While rules for the internal side prescribe ports that should be opened between the internal user and Skype for Business 2015 server subnets and the internal side of the Edge. Rules for the external side prescribe ports that should be opened between the Internet and the external side of the Edge. The required firewall rules are split up between those for the external side of the Edge server and those for the internal side.You also need four (4) IP addresses, one (1) on the internal NIC and its subnet and the remaining three (3) on the external side NIC(s) and their subnet.On a four (4) NIC Edge you would have one (1) NIC on the internal side and the remaining three (3) on the external side. One of the subnets is defined as being connected to the internal side of the Edge with the other connected to the external side. On a 2 NIC Edge, each one of the NICs has to be connected to a separate subnet.The Edge server has to have two (2) network interface cards (NIC), four (4) is better but two (2) works fine!.These additional IP addresses are used for the Edge’s virtual IP addresses (VIPs) If you use Hardware Load Balancing, you will need three (3) more Public IP addresses above those you have pulled for the Edge servers themselves. It is true in a multiple Edge server Edge pool whether you choose to use DNS Load Balancing or Hardware Load Balancing. This is true whether you have a single Edge server or multiple Edge servers. You need to assign three (3) Public IP addresses for each Edge server.If you’ve worked with OCS, Lync 2010, Lync 2013 or Skype for Business 2015 you are aware that there are some cardinal rules when installing an Edge server in a supported configuration and following Best Practices: I am not going to go into any kind of depth as to why this is a problem, just going to explain what it is and offer some advice on how to resolve it. This is going to be a brief to the point posting about a configuration issue we’ve been seeing a lot of recently. *Re-posting this article since we have recently had several inquiries about this topic!
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