Nortel Web OS 10.0, Application Manual

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Web OS 10.0 Application Guide
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Chapter 10: Health Checking
212777-A, February 2002
FTP Server Health Checks
The Internet File Transfer Protocol (FTP) provides facilities for transferring files to and from
remote computer systems. Usually the user transferring a file needs authority to login and
access files on the remote system. This protocol is documented in RFC 1123.
In normal Internet operation, the FTP server listens on the well-known port number 21 for con-
trol connection requests. The client sends a control message which indicates the port number
on which the client is prepared to accept an incoming data connection request.
When a transfer is being set up, it is always initiated by the client. However, either the client or
the server may be the sender of data. Along with transferring user requested files, the data
transfer mechanism is also used for transferring directory listings from server to client.
N
OTE
– To configure the switch for FTP health checks, the FTP server must accept anony-
mous user.
Configuring the Switch for FTP Health Checks
Create any file name from an FTP server under FTP server directory, for example, .txt, .exe,
.bin and so forth.
To configure the switch for FTP health checks:
1. Select the real server group.
2. Set the health check type to FTP for the real server group.
3. Configure the health check content.
4. Apply and save your configuration.
>> # /cfg/slb/group 1
(Select a real server group)
>> # /cfg/slb/group 1/health ftp
>> # /cfg/slb/group 1/content
<filename>
>> # Real server group 1# apply
>> # Real server group 1# save