IP unnumbered question

I got a small question over ip unnumberd.
I have two simple routers connected thru s0/0 interfaces
on one router i have configured the interfaces as below
1)Does ipunnumbered has got to do with the encapsulation of the poin to point
link.why is it not working with the default enc HDLC? when I give enc ppp on
both the interfaces the ping works fine between the routers else it doesnt...
Pls clarify...
 
R0#sh run int s0/0

Building configuration...
Current configuration : 76 bytes
!
interface Serial0/0
 ip unnumbered Loopback0
 serial restart_delay 0
end
R0#sh run int lo0
Building configuration...
Current configuration : 61 bytes
!
interface Loopback0
 ip address 1.1.1.4 255.255.255.0
end
======
R1#sh run int s0/0
Building configuration...
Current configuration : 85 bytes
!
interface Serial0/0
 ip address 1.1.1.2 255.255.255.0
 serial restart_delay 0
end
======

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Received on Wed Jan 27 2010 - 23:31:01 ART