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Forum Discussion
routes: how to
if my isp has given me three blocks to use. i already have the primary block setup using classical routing so my computers on the lan-side can use that. if i have these two additional blocks to use ...
When you withhold information, you make it difficult for us to assist.
When an ISP specifies a network as aa.aa.aa.aa/27, that describes the network and specifies the subnet mask, the network address, the ip addresses available for use on hosts and the network broadcast address - the gateway will be one of the available addresses in the block, you get to choose which, but, there must be a host at that address handling the gateway tasks (usually a router).
You already have classical routing setup, so you're not using network address translation, you haven't given us ANY ip information, so we have to make assumptions - you have three blocks aa.aa.aa.aa/27, bb.bb.bb.bb/28 & cc.cc.cc.cc/xx - so you have three separate networks, you'll therefore need three routers to link them all into one - unless - you're willing to use one physical network, with three logical networks AND the router you are using supports multi-homing - not really the best approach if you're using public ranges, which I would have to assume you are, since you're using address blocks allocated by the ISP.
To answer your questions - destination is exactly that - the address of the network you are sending the traffic to, and the metric is a number used to influence route selection, usually the number of hops (router interconnections) between the network you are on and the destination - I say usually, because the network designer can use the metric to force route selection based on any variable of his choice, for example to force traffic to use a lower cost network link rather than a more expensive one, or a faster link over a slower one.
In case you haven't already realised it - this is a network design project and you seem to be in over your head -you either call in a professional, or, if this is a hypothetical situation (you started your question with IF), you get yourself a good book on basic routing and start reading.
When an ISP specifies a network as aa.aa.aa.aa/27, that describes the network and specifies the subnet mask, the network address, the ip addresses available for use on hosts and the network broadcast address - the gateway will be one of the available addresses in the block, you get to choose which, but, there must be a host at that address handling the gateway tasks (usually a router).
You already have classical routing setup, so you're not using network address translation, you haven't given us ANY ip information, so we have to make assumptions - you have three blocks aa.aa.aa.aa/27, bb.bb.bb.bb/28 & cc.cc.cc.cc/xx - so you have three separate networks, you'll therefore need three routers to link them all into one - unless - you're willing to use one physical network, with three logical networks AND the router you are using supports multi-homing - not really the best approach if you're using public ranges, which I would have to assume you are, since you're using address blocks allocated by the ISP.
To answer your questions - destination is exactly that - the address of the network you are sending the traffic to, and the metric is a number used to influence route selection, usually the number of hops (router interconnections) between the network you are on and the destination - I say usually, because the network designer can use the metric to force route selection based on any variable of his choice, for example to force traffic to use a lower cost network link rather than a more expensive one, or a faster link over a slower one.
In case you haven't already realised it - this is a network design project and you seem to be in over your head -you either call in a professional, or, if this is a hypothetical situation (you started your question with IF), you get yourself a good book on basic routing and start reading.
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