Added service id to DHCP offer, added new asciinema and a try to pyth…

…on perf

Program.cs

@@ -75,7 +75,7 @@ public static async void StartServer(string interfaceIp, string targetIp)
             Console.WriteLine($"Client will receive IP {targetIp}");
             server.OnDataReceived += delegate (DHCPRequest dhcpRequest)
             {
-                Request(dhcpRequest, IPAddress.Parse(targetIp));
+                Request(dhcpRequest, IPAddress.Parse(targetIp), interfaceIp);
             };
             server.BroadcastAddress = IPAddress.Broadcast;
             server.SendDhcpAnswerNetworkInterface = intf;
@@ -84,13 +84,14 @@ public static async void StartServer(string interfaceIp, string targetIp)
             await LoadingIndicator();
         }
 
-        static void Request(DHCPRequest dhcpRequest, IPAddress targetIp)
+        static void Request(DHCPRequest dhcpRequest, IPAddress targetIp, string interfaceIp)
         {
             try
             {
                 var type = dhcpRequest.GetMsgType();
                 var replyOptions = new DHCPReplyOptions();
                 replyOptions.SubnetMask = IPAddress.Parse("255.255.255.0");
+                replyOptions.ServerIdentifier = IPAddress.Parse(interfaceIp);
 
                 if (type == DHCPMsgType.DHCPDISCOVER)
                 {

README.md

@@ -1,6 +1,6 @@
 # dhcpshot
 
-[![asciicast](https://asciinema.org/a/OyMydvQOw3imDCD9OLiyiPlUB.svg)](https://asciinema.org/a/OyMydvQOw3imDCD9OLiyiPlUB)
+[![asciicast](https://asciinema.org/a/297377.svg)](https://asciinema.org/a/297377)
 
 Use [DotNetProjects.DhcpServer](https://www.nuget.org/packages/DotNetProjects.DhcpServer/) library to quickly create a predefined DHCP Server answering with a fixed IP to request coming from the interface specified by the user. E.g.: you connect your RPI in DHCP mode directly to your laptop's ethernet interface.
 

perfs/README.md

@@ -39,4 +39,13 @@ $ time for i in {1..30}; do bin/release/netcoreapp3.0/osx-x64/publish/perfs; don
 real    0m38.211s
 user    0m31.473s
 sys     0m0.958s
+```
+
+```sh
+$ python3
+Python 3.7.5 (default, Nov 26 2019, 23:16:23) 
+$ time python3 perf.py 
+real    3m34.382s
+user    3m21.708s
+sys     0m1.565s
 ```

perfs/python/perf.py

@@ -0,0 +1,15 @@
+import random
+import math
+import sys 
+
+def Sum(a, b):
+    return a + b + random.randint(0,1024)#sys.maxsize)
+
+def main():
+    sum = 0
+    for count in range(0, 10**8):
+        sum = Sum(sum, count)
+    return sum
+
+if __name__ == "__main__":
+    main()