Using the HP DTC Manager/UX

76
Configuring DNS/IP parameters
7
IP Routing parameter definitions
Default IP Router
Address
Enter the IP address of the default router. The router routes outbound packets for
destinations which are not part of the local subnet.
Backup IP Router
Address
Enter the IP address of the router to be used if the default IP router is not available.
Subnet Mask Enter the subnet mask for this network. The subnet mask has an IP address format of
xxx.xxx.xxx.xxx where xxx is a decimal number between 0 and 255. It must have 255
in the first field. The subnet mask is an optional parameter.
The subnet mask provides a way to expand the network part of the IP address. The
subnet mask is used by IP to check if the datagram should be sent to the destination
without routing, or routed to a different destination network or subnetwork.
About subnets
A subnet is a portion of a network defined as a separate network. The subnet mask
specifies how much of the address to reserve for subdividing networks into
subnetworks. What defines a subnet is that all the bits in the IP address specified by
the subnet mask (that is all the bits set to 1 in the subnet mask) are the same for all
IP addresses in that subnet.
Example: If the subnet mask is:
255.255.255.224 (1111 1111 1111 1111 1111 1111 1110 0000)
then the right-most 5 bits of any address on the subnetwork indicate a node address.