02-14-2006 05:43 AM - edited 03-05-2019 11:47 AM
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.
02-14-2006 05:43 AM
Hello,
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
Then you can do"
R1
int s0
ip address 192.168.1.1 255.255.255.252
R2
int s0
ip address 192.168.1.2 255.255.255.252
int s1
ip address 192.168.1.5 255.255.255.252
R3
int s2
ip address 192.168.1.6 255.255.255.252
Hope that helps.
Regards,
James
02-21-2006 02:58 PM
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?
02-21-2006 06:31 PM
Hello,
Can you upload the output from a show diag from the 2811? Thanks.
Regards,
James
02-21-2006 10:23 PM
Just wanted to add a note.
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.
Hope this helps and please rate!!
Scott
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