MS Forefront Threat Management Gateway Enterprise Edition 2010 mac

NLB is a MS Forefront Threat Management Gateway Enterprise Edition 2010 mac, yet highly effective solution to provide redundancy for network traffic handled by a TMG array. NLB also enables flexible scalability by making it easy to add nodes to an array to participate in load sharing of network communication. NLB is fundamentally a component of the operating system which Forefront TMG manages for its purposes, and is configured and managed primarily with the Forefront TMG management console.

TMG integrates tightly with Windows NLB and includes additional intelligence to manage load balancing in the event an array member is unable to process traffic. In addition to the load balancing and scalability benefits that NLB provides, NLB also improves availability by allowing for node maintenance or rolling upgrades while maintaining system uptime. When performing updates, a node can be removed from the load-balanced cluster and returned to the array once it has been serviced.

During this time, the other nodes in the array remain online to service production traffic. Configuring and enabling NLB is quick and easy, and integrates seamlessly in to any network environment as it requires no hardware changes to deploy. NLB vs. Although round-robin DNS is even simpler to configure than NLB, it lacks the necessary intelligence to determine if a node is online and able to service requests.

If a node is offline, it is entirely possible, and indeed quite likely, that a client will attempt to send MS Forefront Threat Management Gateway Enterprise Edition 2010 mac request to an offline node.

This can result in serious delays and potential connectivity failure. By contrast, NLB maintains availability awareness for all cluster nodes through the use of a cluster heartbeat. If a node is offline, no traffic will be delivered to that host.

NLB also prevents the switch from learning this MAC address, which forces the switch to deliver the frame to all switch ports. This induces switch flooding by design, and ensures that all nodes in the NLB cluster receive traffic destined for the VIP. NLB logic then determines which node will process the request, and the remaining nodes then silently discard the frame. NLB keeps track of which nodes are online through the use of layer 2 broadcast heartbeats. These heartbeats occur every second, and if a node fails to respond after 5 seconds it is assumed to be offline and no traffic will be delivered to that node until it returns to service.

To accommodate this, TMG-integrated NLB is configured in single affinity mode to ensure that network sessions are always handled by the same array member. Figure 1 Network Load Balancing is configured on a per-network basis. This IP address must be on the same subnet as the dedicated IP address. Optionally you can choose to add additional VIPs if required.

Leave the Cluster operation mode at the default setting of Unicast for now. Click Ok, then apply the changes. Figure 3 Once the configuration has been synchronized and the TMG services restarted, each node in the array will have its original MAC address overwritten with the cluster MAC address.

Again, this is by design. Figure 6 You MS Forefront Threat Management Gateway Enterprise Edition 2010 mac see this behavior by monitoring the network traffic with a protocol analyzer. Forefront TMG also supports multicast mode.

The issue with the multicast operating mode is that ARP requests for the unicast VIP result in a reply from a multicast MAC address, which many routers and layer 3 switches refuse to accept.

Use caution when selecting this mode as IGMP snooping can consume a lot of resources on the switch. Recommendations and Best Practices The generally accepted guidance for MS Forefront Threat Management Gateway Enterprise Edition 2010 mac a cluster operation mode is to keep the default unicast mode setting unless you have a specific reason to change it.

To ensure that the same array member always handles the correct network traffic, it is recommended to enable NLB on all networks with the exception of the intra-array network, if used. Web proxy clients can be configured to use the VIP to deliver requests to the array, but additional configuration will be required to leverage Kerberos authentication in this scenario.

You can read more about enabling Kerberos authentication in load balanced scenarios here. Machines with the Firewall Client installed can only leverage DNS round robin to provide high availability. For more information regarding high availability for the Firewall Client, click here. It can be leveraged to provide essential redundancy and improve system uptime and can be MS Forefront Threat Management Gateway Enterprise Edition 2010 mac without having to make changes to the underlying network infrastructure.

NLB has several operating modes that can be used to tune network behavior based on your requirements. Although unicast mode is fine for most deployments, multicast operations modes can be used to address concerns caused by switch flooding. Post Views:

MS Forefront Threat Management Gateway Enterprise Edition 2010 mac

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