Why the responses sent from the tftp server are not received successfully to the tftp client ?
Issue
tftp clientis not receiving any reply fromtftp server.- When checked in tcpdump, can see that
tftp serveris responding properly but those responses are not reachingtftp client. - Below is the tcpdump from
tftp serverwhere it is seen that server is responding to the requests by sendingOption Acknowledgement:
NO. Time Source Destination Protocol Info
1 0.000000 66.180.X.X 168.215.X.X TFTP Read Request, File: motd\000, Transfer type: octet\000, tsize\000=0\000, rollover\000=0\000
2 0.020466 168.215.X.X 66.180.X.X TFTP Option Acknowledgement, tsize\000=40\000
3 1.021749 168.215.X.X 66.180.X.X TFTP Option Acknowledgement, tsize\000=40\000
4 3.023881 168.215.X.X 66.180.X.X TFTP Option Acknowledgement, tsize\000=40\000
5 4.999208 66.180.X.X 168.215.X.X TFTP Read Request, File: motd\000, Transfer type: octet\000, tsize\000=0\000, rollover\000=0\000
6 5.001073 168.215.X.X 66.180.X.X TFTP Option Acknowledgement, tsize\000=40\000
7 6.002286 168.215.X.X 66.180.X.X TFTP Option Acknowledgement, tsize\000=40\000
8 7.028005 168.215.X.X 66.180.X.X TFTP Option Acknowledgement, tsize\000=40\000
9 8.004478 168.215.X.X 66.180.X.X TFTP Option Acknowledgement, tsize\000=40\000
10 9.999266 66.180.X.X 168.215.X.X TFTP Read Request, File: motd\000, Transfer type: octet\000, tsize\000=0\000, rollover\000=0\000
11 10.001341 168.215.X.X 66.180.X.X TFTP Option Acknowledgement, tsize\000=40\000
- Below is the tcpdump captured from
tftp clientwhere only generated requests are seen but no responses OROption Acknowledgementsent by server are not seen:
NO. Time Source Destination Protocol Info
1 0.000000 66.180.X.X 168.215.X.X TFTP Read Request, File: motd\000, Transfer type: octet\000, tsize\000=0\000, rollover\000=0\000
2 4.999331 66.180.X.X 168.215.X.X TFTP Read Request, File: motd\000, Transfer type: octet\000, tsize\000=0\000, rollover\000=0\000
3 9.999477 66.180.X.X 168.215.X.X TFTP Read Request, File: motd\000, Transfer type: octet\000, tsize\000=0\000, rollover\000=0\000
Environment
- Red Hat Enterprise Linux 6.2
kernel-2.6.32-220.el6.x86_64vmxnet3driver version: 1.1.18.0-k-NAPItftpclient server communication.
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