iOS8管理VPN服务

NEVPNManager *manager = [NEVPNManager sharedManager];

[manager loadFromPreferencesWithCompletionHandler:^(NSError *error) {
    if(error) {
        NSLog(@"Load error: %@", error);
    } else {
        // No errors! The rest of your codes goes here...
    }
}];

//添加IPSec协议连接
NEVPNProtocolIPSec *p = [[NEVPNProtocolIPSec alloc] init];
p.username = @"[Your username]";
p.passwordReference = [VPN user password from keychain];
p.serverAddress = @"[Your server address]";
p.authenticationMethod = NEVPNIKEAuthenticationMethodSharedSecret;
p.sharedSecretReference = [VPN server shared secret from keychain];
p.localIdentifier = @"[VPN local identifier]";
p.remoteIdentifier = @"[VPN remote identifier]";
p.useExtendedAuthentication = YES;
p.disconnectOnSleep = NO;

//On-demand 这里可以设置规则，哪些网络连接使用此vpn（http://www.derman.com/blogs/Example-iOS-VPN-OnDemand-Rules）
[[NEVPNManager sharedManager] setOnDemandEnabled:YES];
NSMutableArray *rules = [[NSMutableArray alloc] init];
NEOnDemandRuleConnect *connectRule = [NEOnDemandRuleConnect new];
[rules addObject:connectRule];
[[NEVPNManager sharedManager] setOnDemandRules:array];


//设置vpn名字
[manager setLocalizedDescription:@"[You VPN configuration name]"];

//保存设置
[manager saveToPreferencesWithCompletionHandler:^(NSError*error) {
    if(error) {
        NSLog(@"Save error: %@", error);
    }
    else {
        NSLog(@"Saved!");
    }
  }];
 
//连接到vpn
NSError *startError;
[[NEVPNManager sharedManager].connection startVPNTunnelAndReturnError:&startError];
     
if(startError) {
    NSLog(@"Start error: %@", startError.localizedDescription);
} else {
    NSLog(@"Connection established!");
}