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i rewiew my router configuration and i found :-

ip route 0.0.0.0 0.0.0.0 Serial1/0:1

ip route 10.0.14.31 255.255.255.255 FastEthernet0/0

what we mean by two command ??? and what we mean by 255.255.255.255 and 0.0.0.0 0.0.0.0

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1 Answer

up vote 4 down vote accepted

Let's dissect this one line at a time.

ip route 0.0.0.0 0.0.0.0 Serial1/0:1

The first ip route command will dictate Serial1/0:1 as a default interface for all packet routing.

ip route 10.0.14.31 255.255.255.255 FastEthernet0/0

The second ip route command dictates that any network packet that is seeking for a destination address that's within the range of 10.0.14.31/255.255.255.255 will be routed through FastEthernet0/0

The value of 255.255.255.255 is a subnet mask value. It is a deterministic value that defines that scope of the network that your router has been assigned to handle.

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I would just add to to Michael's excellent response that the mask 255.255.255.255 is called a host mask and specifies a single network device. –  Peter Nov 25 '10 at 12:20
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