Security Feature Configuration; Security Feature Introduction - Edge-Core ES4626 User Manual

start. If the system file and system start up file upgrade through FTP fails, please try
to upgrade again or use the BootROM mode to upgrade.
2.5.5.2 TFTP Troubleshooting
When upload/download system file with TFTP protocol, the connectivity of the link
must be ensured, i.e., use the "Ping" command to verify the connectivity between the
TFTP client and server before running the TFTP program. If ping fails, you will need to
check for appropriate troubleshooting information to recover the link connectivity.
The following is the message displays when files are successfully transferred.
Otherwise, please verify link connectivity and retry "copy" command again.
nos.img file length = 1526021
read file ok
begin to send file,wait...
file transfers complete.
close tftp client.
The following is the message displays when files are successfully received.
Otherwise, please verify link connectivity and retry "copy" command again.
begin to receive file,wait...
recv 1526037
************************
write ok
transfer complete
close tftp client.
If the switch is upgrading system file or system start up file through TFTP, the switch must
not be restarted until "close tftp client" is displayed, indicating upgrade is successful,
otherwise the switch may be rendered unable to start. If the system file and system start
up file upgrade through TFTP fails, please try upgrade again or use the BootROM mode
to upgrade

2.6 Security Feature Configuration

2.6.1 Security Feature Introduction

Before introducing the security features, we here first introduce the DoS. The DoS is
short for Denial of Service, which is a simple but effective destructive attack on the
internet. The server under DoS attack will drop normal user data packet due to non-stop
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