# Networking with Powershell

## Test-Connection

Similar to ping

```powershell
Test-Connection udemy.com
# Multiple Connexion
Test-Connection -ComputerName 8.8.8.8, 8.8.4.4
#  Add Delay between ping attempt
Test-Connection -ComputerName 8.8.8.8, 8.8.4.4 -Delay 5
#  Number of ping attempts
Test-Connection -ComputerName 8.8.8.8, 8.8.4.4 -Delay 5 - Count 2
```

## Test-NetConnection

similar to test net-Connections but better output

```powershell
Test-NetConnection udemy.com

Test-NetConnection udemy.com -InfomationLevel "Detailed"

#Populate a variable

$test = Test-NetConnection udemy.com -InfomationLevel "Detailed"
$test.PingReplyDetailed
```

### TraceRoute

```powershell
$test = Test-NetConnection udemy.com -TraceRoute
# Limit traceroute to 3 hops
$test = Test-NetConnection udemy.com -TraceRoute -Hops 3
```

### Portscan

```powershell
Test-NetConnection wikipedia.org -CommonTCPPort "http"

Test-NetConnection wikipedia.org -Port 80
Test-NetConnection wikipedia.org -Port 21

$ports = 22,80

$ports | forEach-Object {$port = $PSItem; if(Test-NetConnection udemy.com -Port $port -InformationLevel Quiet -WarningAction SilentlyContinue){Write-Host "Hey, $port is open !"} else { Write-Host "Hey, $port is closed ! "}}
```

## Get-NetAdapter

To see the network adapter of the machine

```powershell
Get-NetAdapter 

#nicer view
Get-NetAdapter | Format-List

$netAdapter = Get-NetAdapter
$netAdapter.MacAddress
```

## Get-NetIPConfiguration

To access ip address of the machine

```powershell
Get-NetIPConfiguration

$ipinfo = Get-NetIPConfiguration

$ipinfo[0].IPv4Address
```

## Resolve-DnsName

```powershell

Resolve-DnsName udemy.com

Resolve-DnsName udemy.com | Format-List

```

## Get-DnsClientServerAddress 

```powershell
Get-DnsClientServerAddress -InterfaceAlias Ethernet
$dnsserv = Get-DnsClientServerAddress -InterfaceAlias Ethernet
$dnserv[0].ServerAddresses
```

## Clear-DnsClientCache

The **Clear-DnsClientCache** cmdlet clears the local DNS resolver 
cache on a Windows system. 
This forces the computer to request fresh DNS information from 
its configured DNS servers, which is useful for troubleshooting 
name resolution issues or testing DNS changes. 
The cmdlet requires administrative privileges and only affects the local machine.

```powershell
Clear-DnsClientCache
```