https://github.com/kevinbird61/virtual-router

Using tuntap to simulate router port, implement software router and related network functions with C.
https://github.com/kevinbird61/virtual-router

c router tuntap virtualization

Last synced: 7 months ago
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Using tuntap to simulate router port, implement software router and related network functions with C.

• Host: GitHub
• URL: https://github.com/kevinbird61/virtual-router
• Owner: kevinbird61
• License: gpl-3.0
• Created: 2020-03-14T03:09:44.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2020-09-27T05:14:17.000Z (about 5 years ago)
• Last Synced: 2025-03-18T15:43:27.558Z (7 months ago)
• Topics: c, router, tuntap, virtualization
• Language: C
• Homepage: https://hackmd.io/@scyu/HyGwpzGL8
• Size: 124 KB
• Stars: 14
• Watchers: 3
• Forks: 5
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# Virtual router

Using tuntap to simulate router port, and C to implement software router and related network functions.

![](doc/virtual-router-topo.png)

We demostrate this virtual router with 2 router ports for simplicity. All environment can be run on single computer with linux network virtualization support.

1. Using namespace to simulate host machine.

2. Using `tuntap` client to simulate router's port.

3. Using virtual link (`veth`) to connect namespace with our ports in `bridge`.

## How to use

* Build demo topology

    * `./.scripts/create_topo.sh`

* Build and run virtual router

    * `make`

    * `./router.exe -i tap0 tap1`

* Run the traffic

    * ping 

        * h1 to h2: `ip netns exec h1 ping 10.0.1.1`

        * h1 to port0: `ip netns exec h1 ping 10.0.0.2`

        * h2 to h1: `ip netns exec h2 ping 10.0.0.1`

        * h2 to port1: `ip netns exec h2 ping 10.0.1.2`

## Contact

* Kevin Cyu, kevinbird61@gmail.com