Hi, I have a 7500 series router. There are three interfaces, one is serial, FE and atm. And only ATM port is using private IP. I have one PC with ATM adapter connect to the ATM port through a ATM switch (non-cisco). I can Ping from PC to the ATM port, but I cannot ping the other two interfaces, even I have added OSPF. What is the problem? Is the IOS do not let me do it this way because of the private address? Thanks you for your help Regards, Raymond Mak _________________________________ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]