StaticAndSubnet

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I suspect by StaticIp address you mean a Public IP address. To get this to work efficiently, you need to point the Public IP address (Internet Address) into a Static IP address in the mesh. Each IP address is unique within a mesh, based on the CellId. Therefore, if the client has a static IP address, he will be stuck with communicating with the node in the same subnet, thus he should not be able communicate at IP level with any other node.

Local Static IP (192.168.x.x)
If you assign a client a static IP, can they still roam to another AP in their vacinity? I know they will not have internet, but will a static IP keep someone from switching AP's?

At the lower level (MAC) it does not lock him to an AP.

If a stronger signal on the same SSID comes along, then the client will switch to the stronger signal, which can be frustrating, particularly if the user flips between two nodes of broadly equal signal strength, as they get issued a new IP address each time if they are on DHCP, which means short periods of no access. Setting the Client Roaming to Manual helps alleviate this problem, as does careful choice and positioning of antenna, but when the computer is first switched on, you do not have control over which node to connect to on Windows.

Naturally, if the client flips to another node, with a static IP address, then he will lose connectivity.

I seem to remember a posting many months ago, whereby a mesh operator was putting all his nodes on different SSID's so that the client could decide which one to connect to, then using the Mesh with any SSID to make the mesh work, however this brings in a whole other set of issues.

Sorry, I should have clarified more. No Public static ip involved. Only want to know if this locks him to AP?

If you assign a client a static IP, can they still roam to another AP in their vacinity? I know they will not have internet, but will a static IP keep someone from switching AP's?