2015.10.05 Updated > Network Device Development - Part 3: Firewall 102 ~ IP Filter

•

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Cheng-Yi Yu

Network Device Development Part 3: Firewall 102 ~ IP Filter How to develop a network device like firewall

Software

Network Device
Development
PART 3 – Firewall 102: IP Filter
SEAN

Sean
• Developer
• erinus.startup@gmail.com
• https://www.facebook.com/erinus

GitHub
https://github.com/erinus/NetworkDeviceDevelop
ment

Read Me
It is a series of training. If you have no experience
on kernel module development, you must view
other presentations.
1. Network Device Development - Part 1: Switch
http://www.slideshare.net/erinus/network-device-
development-part-1-switch
2. Network Device Development - Part 2: Firewall
101
http://www.slideshare.net/erinus/network-device-
development-part-2-firewall-101

VMnet2
192.168.102.?
VMnet3
192.168.103.?
CLIENT
Ubuntu Desktop
192.168.102.128
CLIENT
Ubuntu Desktop
192.168.103.128
SWITCH
Debian
VMnet1
NAT
eth1 eth2
eth0
TCP (IP 192.168.103.128)
ICMP (IP 192.168.103.128)

Modify main.c
192.168.103.128
to
C0A86780
192.168.103.*
to
FFFFFF00

Create HTTP Server on CLIENT of VMnet3
$ sudo python server.py

Test on CLIENT of VMnet2
Open Web Browser and connect:
1. http://192.168.103.128:80/ Failure
2. http://192.168.103.128:8080/ Failure
$ ping 192.168.103.128 Success

Change IP on CLIENT of VMnet3
# 192.168.103.128 to 192.168.103.129
$ sudo ifconfig eth1 192.168.103.129 netmask
255.255.255.0
$ sudo ip route add 192.168.102.0/24 via
192.168.103.129

Test on CLIENT of VMnet2
Open Web Browser and connect:
1. http://192.168.103.129:80/ Success
2. http://192.168.103.129:8080/ Success
$ ping 192.168.103.129 Success

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2015.10.05 Updated > Network Device Development - Part 3: Firewall 102 ~ IP Filter

1. Network Device Development PART 3 – Firewall 102: IP Filter SEAN

2. Sean • Developer • erinus.startup@gmail.com • https://www.facebook.com/erinus

3. GitHub https://github.com/erinus/NetworkDeviceDevelop ment

4. Read Me It is a series of training. If you have no experience on kernel module development, you must view other presentations. 1. Network Device Development - Part 1: Switch http://www.slideshare.net/erinus/network-device- development-part-1-switch 2. Network Device Development - Part 2: Firewall 101 http://www.slideshare.net/erinus/network-device- development-part-2-firewall-101

5. First IP Filter

6. VMnet2 192.168.102.? VMnet3 192.168.103.? CLIENT Ubuntu Desktop 192.168.102.128 CLIENT Ubuntu Desktop 192.168.103.128 SWITCH Debian VMnet1 NAT eth1 eth2 eth0 TCP (IP 192.168.103.128) ICMP (IP 192.168.103.128)

7. Modify main.c 192.168.103.128 to C0A86780 192.168.103.* to FFFFFF00

8. Modify main.c IP 192.168.103.128 ?

9. Install $ make $ make install $ dmesg

10. Test your Firewall

11. Create HTTP Server on CLIENT of VMnet3 $ sudo python server.py

12. Test on CLIENT of VMnet2 Open Web Browser and connect: 1. http://192.168.103.128:80/ Failure 2. http://192.168.103.128:8080/ Failure $ ping 192.168.103.128 Success

13. Change IP on CLIENT of VMnet3 # 192.168.103.128 to 192.168.103.129 $ sudo ifconfig eth1 192.168.103.129 netmask 255.255.255.0 $ sudo ip route add 192.168.102.0/24 via 192.168.103.129

14. Test on CLIENT of VMnet2 Open Web Browser and connect: 1. http://192.168.103.129:80/ Success 2. http://192.168.103.129:8080/ Success $ ping 192.168.103.129 Success

15. Second IP Wildcard Filter

16. VMnet2 192.168.102.? VMnet3 192.168.103.? CLIENT Ubuntu Desktop 192.168.102.128 CLIENT Ubuntu Desktop 192.168.103.128 SWITCH Debian VMnet1 NAT eth1 eth2 eth0 TCP (IP 192.168.103.*) ICMP (IP 192.168.103.*)

17. Modify main.c IP Wildcard Support

18. Modify main.c IP Rule 192.168.103.*

19. Install $ make $ make install $ dmesg

20. Test your Firewall

21. Create HTTP Server on CLIENT of VMnet3 $ sudo python server.py

22. Test on CLIENT of VMnet2 Open Web Browser and connect: 1. http://192.168.103.128:80/ Failure 2. http://192.168.103.128:8080/ Failure $ ping 192.168.103.128 Success

23. Next Part

24. Firewall 103

2015.10.05 Updated > Network Device Development - Part 3: Firewall 102 ~ IP Filter

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