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TFTP Bind to Specific Interface


 
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Operating Systems AIX TFTP Bind to Specific Interface
# 1  
Old 02-26-2020
TFTP Bind to Specific Interface

I have a NIM server and I was wondering if it's possible to have TFTP bind to a specific interface. Couldn't find anything in the man pages for tftpd that seems to indicate it's an option.
# 2  
Old 02-27-2020
If you are talking about the server, you can easily start tftpd on an open port which is open and you have permissions to bind to:

Code:
-p	Specifies the port number for the incoming request.

REF: IBM Knowledge Center


If you are talking about the client, then:

Code:
connect Host [Port]	Sets the remote host, and optionally the port, for file transfers. Since the TFTP protocol does not maintain connections between transfers, the connect subcommand does not create a connection to the specified host, but stores it for transfer operations. Because the remote host can be specified as part of the get or put subcommand, which overrides any host previously specified, the connect subcommand is not required.

REF: IBM Knowledge Center

It's all right there in the AIX man pages.
# 3  
Old 02-27-2020
Still tftpd would bind to all interfaces.
The Linux tftpd takes -a ip-addr:port but I think that won't work with the AIX tftpd.
Perhaps you can achieve an access restriction with tcp wrappers? But, as the name suggests, tcp wrappers work nicely with TCP, while tftpd works with UDP.
# 4  
Old 02-28-2020
Thanks for confirming the behavior of TFTP for AIX.

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