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The egress traffic originates from a private network to a public network, such as the Internet. By default, the egress traffic is blocked in default network offerings, so no outgoing traffic is allowed from a guest network to the Internet. However, you can control the egress traffic in an Advanced zone by creating egress firewall rules. When an egress firewall rule is applied, the traffic specific to the rule is allowed and the remaining traffic is blocked. When all the firewall rules are removed the default policy, Block, is applied.

Consider the following scenarios to apply egress firewall rules: Egress firewall rules are supported on Juniper SRX and virtual router. The egress firewall rules are not supported on shared networks. Allow the egress traffic from specified source CIDR. The Source CIDR is part of guest network CIDR. Allow the egress traffic with protocol TCP,UDP,ICMP, or ALL. Allow the egress traffic with protocol and destination port range. The port range is specified for TCP, UDP or for ICMP type and code. The default policy is Allow for the new network offerings, whereas on upgrade existing network offerings with firewall service providers will have the default egress policy Deny.

Log in to the &PRODUCT; UI as an administrator or end user. In the left navigation, choose Network. In Select view, choose Guest networks, then click the Guest network you want. To add an egress rule, click the Egress rules tab and fill out the following fields to specify what type of traffic is allowed to be sent out of VM instances in this guest network: egress-firewall-rule.png: adding an egress firewall rule CIDR: (Add by CIDR only) To send traffic only to the IP addresses within a particular address block, enter a CIDR or a comma-separated list of CIDRs. The CIDR is the base IP address of the destination. For example, 192.168.0.0/22. To allow all CIDRs, set to 0.0.0.0/0. Protocol: The networking protocol that VMs uses to send outgoing traffic. The TCP and UDP protocols are typically used for data exchange and end-user communications. The ICMP protocol is typically used to send error messages or network monitoring data. Start Port, End Port: (TCP, UDP only) A range of listening ports that are the destination for the outgoing traffic. If you are opening a single port, use the same number in both fields. ICMP Type, ICMP Code: (ICMP only) The type of message and error code that are sent. Click Add.

You can configure the default policy of egress firewall rules in Isolated Advanced networks. Use the create network offering option to determine whether the default policy should be block or allow all the traffic to the public network from a guest network. If no policy is specified, by default all the traffic is allowed from the guest network that you create by using this network offering. You have two options: Allow and Deny. If you select Allow for a network offering, by default egress traffic is allowed. However, when an egress rule is configured for a guest network, rules are applied to block the specified traffic and rest are allowed. If no egress rules are configured for the network, egress traffic is accepted. If you select Deny for a network offering, by default egress traffic for the guest network is blocked. However, when an egress rules is configured for a guest network, rules are applied to allow the specified traffic. While implementing a guest network, &PRODUCT; adds the firewall egress rule specific to the default egress policy for the guest network. This feature is supported only on virtual router and Juniper SRX. Create a network offering with your desirable default egress policy: Log in with admin privileges to the &PRODUCT; UI. In the left navigation bar, click Service Offerings. In Select Offering, choose Network Offering. Click Add Network Offering. In the dialog, make necessary choices, including firewall provider. In the Default egress policy field, specify the behaviour. Click OK. Create an isolated network by using this network offering. Based on your selection, the network will have the egress public traffic blocked or allowed.