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The TFTP client and server are fully compatible with TFTP option support (tsize, blocksize and timeout), which allow the maximum performance when transferring the data. ... progress bars and early acknowledgments enhance usefulness and throughput of the TFTP protocol for both client and server.
https://www.tftp-server.com/tftp-server-help/tftp-protocol.html
In case one of the sides does not receive the expected packet during the timeout, the other side resends the packet. TFTP Options. The TFTP client can request the server on the parameters of file transmission change by means of the TFTP options. The server can accept or reject one or another TFTP option, requested by the client.
https://www.tftp-server.com/tftp-version-history.html
Support of files transmission through firewalls is improved - now all files can be transmitted with use of only one UDP port. Possibility of remote server administration is added. You can remotely configure the server, examine current TFTP sessions and server work logs. Changing of the server settings does not require restart of the server.
https://www.ibm.com/support/knowledgecenter/en/ssw_aix_71/t_commands/tftpd.html?origURL=ssw_aix_71/com.ibm.aix.cmds5/tftpd.htm
The tftpd daemon should be controlled using the System Management Interface Tool (SMIT) or by changing the /etc/inetd.conf file. Entering tftpd at the command line is not recommended. The tftpd server is a multithreaded application and is able to handle option negotiation (RFC2349). This capability allows a client to negotiate a file size to be ...
https://www.netadmintools.com/html/tftpd.man.html
This version of tftpd supports RFC 2347 option negotation. Currently implemented options are blksize (RFC 2348), blksize2 (nonstandard), tsize (RFC 2349), and timeout (RFC 2349). The nonstandard blksize2 TFTP option is functionally identical to the blksize option, with the additional constraint that the blocksize is constrained to be a power of 2.
https://www.ibm.com/support/knowledgecenter/en/ssw_aix_72/t_commands/tftp.html
The TFTP server must support RFC2349 for option negotiation to take place. ... the tftpd daemon is not able to recognize the existence of the file and allows access to the entire system. For more information, ... Enables the tsize option negotiation with the server. This allows the file size to be known before the transfer starts.
https://manpages.debian.org/stretch/tftpd-hpa/tftpd.8.en.html
tftpd - Trivial File Transfer Protocol server ... Set the transfer block size to anything less than or equal to the specified option. This version of tftpd can support any block size up to the theoretical maximum of 65464 bytes. ... This version of tftpd only supports the tsize option …
https://thwack.solarwinds.com/thread/23944
In your particular case, the PXE-booted machine is the TFTP client, requesting a file (the Windows PE image) from the SolarWinds TFTP Server. Since the block size option is client-initated, and the PXE-booted machine is the TFTP client, you would need to look for a TFTP block size option and set it appropriately on each of your PXE-booted machines.
https://support.f5.com/csp/article/K10819
Additionally, the tftpd daemon must support the tsize option. For example, in Debian, the tftpd package does not support the tsize option and therefore is not suitable for use in a PXE environment; instead, use the tftpd-hpa package. Mount the product ISO file to a directory and then copy the required files to your tftp root directory. For example:
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