diff --git a/Uebung2/basic.p4 b/Uebung2/basic.p4
new file mode 100644
index 0000000..7d1c574
--- /dev/null
+++ b/Uebung2/basic.p4
@@ -0,0 +1,242 @@
+/* -*- P4_16 -*- */
+#include <core.p4>
+#include <v1model.p4>
+
+const bit<16> TYPE_IPV4 = 0x800;
+
+// IPv4 protocol types
+// TCP
+const bit<8> IP_PROTO_TCP = 0x06;
+// UDP
+const bit<8> IP_PROTO_UDP = 0x11;
+
+/*************************************************************************
+*********************** H E A D E R S  ***********************************
+*************************************************************************/
+
+typedef bit<9>  egressSpec_t;
+typedef bit<48> macAddr_t;
+typedef bit<32> ip4Addr_t;
+
+header ethernet_t {
+    macAddr_t dstAddr;
+    macAddr_t srcAddr;
+    bit<16>   etherType;
+}
+
+header ipv4_t {
+    bit<4>    version;
+    bit<4>    ihl;
+    bit<8>    diffserv;
+    bit<16>   totalLen;
+    bit<16>   identification;
+    bit<3>    flags;
+    bit<13>   fragOffset;
+    bit<8>    ttl;
+    bit<8>    protocol;
+    bit<16>   hdrChecksum;
+    ip4Addr_t srcAddr;
+    ip4Addr_t dstAddr;
+}
+
+
+header tcp_t {
+    bit<16> srcPort;
+    bit<16> dstPort;
+    bit<32> seqNo;
+    bit<32> ackNo;
+    bit<4>  dataOffset;
+    bit<3>  res;
+    bit<3>  ecn;
+    bit<6>  ctrl;
+    bit<16> window;
+    bit<16> checksum;
+    bit<16> urgentPtr;
+}
+
+header udp_t {
+    bit<16> srcPort;
+    bit<16> dstPort;
+    bit<16> len;
+    bit<16> checksum;
+    bit<120> payload;
+}
+
+struct udp_metadata_t {
+    bit<16> udp_payload_length;
+}
+
+struct metadata {
+    udp_metadata_t udp_metadata;
+    //tcp_metadata_t tcp_metadata;
+    bit<1> modified;
+    bit<8> read_from_register;
+}
+
+struct headers {
+    ethernet_t   ethernet;
+    ipv4_t       ipv4;
+    tcp_t        tcp;
+    udp_t        udp;
+}
+
+// Additional error values
+error {
+    UnhandledIPv4Options,
+    IPv4IncorrectVersion,
+    BadIPv4HeaderChecksum
+}
+
+/*************************************************************************
+*********************** P A R S E R  ***********************************
+*************************************************************************/
+
+parser MyParser(packet_in packet,
+                out headers hdr,
+                inout metadata meta,
+                inout standard_metadata_t standard_metadata) {
+
+    state start {
+        transition parse_ethernet;
+    }
+
+    state parse_ethernet {
+        packet.extract(hdr.ethernet);
+        transition select(hdr.ethernet.etherType) {
+            TYPE_IPV4: parse_ipv4;
+            default: accept;
+        }
+    }
+
+    state parse_ipv4 {
+        packet.extract(hdr.ipv4);
+        verify(hdr.ipv4.version == 4, error.IPv4IncorrectVersion);
+        verify(hdr.ipv4.ihl == 5, error.UnhandledIPv4Options);
+        transition select(hdr.ipv4.protocol) {
+            IP_PROTO_TCP: parse_tcp;
+            IP_PROTO_UDP: parse_udp;
+            default: accept;
+        }
+    }
+
+    state parse_tcp {
+        packet.extract(hdr.tcp);
+        transition accept;
+    }
+
+    state parse_udp {
+        packet.extract(hdr.udp);
+        transition accept;
+    }
+}
+
+/*************************************************************************
+************   C H E C K S U M    V E R I F I C A T I O N   *************
+*************************************************************************/
+
+control MyVerifyChecksum(inout headers hdr, inout metadata meta) {
+    apply {  }
+}
+
+
+/*************************************************************************
+**************  I N G R E S S   P R O C E S S I N G   *******************
+*************************************************************************/
+
+
+
+control MyIngress(inout headers hdr,
+                  inout metadata meta,
+                  inout standard_metadata_t standard_metadata) {
+
+    action drop() {
+        mark_to_drop();
+    }
+
+    action ipv4_forward(macAddr_t dstAddr, egressSpec_t port) {
+        standard_metadata.egress_spec = port;
+        hdr.ethernet.srcAddr = hdr.ethernet.dstAddr;
+        hdr.ethernet.dstAddr = dstAddr;
+        hdr.ipv4.ttl = hdr.ipv4.ttl - 1;
+    }
+
+    table ipv4_lpm {
+        key = {
+            hdr.ipv4.dstAddr: lpm;
+        }
+        actions = {
+            ipv4_forward;
+            drop;
+            NoAction;
+        }
+        size = 1024;
+        default_action = drop();
+    }
+
+
+    apply {
+        if (hdr.ipv4.isValid()) {
+       		ipv4_lpm.apply();
+        }
+    }
+}
+
+/*************************************************************************
+****************  E G R E S S   P R O C E S S I N G   *******************
+*************************************************************************/
+
+control MyEgress(inout headers hdr,
+                 inout metadata meta,
+                 inout standard_metadata_t standard_metadata) {
+    apply {  }
+}
+
+/*************************************************************************
+*************   C H E C K S U M    C O M P U T A T I O N   **************
+*************************************************************************/
+
+control MyComputeChecksum(inout headers  hdr, inout metadata meta) {
+     apply {
+	update_checksum(
+	    hdr.ipv4.isValid(),
+            { hdr.ipv4.version,
+	      hdr.ipv4.ihl,
+              hdr.ipv4.diffserv,
+              hdr.ipv4.totalLen,
+              hdr.ipv4.identification,
+              hdr.ipv4.flags,
+              hdr.ipv4.fragOffset,
+              hdr.ipv4.ttl,
+              hdr.ipv4.protocol,
+              hdr.ipv4.srcAddr,
+              hdr.ipv4.dstAddr },
+            hdr.ipv4.hdrChecksum,
+            HashAlgorithm.csum16);
+    }
+}
+
+/*************************************************************************
+***********************  D E P A R S E R  *******************************
+*************************************************************************/
+
+control MyDeparser(packet_out packet, in headers hdr) {
+    apply {
+        packet.emit(hdr.ethernet);
+        packet.emit(hdr.ipv4);
+        packet.emit(hdr.tcp);
+        packet.emit(hdr.udp);
+    }
+}
+
+/*************************************************************************
+***********************  S W I T C H  *******************************
+*************************************************************************/
+
+V1Switch(
+MyParser(),
+MyVerifyChecksum(),
+MyIngress(),
+MyEgress(),
+MyComputeChecksum(),
+MyDeparser()
+) main;
diff --git a/Uebung2/topology.json b/Uebung2/topology.json
new file mode 100644
index 0000000..71c501c
--- /dev/null
+++ b/Uebung2/topology.json
@@ -0,0 +1,14 @@
+{
+    "hosts": [
+        "h1",
+        "h2"
+    ],
+    "switches": {
+        "s1": { },
+        "s2": { }
+    },
+    "links": [
+        ["h1", "s1"],  ["h2", "s2"],
+        ["s1","s2"],  ["s1","s2"]
+    ]
+}