I need to configure point to point serial connections on 3 routers. One is a 2811 and the other 2 are 2801's. The Point to point lines are in place and are terminated with Kentrox 656 CSU/DSU's at each location. I was thinking of using ppp authentication. A LAN will connect at each router also. What is the best way to assign ip addresses to the serial interfaces? I am new at this.
If you use a /30 mask for the point to point connections you will use the least amount of IP address space. If this is in a lab environment you can pick any range - if this will connect to a production environment you will need to get valid IP's.
If your topology is like:
R1 serial 0 <----> serial 0 R2 serial 1 <---> s1 R3
that doews help, thanks, however, one other question, the 2811 has 2 serial WAN interface cards but shows 3 serial interfaces: s0/0/0, s0/1/0, and s0/2/0, is the s0/0/0 a logical interfaces and if so, what is it used for?
If you are also connecting LAN's to the routers and obviously using a different subnet like a prefix of /24. Make sure you are running a Routing protocol that supports VLSM so you can use different subnets to save address space. That way you are not locked into on mask throught the entire network.
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