- 128 bit address space (IPv4 uses 32 bit)
- Easier configuration (IPv4 uses DHCP or manual setting static IP address)
- Built-in security
- Better support for Quality of Service (QoS)
To uninstall IPv6 (And only use IPv4) in WinXP:
- Open Control Panel -> Network Connection
- Right Click the network interface card, and select Properties.
- Select IPv6 and press Uninstall
- Vista/Win7 cannot uninstall IPv6 but clearing the checkbox for IPv6 will disable it for the network connection. More Info MS KB929852
- Restart
More Info MS KB815768
More Info MS KB817778
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