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how to enable debug interface null 0 ???

hi ,

ihave a router that has  a defualt route to another router and the users connetc the router as pppoe client .

as we know , in this case it is god to put null 0 route on the router to prevent loops .

i typed

debup interface null0

and i made aping to someone not connected to router but im not facing any output of debug result .

actually im worry about null 0 interface because i monitored abut 500k traffic to that interface and i want to see the hits to that interface .

when i type : debug interface null 0 ,

B1#debug interface null 0

Condition 1 set

B1#sh deb

B1#sh debugging

Condition 1: interface Nu0 (1 flags triggered)

        Flags: Nu0

B1

im entering usign telnet and i typed terminal monitor but the same issue   .

i thik the issue is from the condition , i dont know what condition is done above ??!!!!!

regards

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