Yo utilizo el servidor tftp gratuito de SolarWinds y no tengo ningun problema en guardar y recuperar la configuracion del Netgear CG3100D tanto la seccion permanente como la dinamica como puedes ver aqui:
CG3100D/NonVol> tftp_write perm 192.168.123.11 071110permanet.bin
Opening file '071110permanet.bin' on 192.168.123.11 for writing...
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (0)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (0)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (1)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (1)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (2)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (2)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (3)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (3)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (4)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (4)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (5)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (5)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (6)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (6)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (7)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (7)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (8)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (8)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (9)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (9)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (10)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (10)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (11)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (11)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (12)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (12)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (13)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (13)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (14)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (14)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (15)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (15)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (16)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (16)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (17)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (17)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (18)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (18)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (19)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (19)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (20)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (20)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (21)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (21)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (22)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (22)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (23)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (23)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (24)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (24)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (25)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (25)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (26)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (26)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (27)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (27)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (28)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (28)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (29)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (29)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Received
block number: (30)
[10:20:21 11/07/2010] [ConsoleThread] Tftp Client::Send: (Tftp Client) Expected
block number: (30)
The settings were successfully written to the TFTP server.
2010-11-07 10:18:58,615 [Main UI Thread] INFO SolarWinds.Logging.LoggingHelper - ******************************************
2010-11-07 10:18:58,615 [Main UI Thread] INFO SolarWinds.Logging.LoggingHelper - startup
2010-11-07 10:18:58,615 [Main UI Thread] INFO SolarWinds.Logging.LoggingHelper - domingo, 07 de noviembre de 2010 10:18:58
2010-11-07 10:18:58,615 [Main UI Thread] INFO SolarWinds.Logging.LoggingHelper - NetBIOS Computer: DENPERE-2
2010-11-07 10:18:58,615 [Main UI Thread] INFO SolarWinds.Logging.LoggingHelper - OS: Microsoft Windows NT 5.1.2600 Service Pack 3
2010-11-07 10:18:58,615 [Main UI Thread] INFO SolarWinds.Logging.LoggingHelper - CPU count: 2
2010-11-07 10:18:58,631 [Main UI Thread] INFO SolarWinds.Logging.LoggingHelper - IP Address: 192.168.123.11
2010-11-07 10:18:58,631 [Main UI Thread] INFO SolarWinds.Logging.LoggingHelper - IP Address: 5.174.246.17
2010-11-07 10:18:58,631 [Main UI Thread] INFO SolarWinds.Logging.LoggingHelper - Current user: NT AUTHORITY\SYSTEM
2010-11-07 10:18:58,631 [Main UI Thread] INFO SolarWinds.Logging.LoggingHelper - Current Culture: Spanish (Spain) - es
2010-11-07 10:18:58,631 [Main UI Thread] INFO SolarWinds.Logging.LoggingHelper - Current UI Culture: Spanish (Spain) - es
2010-11-07 10:18:58,631 [Main UI Thread] INFO SolarWinds.Logging.LoggingHelper - Is Running as Administrator: True
2010-11-07 10:18:58,631 [Main UI Thread] INFO SolarWinds.Logging.LoggingHelper - ******************************************
2010-11-07 10:18:58,693 [6] INFO TFTPServer.Service.TFTPSettings - RootDir: 'C:\TFTP-Root'
2010-11-07 10:18:58,693 [6] INFO TFTPServer.Service.TFTPSettings - IsReceiveAllowed: True
2010-11-07 10:18:58,693 [6] INFO TFTPServer.Service.TFTPSettings - IsTransmitAllowed: True
2010-11-07 10:18:58,693 [6] INFO TFTPServer.Service.TFTPSettings - AllowAll: True
2010-11-07 10:18:58,693 [6] INFO TFTPServer.Service.TFTPSettings - SIPList:
2010-11-07 10:18:58,693 [6] INFO TFTPServer.Service.TFTPSettings - EIPList:
2010-11-07 10:18:58,693 [6] INFO TFTPServer.Service.TFTPSettings - UsedNIC: Any:All
2010-11-07 10:18:58,693 [6] INFO TFTPServer.Service.TFTPSettings - RenameExistingFiles: False
2010-11-07 10:19:03,427 [6] INFO TFTPServer.Service.TFTPServer - Server Started...
2010-11-07 10:19:03,427 [6] INFO TFTPServer.Service.TFTPServer - TFTPServer.Service.TFTPServer, hash 39774547 was marshaled.
2010-11-07 10:19:03,459 [6] INFO TFTPServer.Service.ConnectionPool - Starting service...
2010-11-07 10:19:03,474 [6] INFO TFTPServer.Service.ConnectionPool - Service started.
2010-11-07 10:20:10,349 [3] INFO TFTPServer.Service.PacketParser.RequestPacket - Received request packet, file name: 071110permanet.bin, transfer mode: binary, block size: , tsize: , timeout:
2010-11-07 10:20:10,396 [6] INFO TFTPServer.Service.ConnectionPool - Beginning processing PUT request from 192.168.123.254:1045, file name: 071110permanet.bin, transfer mode: binary,
