HP 10Base-T Hub 24M Manual page 90

Configuration Reference
Subnet Mask. Indicates the subnet mask assigned to the hub. The subnet
mask is a bit mask defining the subnet portion of the IP Address in the
same format as the IP Address.
Gateway. Indicates the IP Address of the nearest router in the network.
If there are no routers, the address of the network management station is
commonly used.
Time to Live. Indicates the number of IP routers a packet is allowed to
cross before the packet is discarded. The default value is 32. Increase
this value if the hub is managed from a network management station that
is more than 32 routers away. The maximum allowable value is 255.
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