u-Boot is only a bootloader. You should not expect a full-feature
IP stack functionality from it. u-Boot does support multiple Ethernet
interfaces, but you can use them one at a time. If you connect more than
one Ethernet link to a u-Boot-controlled box, and all links are active,
you have to specify which link to use by assigning a value to "ethact"
environment variable. If anything above that is desired, e.g. membership
in more than one IP subnet, packet forwarding, advanced diagnostics,
the suggestion is to boot Linux or another OS with a full IP stack
implementation.
Have a great day,
Platon
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