USRobotics NETServer/8 - Manual (Page 67)

Network Dial In Access 5-9
Protocol
Select the protocol to be used for the connection (PPP or SLIP).
Use the following command:
set user <name> protocol < ppp | slip>
IPX remote access sessions require the PPP protocol. If you have
specified an IPX Network Number, the NETServer will set this
to PPP automatically.
Netmask
This is the user’s IP subnet mask. Use the following command:
set user <name> netmask <netmask>
MTU
The Maximum Transmission Unit specifies the size of the largest
packet that may be sent to this user. IPX connections will
discard larger packets. IP connections will fragment larger
packets prior to transmission. Normally, this should be set to
the largest value that the user’s system can handle.
Valid PPP MTUs range from 100 to 1500 (default is 1500). Note
that PPP allows a remote system to negotiate a smaller MTU if
needed. Valid SLIP MTUs range from 100 to 1006 (default is
1006).
set user <name> mtu <value>
IPX connections require an MTU of 1500. When you assign an
IPX Network Number, the NETServer will set this to 1500
automatically.