I hv a P-t-P with encap as hdlc, A and B. Let say that i take a loopback from B the remote end. So In this case i see that serial and line is up and (looped) @ A end. Now i will ping my own interface i.e A's IP and will get ping response.
But with ppp as encap, this is not true. when loop is taken, the local end shows as serial up and line down, and when i ping my own interface, i dont see any responce!!!!
On ppp encapsulation u cannot ping the self interface in looped condition. only u will get the following state" serial 0 line protocol down(looped).This is the usual feature of PPP enacpsulation. If u want to test the link in looped condition, u need to change the encapsulation to hdlc and do it.
This is due to PPP protocol implementation. It uses magic numbers with which it can find whenever the line looped back, and make line protocol down. It can find out loop when Input and Output magic numbers are same.
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