after 3 seperate attempts to gain help for why my internet keeps cutting out I think I am at the source of the problem!
The internet will go after an amount of time and nothing will be able to connect apart from the router requiring a restart.
Upon bootup of my router I get the two errors:
%NAT: Error activating CNBAR on the interface Dialer0
%NAT: Error activating CNBAR on the interface BVI1
I have done some background reading and desyfered that these errors are caused by the use of DNS and RTSP protocols.
As I have both DNS and RTSP servers whose ports are open on my NAT I feel that this is the prime reason for my workstations not being able to communicate with the WAN after a while.
I have read on this forum that it is an IOS bug and to fix it I need to upgrade my IOS version to 12.4(7.14)T although I don't know if this was for the 857 or if it's compatible with both wired and wireless models. Currently I am using Version 12.4(6)T7.
I hold a guest account with cisco.com so I don't know if I will be able to download an upgrade?
Is there anything I can do?? This bug has meant that I needed to restart the router 4x in the last 2 or 3 days!! :-(