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Multiple NICs per physical network
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| bet | 28/161 | | Sana | 21.03.2017 | | Hajmi | 0.8 Mb. | | #1047 |
Multiple NICs per physical network. There are no restrictions, other than hardware limitations on the number of NICs.
Multiple networks and media types. There are no restrictions, other than hardware and media support. See the “The NDIS Interface and Below” section for supported media types.
When an IP datagram is sent from a multihomed host, it is passed to the interface with the best apparent route to the destination. Accordingly, the datagram may contain the source IP address of one interface in the multihomed host, yet be placed on the media by a different interface. The source MAC address on the frame is that of the interface that actually transmitted the frame to the media, and the source IP address is the one that the sending application sourced it from, not necessarily one of the IP addresses assigned to the sending interface.
When a computer is multihomed with NICs attached to disjoint networks (networks that are separate from and unaware of each other, such as a private network using private addressing and the Internet), routing problems may arise. It is often necessary to set up static routes to the private networks in this situation.
When configuring a computer to be multihomed on two disjoint networks, the best practice is to configure the default gateway on the interface connected to the largest and least-known network, in which the default route summarizes the most destinations. Then, either add static routes or use a routing protocol to provide connectivity to the hosts on the smaller or better-known network. Avoid configuring a different default gateway on each side; this can result in unpredictable behavior and loss of connectivity. For more information, see Default Gateway Behavior for Windows TCP/IP.
Note There can only be one active default gateway for a computer at any moment in time.
More details on name registration, resolution, and choice of NIC on outbound datagrams with multihomed computers are provided in the “Transmission Control Protocol (TCP),” “NetBIOS over TCP/IP,” and “Windows Sockets” sections of this paper.
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