project and you want to send this type of traffic the following additional conditions must be met egress firewall rules in the vpc network and hierarchical firewall policies applicable to the vpc network must allow egress to the external ip address on tcp port 25 the implied allow egress rules meet this requirement because they allow egress to and established inbound responses from any ip address the applicable route for the destination must use the default internet gateway next hop the system generated default routes meet this requirement the instance sending packets to the external ip address must meet the internet access requirements you can prevent external smtp egress by creating egress deny vpc firewall rules or hierarchical firewall policies always allowed traffic for vm instances vpc firewall rules and hierarchical firewall policies do not apply to the following packets sent to and received from the google cloud metadata server packets sent to an ip address assigned to one of the instance s own network interfaces nics where packets stay within the vm itself ip addresses assigned to an instance s nic include the primary internal ipv4 address of the nic any internal ipv4 address from an alias ip range of the nic if ipv6 is configured on the subnet any of the ipv6 addresses assigned to the nic an internal or external ipv4 address associated with a forwarding rule for load balancing or protocol forwarding if the instance is a backend for the load balancer or is a target instance for protocol forwarding loopback addresses addresses configured as part of networking overlay software you run within the instance itself google cloud metadata server google cloud runs a local metadata server alongside each instance the server is accessible at 169 254 169 254 for ipv4 and fd20 ce 254 for ipv6 this server is essential to the operation of the instance so the instance can access it regardless of any firewall rules that you configure the metadata server provides the following basic services to the instance dhcp dns resolution following the dns name resolution order for the vpc network instance metadata network time protocol ntp product interactions the following sections describe how firewall rules and hierarchical firewall policies interact with other google cloud products firewall rules and passthrough load balancers vpc firewall rules and hierarchical firewall policies do control which of the forwarding rule s supported protocols and ports are allowed to access the passthrough load balancer s backends for details see firewall rules in the external passthrough network load balancer documentation firewall rules in the internal passthrough network load balancer documentation firewall rules and proxy load balancers for external application load balancers internal application load balancers internal proxy network load balancers and external proxy network load balancers vpc firewall rules and hierarchical firewall policies do not control which protocols and ports are accepted by the proxy load balancer s forwarding rule ip address the forwarding rule alone determines which protocols and ports are accepted by the proxy load balancer vpc firewall rules and hierarchical firewall policies do control how these proxy load balancers communicate to their backends for details see firewall rules in the external application load balancer documentation firewall rules in the internal application load balancer documentation firewall rules in the internal proxy network load balancer documentation firewall rules in the external proxy network load balancer documentation firewall rules and cloud vpn firewall rules and hierarchical firewall policies do not control which protocols and ports are accepted by the cloud vpn gateway cloud vpn gateways only accept packets for the protocols and ports described in the cloud vpn specifications firewall rules and gke google kubernetes engine creates and manages firewall rules automatically when you create a cluster or resources in the cluster including services and ingresses for more information see automatically created firewall rules in the google kubernetes engine documentation firewall rules and ai hypercomputer you can create vpc firewall rules when you create the vpc networks required for creating vms in ai hypercomputer use the firewall rules to specify the protocols and ports that are allowed for your vpc networks for more information see ai hypercomputer overview firewall rule components each firewall rule consists of the following configuration components a direction from the perspective of the target direction can be either ingress or egress a numerical priority which determines whether the rule is applied only the highest priority lowest priority number rule whose other components match traffic is applied conflicting rules with lower priorities are ignored an action on match either allow or deny which determines whether the rule permits or blocks connections the enforcement status of the firewall rule you can enable and disable firewall rules without deleting them a target which defines the instances including gke clusters and app engine flexible environment instances to which the rule applies a source or destination filter for packet characteristics the protocol such as tcp udp or icmp and destination port a boolean logs option which logs connections that match the rule into cloud logging components summary ingress inbound rule priority action enforcement target parameter source and destination filters protocols and ports integer from 0 to 65535 inclusive default 1000 allow or deny enabled default or disabled specifies the instances that receive packets sources for ingress rules destinations for ingress rules specify a protocol or a protocol and a destination port if not set the rule applies to all protocols and destination ports for more information see protocols and ports egress outbound rule priority action enforcement target parameter source and destination filters protocols and ports integer from 0 to 65535 inclusive default 1000 allow or deny enabled default or disabled specifies the instances that send packets sources for egress rules destinations for egress rules specify a protocol or a protocol and a destination port if not set the rule applies to all protocols and destination ports for more information see protocols and ports direction of traffic you can create firewall rules that apply to ingress or egress traffic a single rule cannot apply to both ingress and egress traffic however you can create multiple rules to define the ingress and egress traffic that you allow or deny through the firewall ingress inbound describes packets entering a network interface of a target egress outbound describes packets leaving a network interface of a target if you don t specify a direction google cloud uses ingress priority the priority of a vpc firewall rule is similar to the priority of a rule in a firewall policy with the following differences feature firewall policy rule vpc firewall rule range 0 to 2 147 483 547 0 to 65 535 default priority number none 1000 default uniqueness must be unique within the policy can be shared across rules the relative priority of a firewall rule determines whether it is applicable when evaluated against others the evaluation logic works as follows the highest priority rule applicable to a target for a given type of traffic takes precedence target specificity does not matter for example a higher priority ingress rule for certain destination ports and protocols intended for all targets overrides a similarly defined rule with lower priority for the same destination ports and protocols intended for specific targets the highest priority rule applicable for a given protocol and destination port definition takes precedence even when the protocol and destination port definition is more general for example a higher priority ingress rule allowing traffic for all protocols and destination ports intended for given targets overrides a lower priority ingress rule denying tcp 22 for the same targets a rule with a deny action overrides another with an allow action only if the two rules have the same priority using relative priorities it is possible to build allow rules that override deny rules and deny rules that override allow rules rules with the same priority and the same action have the same result however the rule that is used during the evaluation is indeterminate normally it doesn t matter which rule is used except when you enable vpc firewall rules logging if you want your logs to show firewall rules being evaluated in a consistent and well defined order assign them unique priorities consider the following example where two firewall rules exist an ingress rule from sources 0 0 0 0 0 any ipv4 address applicable to all targets all protocols and all destination ports having a deny action and a priority of 1000 an ingress rule from sources 0 0...