Thanks for replying.
Yes, I did mean SDM, I have no idea where I got CDM from!
Yes, I am using the "Save" button in SDM and it does appear to save but when the router is powered off then back on, the configuration is lost. Even the passwords are gone and the LAN configurations.
Here is the result from using "Show Version"
Cisco IOS Software, C831 Software (C831-K9O3SY6-M), Version 12.3(7)XR2, RELEASE SOFTWARE (fc1)
Synched to technology version 12.3(7.11)T1
Technical Support: »www.cisco.com/techsupport
Copyright (c) 1986-2004 by Cisco Systems, Inc.
Compiled Fri 25-Jun-04 17:56 by ealyon
ROM: System Bootstrap, Version 12.2(11r)YV5, RELEASE SOFTWARE (fc1)
ROM: Cisco IOS Software, C831 Software (C831-K9O3SY6-M), Version 12.3(7)XR2, RELEASE SOFTWARE (fc1)
Router uptime is 1 minute
System returned to ROM by power-on
System image file is "flash:c831-k9o3sy6-mz.123-7.XR2.bin"
This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.
A summary of U.S. laws governing Cisco cryptographic products may be found at:
If you require further assistance please contact us by sending email to
Cisco C831 (MPC857DSL) processor (revision 0x500) with 58983K/6553K bytes of memory.
Processor board ID FHK101224P2 (1431813270), with hardware revision 0000
CPU rev number 7
3 Ethernet interfaces
4 FastEthernet interfaces
128K bytes of NVRAM.
12288K bytes of processor board System flash (Read/Write)
2048K bytes of processor board Web flash (Read/Write)
Configuration register is 0x142
Thanks for any advice you can provide.