//determines which options will be used for sending icmp requests, as well as what options
//were set in the returned icmp reply.
 
namespace System.Net.NetworkInformation
{
    // Represent the possible ip options used for the icmp packet
    public class PingOptions
    {
        const int DontFragmentFlag = 2;
        int ttl = 128;
        bool dontFragment;
 
        internal PingOptions (IPOptions options) {
            this.ttl = options.ttl;
            this.dontFragment = ((options.flags & DontFragmentFlag) > 0 ? true : false);
        }
 
        public PingOptions (int ttl, bool dontFragment) {
            if (ttl <= 0) {
                throw new ArgumentOutOfRangeException("ttl");
            }
            
            this.ttl = ttl;
            this.dontFragment = dontFragment;
        }
 
        public PingOptions () {
        }
 
        public int Ttl {
            get {
                return ttl;
            }
            set {
                if (value <= 0) {
                    throw new ArgumentOutOfRangeException("value");
                }
                ttl = value; //useful to discover routes
            }
        }
 
        public bool DontFragment {
            get {
                return dontFragment;
            }
            set {
                dontFragment = value;  //useful for discovering mtu
            }
        }
    }
}