TCP/IP Stack

Implementing the TCP/IP Model in C from scratch.

Build a MultiNode Topology Emulation of Routers and Switches
Implement DataLink Layer (L2 routing), including ARP
Implement L2 Switching (Mac-based Learning and Forwarding)
Implement VLAN Based MAC learning and Forwarding
Implement Network Layer (L3 routing)

Network Topologies

L2 Switch Topology

                                       +-----------+
                                       |  H4       |
                                       | 122.1.1.4 |
                                       +----+------+
                                            |eth0/7 - 10.1.1.3/24       
                                            |       
                                            |eth0/1
                                       +----+----+                        +--------+
       +---------+                     |         |                        |        |
       |         |10.1.1.2/24          |   L2Sw  |eth0/2       10.1.1.1/24|  H3    |
       |  H1     +---------------------+         +------------------------+122.1.1.3|
       |122.1.1.1|eth0/5         eth0/4|         |                 eth0/6 |        |
       + --------+                     |         |                        |        |
                                       +----+----+                        +--------+
                                            |eth0/3     
                                            |
                                            |
                                            |
                                            |10.1.1.4/24
                                            |eth0/8
                                      +----++------+
                                      |            |
                                      |   H2       |
                                      |122.1.1.2   |
                                      |            |
                                      +------------+

Square Topology

  +-----------+                      +--------+                            +--------+
  |           |eth0/0     10.1.1.2/24|        | eth0/2               eth0/3|        |
  | R1        +----------------------|  R2    +----------------------------+   R3   |
  |122.1.1.1  |10.1.1.1/24     eth0/1|122.1.1.2|  20.1.1.1/24   20.1.1.2/24| 122.1.1.3|
  +---+--+----+                      |        |                            +-       +
         |eth0/7                     +--------+                            +----+---+
         | 40.1.1.2/24                                                          | eth0/4   
         |                                                                      |30.1.1.1/24
         |                                                                      |
         |                                                                      |
         |                                                                      |
         |                                                                      |
         |                                                                      |
         |                          +-----------+                               |
         |                          |           |                               |
         |                  eth0/6  |  R4       |                               |
         +--------------------------+ 122.1.1.4 |                               |
                         40.1.1.1/24|           +-------------------------------+
                                    |           |eth0/5
                                    +-----------+30.1.1.2/24

config node R1 route /
122.1.1.2 32 10.1.1.2 eth0/0
122.1.1.3 32 10.1.1.2 eth0/0
122.1.1.4 32 40.1.1.1 eth0/7
cd
conf node R2 route 122.1.1.3 32 20.1.1.2 eth0/2
run node R1 ping 122.1.1.3

Dual Switch Topology

                                    +---------+                               +----------+
                                    |         |                               |          |
                                    |  H2     |                               |  H5      |
                                    |122.1.1.2|                               |122.1.1.5 |                                           
                                    +---+-----+                               +-----+----+                                           
                                        |10.1.1.2/24                                +10.1.1.5/24                                                
                                        |eth0/3                                     |eth0/8                                                
                                        |                                           |                                                
                                        |eth0/7,AC,V10                              |eth0/9,AC,V10                                                
                                  +-----+----+                                +-----+---+                                            
                                  |          |                                |         |                                            
   +------+---+                   |          |                                |         |                         +--------+         
   |  H1      |10.1.1.1/24        |   L2SW1  |eth0/5                    eth0/7| L2SW2   |eth0/10           eth0/11|  H6    |         
   |122.1.1.1 +-------------------|          |+-------------------------------|         +-------------+----------+122.1.1.6|         
   +------+---+ eth0/1      eth0/2|          |TR,V10,V11            TR,V10,V11|         |AC,V10        10.1.1.6/24|        |         
                            AC,V10|          |                                |         |                         +-+------+         
                                  +-----+----+                                +----+----+                                            
                                        |eth0/6                                    |eth0/12     
                                        |AC,V11                                    |AC,V11 
                                        |                                          |  
                                        |                                          |  
                                        |                                          |  
                                        |                                          |eth0/11
                                        |eth0/4                                    |10.1.1.4/24  
                                        |10.1.1.3/24                             +--+-----+
                                   +----+---+|                                   | H4     |
                                   |  H3     |                                   |        |
                                   |122.1.1.3|                                   |122.1.1.4|
                                   +--------+|                                   +--------+

Linear 3 Node Topology

                                        +---------|                                  +----------+
+--------+                              |         |                                  |R3        |
|R1      |eth0/1                  eth0/2|R2       |eth0/3                      eth0/4|122.1.1.3 |
|122.1.1.1+-----------------------------+122.1.1.2|+----------------------------------+         |
|        |10.1.1.1/24        10.1.1.2/24|         |11.1.1.2/24            11.1.1.1/24|          |
+--------+                              +-------+-|                                  +----------+

L2 Loop Topology

                                    +---------+                               +----------+
                                    |         |eth0/4                   eth0/4|          |
                                    |  L2SW4  +-------------------------------+  L2SW3   |
                                    |         |TR,V10                   TR,V10|          |                                           
                                    +---+-----+                               +-----+----+                                           
                                        |TR,V10                                     +TR,V10                                          
                                        |eth0/3                                     |eth0/8                                                
                                        |                                           |                                                
                                        |eth0/7,TR,V10                              |eth0/9,TR,V10                                                
                                  +-----+----+                                +-----+---+                                            
                                  |          |                                |         |                                            
   +------+---+                   |          |                                |         |                         +--------+         
   |  H1      |10.1.1.1/24        |   L2SW1  |eth0/5                    eth0/7| L2SW2   |eth0/10           eth0/11|  H6    |         
   |122.1.1.1 +-------------------|          |+-------------------------------|         +-------------+----------+122.1.1.6|         
   +------+---+ eth0/1      eth0/2|          |TR,V10                    TR,V10|         |AC,V10        10.1.1.6/24|        |         
                            AC,V10|          |                                |         |                         +-+------+         
                                  +-----+----+                                +----+----+

License

bruce-mig/tcp-ip-stack

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