3Com 3C840 User Manual page 195

1 Configure the Local WAN IP Address:
If the ISP provided you with a single IP address, select Specified and
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enter that address.
If you are using PPP to dynamically assign an address, select Dynamic,
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and the remote site on the WAN will assign a local WAN IP address to
you.
Otherwise, select Unnumbered, and there will be no IP address
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assigned to the VC connection.
Configure the Remote WAN IP Address:
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If the ISP provided a remote IP address and netmask, select Specified
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and type in that address and netmask.
If the OfficeConnect Remote 840 is learning the remote IP address
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from the remote site (PPP only), select Learn From Remote.
In order to designate the remote site you are configuring as the
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default gateway, check the Use Remote as Default Gateway
checkbox.(Only one remote site can be designated as the default
gateway.)
Instructions for Internet Access E-5