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CS4231 Local Area Networks HW2 – PC-Based Bridge

CS4231 Local Area Networks HW2 – PC-Based Bridge. Overview. LAN seg. 1. LAN seg. 2. Summary. 目的 連接 LAN1 與 LAN2 Frame forwarding Frame filtering Hint Data link layer socket programming Library: libpcap libnet. Bridge. Layer 2 network device Connect 2 LAN seg.

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CS4231 Local Area Networks HW2 – PC-Based Bridge

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  1. CS4231Local Area NetworksHW2 – PC-Based Bridge

  2. Overview LAN seg. 1 LAN seg. 2

  3. Summary • 目的 • 連接LAN1與LAN2 • Frameforwarding • Framefiltering • Hint • Data link layer socket programming • Library: • libpcap • libnet

  4. Bridge • Layer 2 network device • Connect 2 LAN seg.

  5. Programming Environment • You can write your program on Linux/Windows platform. • You can install VMware to run the guest OS(Linux, Windows) on it.

  6. Environment Construction • 一台有一張以上網卡的電腦 (PC_E) • 其他電腦用連接至 PC_E • PC_E 需安裝 Linux/Windows作業系統以及 • Linux: libpcap, libnet • Windows: winpcap or raw socket lib(winsock2) • 亦可在 Windows 下使用 VMware 安裝 Linux 代替PC_E • 仍須兩張實體/虛擬Vmware Host網路卡 • 使 Virtual Machine 的兩張虛擬網路卡分別橋接至兩張實體/虛擬Vmware Host網路卡

  7. Edit VM Setting

  8. Add a Host Virtual Adapters

  9. Add a Ethernet Card 建立兩個 subnet

  10. Add a Ethernet Card

  11. Add a Ethernet Card

  12. Add a Ethernet Card 兩張網卡分別對應到eth0, eth1

  13. Bridge Guest NIC to Host NIC 兩張網卡分別bridged 到 VMnet2, VMnet3

  14. VMware - Environment Construction • 2 VMnet • VMnet4, VMnet5 • 4~5 virtual machines • One of them is quipped with 2 virtual NIC • 2NICs are bridged to VMnet4 and VMnet5 respectively

  15. VM configuration • 所有 VM 在同一網段 (192.168.1.x) 下 • 或是 LAN1 / LAN2 各一個網段但所有的 netmask 要設為 255.255.0.0 才能互通 • 虛擬網路卡 bridge 到相對應的 VMnet 192.168.1.1 192.168.1.5 192.168.1.3 192.168.1.4 192.168.1.2

  16. 複製 VM • 複製整個 VMimage 的資料夾 • 若出現 ”this virtual machine appears to be in use” 的錯誤訊息，記得先將 VMware image 檔資料夾內副檔名為 .lck 的資料夾刪除 • “找不到網卡” • sudo su • rm /etc/udev/rules.d/70-persistent-net.rules • reboot

  17. 手動設定 IP • sudo su • vi /etc/network/interfaces • auto eth0 • iface eth0 inet staticaddress 192.168.1.1netmask 255.255.255.0 • /etc/init.d/networking restart

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