just to let you know that you  can set a loopback on a Cisco router from the 
router ?

 You must be in the priv mode not user mode to put the router in loopback.  

  Router# 
  Router#conf ter  ( hit enter )
  Router(config)#int s0 ( hit enter )
  Router(config-if)#LOOPBACK (hit enter )
  Router(config-if)#end (hit enter )
  Router#sho int s0 ( you will now see the serial interface in loopback)

  To remove the loopback from the serial interface just reload the router or 
do this:

  
  Router# 
  Router#conf ter  ( hit enter )
  Router(config)#int s0 ( hit enter )
  Router(config-if)#NO LOOPBACK (hit enter )
  Router(config-if)#end (hit enter )
  Router#sho int s0 ( you will now see the serial interface out of the 
loopback)



Brian
Email Address [EMAIL PROTECTED]

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