Hi All,
I have very simple question, Can we use duplicate ips on serial interfaces
among them seleves although we cannot use duplicate ip on serial with
Ethernet(lan interface) or loopback interface.


My topology is like this 
  
Client router server router(connected back to back)
  2 interfaces           2 inetrfaces 
  

these routers connected back to back 
  

configuration 
int serial 0/0 
encap hdlc 
ip address 1.1.1.1 255.255.255.0 

int serial 0/1 
ip address 1.1.1.1 255.255.255.0 
encap hdlc 

  
  
now if all the two interfaces of serial even if given duplicate ip among
themselves works fine. no error from cli .interfaces are up
and i am able to ping remote side. 
  


The ques is that

1) Lan interface also was in different subnet but serial interface 
doesnot accept that ips as duplicate or of loopback 

2)What Implication such have on my design ,any limitation it has 

Does this type of design can be used,
 
This is small thing is confusing me about ip.

Thanx  in advance

  



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