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# SCNetworkReachabilityFlags

Flags that indicate the reachability of a network node name or address, including whether a connection is required, and whether some user intervention might be required when establishing a connection.

```
struct SCNetworkReachabilityFlags
```

## Topics

### Constants

[`transientConnection`](/documentation/SystemConfiguration/SCNetworkReachabilityFlags/transientConnection)

The specified node name or address can be reached via a transient connection, such as PPP.

[`reachable`](/documentation/SystemConfiguration/SCNetworkReachabilityFlags/reachable)

The specified node name or address can be reached using the current network configuration.

[`connectionRequired`](/documentation/SystemConfiguration/SCNetworkReachabilityFlags/connectionRequired)

The specified node name or address can be reached using the current network configuration, but a connection must first be established. If this flag is set, the `kSCNetworkReachabilityFlagsConnectionOnTraffic` flag, `kSCNetworkReachabilityFlagsConnectionOnDemand` flag, or `kSCNetworkReachabilityFlagsIsWWAN` flag is also typically set to indicate the type of connection required. If the user must manually make the connection, the `kSCNetworkReachabilityFlagsInterventionRequired` flag is also set.

[`connectionOnTraffic`](/documentation/SystemConfiguration/SCNetworkReachabilityFlags/connectionOnTraffic)

The specified node name or address can be reached using the current network configuration, but a connection must first be established. Any traffic directed to the specified name or address will initiate the connection.

[`interventionRequired`](/documentation/SystemConfiguration/SCNetworkReachabilityFlags/interventionRequired)

The specified node name or address can be reached using the current network configuration, but a connection must first be established.

[`connectionOnDemand`](/documentation/SystemConfiguration/SCNetworkReachabilityFlags/connectionOnDemand)

The specified node name or address can be reached using the current network configuration, but a connection must first be established.

[`isLocalAddress`](/documentation/SystemConfiguration/SCNetworkReachabilityFlags/isLocalAddress)

The specified node name or address is one that is associated with a network interface on the current system.

[`isDirect`](/documentation/SystemConfiguration/SCNetworkReachabilityFlags/isDirect)

Network traffic to the specified node name or address will not go through a gateway, but is routed directly to one of the interfaces in the system.

[`isWWAN`](/documentation/SystemConfiguration/SCNetworkReachabilityFlags/isWWAN)

The specified node name or address can be reached via a cellular connection, such as EDGE or GPRS.

[`connectionAutomatic`](/documentation/SystemConfiguration/SCNetworkReachabilityFlags/connectionAutomatic)

The specified node name or address can be reached using the current network configuration, but a connection must first be established. Any traffic directed to the specified name or address will initiate the connection. This flag is a synonym for [`connectionOnTraffic`](/documentation/SystemConfiguration/SCNetworkReachabilityFlags/connectionOnTraffic).


---

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