I am trying to upgrade a 2821 via tftp to an IOS image that is 34MB. My "old reliable" tftp cannot handle files larger than 16MB so I donwload and tried two other servers. I tried SolarWinds and a server by Whitehorn. In both cases the router begins to download the IOS but it seems to keep going after downloading the IOS's 34MB and it begins the download again. It seems to loop in this manner until the flash is full and then the xfer quits complaing of the full flash! Is this a problem on the router end or should I look for yet another large file capable tftp server?
The best bet for the file transfers ranging more than 16MB would be FTP.
Do find this link which talks about the limitation(bug) in detail..