Mac OS X 10.6.x Network Configuration: TCP/IP Configuration for Ethernet

Configuring TCP/IP

1. The System Preferences application should already be open, with the Network pane selected. The location you wish to configure should appear in the Network pane's Location pop-up menu.
   
2. In the list of network interfaces displayed along the left side of the Network pane, select the interface you wish to configure.
3. Click the Advanced... button near the lower-right corner of the display of basic configuration items. This displays a sheet with advanced configuration items for the selected interface, organized under a series of tabs.
4. If you do use DHCP service (normally recommended), follow these steps:
   
   1. Click the TCP/IP tab. Configure TCP/IP as follows:
      
      1. In the Configure IPv4 pop-up menu, select Using DHCP.
      2. Make sure the DHCP Client ID field is empty.
      3. In the Configure IPv6 pop-up menu, select Off.
   2. Click the DNS tab. Configure DNS as follows:
      
      1. Make sure that the DNS Servers list is empty or contains only IP addresses that are in greyed-out type. (Addresses that are greyed-out are ones the device has learned via non-manual configuration, such as DHCP or BootP. These are fine.) If any IP address appears in this list in normal type (not greyed-out), remove that IP address by selecting it and then clicking the - (minus) button below the list.
      2. Make sure that the Search Domains list is empty or contains only DNS domains that are in greyed-out type. (DNS domains that are greyed-out are ones the device has learned via non-manual configuration, such as DHCP or BootP. These are fine.) If any DNS domain appears in this list in normal type (not greyed-out), remove that DNS domain by selecting it and then clicking the - (minus) button below the list.
   3. Click the WINS tab. Configure WINS as follows:
      
      1. A NetBIOS Name may already be set. If the computer has obtained an IP address, and was able to use DNS to resolve that IP address to a DNS hostname, it uses the first component of the DNS hostname as the NetBIOS Name. Otherwise, if a Computer Name is set in the Sharing pane of System Preferences, it may use that.
      2. Make sure that the WINS Servers list is empty or contains only IP addresses that are in greyed-out type. (Addresses that are greyed-out are ones the device has learned via non-manual configuration, such as DHCP or BootP. These are fine.) If any IP address appears in this list in normal type (not greyed-out), remove that IP address by selecting it and then clicking the - (minus) button below the list.
5. If you use BootP service instead of DHCP (not usually recommended), follow these steps:
   
   1. Click the TCP/IP tab. Configure TCP/IP as follows:
      
      1. In the Configure IPv4 pop-up menu, select Using BootP.
      2. In the Configure IPv6 pop-up menu, select Off.
   2. Click the DNS tab. Configure DNS as follows:
      
      1. Make sure that the DNS Servers list is empty or contains only IP addresses that are in greyed-out type. (Addresses that are greyed-out are ones the device has learned via non-manual configuration, such as DHCP or BootP. These are fine.) If any IP address appears in this list in normal type (not greyed-out), remove that IP address by selecting it and then clicking the - (minus) button below the list.
      2. Make sure that the Search Domains list is empty or contains only DNS domains that are in greyed-out type. (DNS domains that are greyed-out are ones the device has learned via non-manual configuration, such as DHCP or BootP. These are fine.) If any DNS domain appears in this list in normal type (not greyed-out), remove that DNS domain by selecting it and then clicking the - (minus) button below the list.
   3. Click the WINS tab. Configure WINS as follows:
      
      1. A NetBIOS Name may already be set. If the computer has obtained an IP address, and was able to use DNS to resolve that IP address to a DNS hostname, it uses the first component of the DNS hostname as the NetBIOS Name. Otherwise, if a Computer Name is set in the Sharing pane of System Preferences, it may use that.
      2. In the WINS Servers list, enter the following items, one per line:

         128.112.128.95
               128.112.128.97

         In order to enter each line in the list, you will need to first click the + (plus) button button below the list.
6. If you use manual configuration instead of DHCP or BootP service (not normally recommended except in unusual circumstances), follow these steps:
   
   1. Click the TCP/IP tab. Configure TCP/IP as follows:
      
      1. In the Configure IPv4 pop-up menu, select Manually. (Never select Using DHCP with manual IP address.)
      2. In the IPv4 Address field, enter the IP address assigned to the network interface you are configuring. This will be a value like: 128.112.aaa.bbb or 140.180.aaa.bbb (your numbers may be different). Before entering it, be absolutely sure you are entering your network interface's assigned IP address, not the address of your default IP router, or another computer's IP address.
      3. In the Subnet Mask field, enter the subnet mask (a.k.a. "network mask", or "netmask") appropriate for your IP address. This will be a value like 255.255.252.0 (your numbers may be different).
      4. In the Router field, enter the default IP router (a.k.a. "gateway") address appropriate for your IP address. This will be value like 128.112.aaa.bbb or 140.180.aaa.bbb (your numbers will be different).
      5. In the Configure IPv6 pop-up menu, select Off.
   2. Click the DNS tab. Configure DNS as follows:
      
      1. In the DNS Servers list, enter any three of the following four address, one per line (you may enter them in any order):

         128.112.133.220
               128.112.129.32
               128.112.129.111
               128.112.128.1

         In order to enter each line, you will need to first click the + (plus) button button below the list.
      2. Determine your default DNS domain name. This is your Mac's Internet hostname, with the first word (up through the first period) removed. If your Mac is associated with a Dormnet subscription, your default DNS domain name is student.princeton.edu. Otherwise, your default DNS domain name is usually princeton.edu. (A few departments have a different default DNS domain name, e.g. basketweaving.princeton.edu.) If your default DNS domain name is princeton.edu, etner (only) princeton.edu in the Search Domains list. The list should contain no other entries.
         Otherwise, if your Mac's default DNS domain name is not princeton.edu, enter the default DNS domain name as the first entry in the Search Domains list. Enter princeton.edu as the second entry in the list. The order of the entries is important. For example, if your Mac's default DNS domain name is basketweaving.princeton.edu, enter basketweaving.princeton.edu as the first entry in the list, and princeton.edu as the second entry in the list.
         (If there are multiple DNS subdomains between your Mac's default DNS domain name and princeton.edu, enter each name in the list, one per line, starting with the most-specific domain name. For example, if your Mac's hostname is foo.bar.baz.princeton.edu, your default DNS domain name is bar.baz.princeton.edu, so enter bar.baz.princeton.edu, baz.princeton.edu, and princeton.edu, in that order.
         In order to enter each line in the list, you will need to first click the + (plus) button button below the list.
         
   3. Click the WINS tab. Configure WINS as follows:
      
      1. A NetBIOS Name may already be set. If the computer was able to use DNS to resolve the IP address you entered above, it uses the first component of the DNS hostname as the NetBIOS Name. Otherwise, if a Computer Name is set in the Sharing pane of System Preferences, it may use that.
      2. In the WINS Servers list, enter the following items, one per line:

         128.112.128.95
               128.112.128.97

         In order to enter each line in the list, you will need to first click the + (plus) button button below the list.
7. Click the OK button in the lower right corner of the network port's advanced configuration sheet to dismiss the sheet and return to the basic settings for this network port.
8. Click the Apply  button in the lower-right corner of the Network pane to save the configuration for this network port.