Nortel Networks 9150 - Manual (Page 394)

364 Remote Gateway 9150 Installation and Administration Guide
Troubleshooting Standard 3.1
Unsuccessful PING options
If the PING was unsuccessful:
1 Ensure you have entered the IP address, subnet mask, and default
gateway correctly.
2 PING the gateway to see if it responds.
3 Contact your data network administrator if the PING still does not work.
ATTENTION!
It is possible to successfully PING a device on the network
and still not be able to log on to that device. If you log on to
a device (a Remote Gateway 9150 unit) using a serial
connection and neglect to log off, you may be able to
successfully PING the device but be unable to establish a
Telnet connection to it. (The device believes itself to be
busy.)
If you cannot log on to a device after a successful PING,
access the serial port and ensure that you are not logged on to
the device through this port.