public static bool IsValidNetmask(string sNetmask)
{
IPAddress netmask;
if (IPAddress.TryParse(sNetmask, out netmask) && (netmask.AddressFamily == AddressFamily.InterNetwork))
{
return(IPNetwork.ValidNetmask(netmask));
}
return(false);
}
public static bool IsWildCardNetmask(string sMask)
{
IPAddress netmask;
if (IPAddress.TryParse(sMask, out netmask) && (netmask.AddressFamily == AddressFamily.InterNetwork))
{
UInt32 maskInNumber = ~Ip2Number(sMask);
string wildcardMask = Number2Ip(maskInNumber);
IPAddress wildmask;
IPAddress.TryParse(wildcardMask, out wildmask);
return(IPNetwork.ValidNetmask(wildmask));
}
return(false);
}
private static bool IsValidNetmask(String sNetmask, AddressFamily[] allowedAddressFamilies)
{
if (allowedAddressFamilies == null || allowedAddressFamilies.Length == 0)
{
return(false);
}
IPAddress netmask = null;
if (IPAddress.TryParse(sNetmask, out netmask) && Array.Exists(allowedAddressFamilies, e => e == netmask.AddressFamily))
{
return(IPNetwork.ValidNetmask(netmask));
}
return(false);
}