I'm trying to create a PowerShell script that checks if a specific network adapter can connect to the internet. Currently, I am using `(Get-NetConnectionProfile -InterfaceAlias "Ethernet").IPv4Connectivity`, but I want something more reliable, like an actual ping test or DNS resolution that uses a specific source IP or interface.
I've noticed that `Test-Connection` doesn't allow me to set a specific source address or interface. The `-Source` parameter is only for running commands on remote machines. When I tried it, I got misleading results.
Then there's `Test-NetConnection`, but it requires `-DiagnoseRouting` and seems to lack a real connection test, which isn't useful for what I need.
I even considered using `[System.Net.NetworkingInformation.Ping]`, but that also doesn't support source address constraints. I've looked around and even worked on a "ping wrapper" for PowerShell that uses `ping.exe`, but parsing the output is a hassle since different OS versions give different results.
Ultimately, I want to be able to verify connectivity on adapter A and disable adapter B if the connection is fine. If not, I should enable adapter B, as Windows often makes its own decisions about network connections, ignoring the metrics I've set up.
4 Answers
While `ping.exe` can take a `-S` parameter for source IP, it doesn't provide a detailed output for your needs. You might want to look into using `Win32_PingStatus` with `Get-CimInstance` for better results. Also, if you're looking to trace routes, that's another way to go rather than relying solely on pinging.
It seems there's some confusion about how Windows networking operates. You can't specifically constrain a ping to just one adapter without more complex routing configurations. Ideally, you want to manage metrics effectively, and consider using a firewall or load balancer for better control over which network traffic goes where.
Right? It's all about setting those metrics properly! A load balancer definitely makes a lot of these tasks easier.
Just a heads up, only one adapter can effectively reach the internet at a time, usually the one set as the default route. If multiple adapters have the same metrics, it can lead to unpredictable routing behavior. Changing the default route to another adapter could help rather than disabling one outright.
It sounds like you're dealing with dual NICs. If that's the case, have you thought about adjusting the interface metrics? It might help in prioritizing the connections. Also, using `Get-NetRoute` could clarify which adapter is currently being used for internet access. Just a thought!
That's right! Adjusting the metrics is crucial when dealing with multiple adapters. It helps Windows know which route to prefer.
Exactly! Combining ping with `Win32_PingStatus` can give more info about your network status and help in diagnostics.