7-20 Administrator’s Handbook
This screen consists of between two and eight rows of four columns each. There are exactly as many rows as
there are Ethernet IP subnets configured on the IP Subnets screen.
•
The
Subnet (# host addrs)
column is non-selectable and non-editable. It indicates the network address of
the Ethernet IP subnet for which an address pool is being configured and the number of host addresses
available on the subnet. The network address is equal to the gateway’s IP address on the subnet
bitwise-ANDed with the subnet mask. The host address count is equal to the subnet size minus three,
since one address is reser ved for the network address, one for the subnet broadcast address, and one for
the gateway’s inter face address on the subnet.
You can edit the remaining columns in each row.
•
The
1st Client Addr
and
Clients
columns allow you to specify the base and extent of the address ser ving
pool for a par ticular subnet. Entering 0.0.0.0 for the first client address or 0 for the number of clients
indicates that no addresses will be ser ved from the corresponding Ethernet IP subnet.
•
The Client Gateway column allows you to specify the default gateway address that will be provided to
clients ser ved an address from the corresponding pool. The value defaults to the Router’s IP address on
the corresponding subnet (or the Router’s default gateway, if that gateway is located on the subnet in
question). You can override the value by entering any address that is par t of the subnet.
DHCP, BootP, and dynamic WAN clients may receive an address from any one of the address ser ving pools
configured on this screen.
Numerous factors influence the choice of ser ved address. It is difficult to specify the address that will be
ser ved to a par ticular client in all circumstances. However, when the address ser ver has been configured, and
the clients involved have no prior address ser ving interactions, the Router will generally ser ve the first unused
address from the first address pool with an available address. The Router star ts from the pool on the first row
and continues to the pool on the last row of this screen.
Once the address ser ver and/or the clients have par ticipated in address ser ving transactions, different rules
apply:
IP Address Pools
Subnet (# host addrs) 1st Client Addr Clients Client Gateway
--------------------- --------------- ------- --------------
192.128.117.0 (253) 192.128.117.196 16 192.128.117.162
192.129.117.0 (253) 192.129.117.110 8 192.129.117.4
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