This document provides instructions on how to connect to a guest OS through NAT and how to set up a shared folder between the host and guest systems using VirtualBox. It explains how to install OpenSSH on the guest OS, set up port forwarding on the host to access the guest remotely, and configure a shared folder by defining the host and guest directories and mounting the shared folder in the guest. Troubleshooting tips are also included to check firewall settings and verify the port forwarding and shared folder configurations.

1. 如何透過 NAT 連線到 guest OS
如何使用分享資料夾
Ying-Shiuan Pan
Ying­Shiuan Pan

2. 如何透過 NAT 連線到 guest OS
 Where is the VM profile?
 open­ssh server
 What is NAT?
 Add port forwarding rule
 Try to connect to guest Os

疑難排解
 Reference
Ying­Shiuan Pan

3. Where is the VM profile?
 Windows XP
 C:Documents and
Settings???.VirtualBox
 Linux
 /home/???/.VirtualBox
 each VM's profile in
 .VirtualBox/Machines/VM_name
 VM_name.xml
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4. ssh server

安裝
 $ sudo apt-get install openssh-
server
 啟動 ssh server ( 也許需要 )
 $ sudo /etc/init.d/ssh restart

測試
 $ ssh localhost
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5. What is NAT?
鳥哥
http://linux.vbird.org/linux_server/0250simple_firewall.php
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6. Check your NIC type
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7. Plan your port forwarding rule
 What is the name of your guest OS?
 eg. Ubuntu 904
 Which port in host OS?
 eg. 32790
 Which port in guest OS?
 eg. 22
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8. add port forwarding rule
 Windows:
 開始 → 執行 → cmd
 cd "Program FilessunVirtualBox"
 Linux
 應用程式 → 附屬應用程式 → 終端機 (cht)
 Applications → Accessories → Terminal (eng)

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9. add port forwarding rule
 $ VBoxManage setextradata "VM_name"
"VBoxInternal/Devices/pcnet/0/LUN#0/Config/
guestssh/Protocol" TCP
 $ VBoxManage setextradata "VM_name"
"VBoxInternal/Devices/pcnet/0/LUN#0/Config/
guestssh/GuestPort" 22
 $ VBoxManage setextradata "VM_name"
"VBoxInternal/Devices/pcnet/0/LUN#0/Config/
guestssh/HostPort" 32790
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10. add port forwarding rule
 "VM_name"
 the name of the virtual machine
 pcnet
 the NIC type
 Intel PRO... (82540em) → e1000
 PCnet­FAST (Am79c973) → pcnet
 guestssh
 the name of the rule
 TCP, 22, 32790
 protocol, guest OS port, host OS port
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11. add port forwarding rule
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12. Try to connect to guest OS (1)
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13. Try to connect to guest OS (2)
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14. Ying­Shiuan Pan

15. 疑難排解
 從 guest OS 無法連到自己的 ssh
 確認 guest OS 的 ssh 是否打開
 從 guest OS 連線到自己試試看
 從 host 無法連線到 guest
 確認 port forwarding rule 是否正確
 查看該 VM 的 profile (.xml)
 檢查 guest OS 的防火牆是否被打開了

關掉他
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16. 疑難排解
 從其他電腦無法連線到 guest OS
 是否使用 IP 分享器
 外界電腦連入需要作 IP 分享器的 port forwarding
設定
 是否 host OS 的防火牆擋住了外面連線

視不同的防火牆作設定
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17. Reference
 http://log­keep.blogspot.com/2007/09/virtualbox­
nat­port­forwarding.html
 http://blog.yam.com/flyzc/article/15137400
 http://koukaipan.pixnet.net/blog/post/23993776
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18. 如何使用分享資料夾
 Install VirtualBox Guest Addiction first
 Plan your shared folder
 Add your shared folder
 Mount your shared folder
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19. Plan your shared folder
 Directory in host OS
 /data/vbox_shared (a)
 Directory in guest OS
 /mnt/vbox_shared (b)
 The name of the shred directory
 vbox_shared (c)
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20. Add your shared folder
(a)
(c)
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21. Mount the shared folder
 Create mount point
(b)
 $ sudo mkdir /mnt/vbox_shared
 Do mount
 $ sudo mount -t vboxsf (c)
vbox_shared /mnt/vbox_shared (b)
 test
 $ cd /mnt/vbox_shared (b)
 $ ls
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22. screenshot
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