TCP/IP initializes in dual mode and is both IPv4-capable and IPv6-capable. This is the default operating mode.
However, after TCP/IP initialization and IPv6 configuration has occurred, a network administrator can stop IPv6 network traffic without affecting the IPv4 network traffic. This capability is provided through the IPV6FILTERING option on the NW TCPIP OPTION command. This option
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Does not shut down IPv6 network operation.
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Is intended to be applied if the network administrator believes that IPv6 traffic is adversely affecting MCP operation.
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Stops any IPv6 message flow in either direction between the host and the network.
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Stops IPv6 network traffic until the TCPIP network is reinitialized.
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Reduces the likelihood of any repeat occurrence of events that cause filtering to be enabled.
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Does not log any information concerning IPv6 traffic that is stopped because this might increase the chance of repeat occurrence of events that cause filtering to be enabled.
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If the network administrator wants to prevent the use of IPv6 for all future initiations of TCP/IP, the IPv4 only option should be applied as the first command in the TCP/IP initialization file.
To enable IPv6 filtering, enter the following command:
NW TCPIP OPT + IPV6FILTERING
The IPv6 Filtering option is initially disabled, which means that IPv6 traffic is allowed between the host and the network. Once the option is enabled, it cannot be disabled without stopping and then restarting TCP/IP (NW TCPIP-/+ command).
