weird tftp problem

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higg
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weird tftp problem

Post by higg » 2021/10/13 11:11:55

Hello,
Centos 7, all latest updates. I installed tftp server according to instructions and don't understand what's wrong.
Client (from same subnet), either Linux or Windows, only able to create 0 size file, then timeout.
I turned off firewalld and put SELinux to disabled. No help.
I didn't understand, why I need to install both tftp-server and xinetd, first installed only tftp-server with same problem.
Installed xinetd as well, no luck, same problem.

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TrevorH
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Re: weird tftp problem

Post by TrevorH » 2021/10/13 11:53:08

Make sure that when you use firewall-cmd you enable the _service_ not the port - i.e. firewall-cmd --add-service=tftp NOT --add-port=69/udp
CentOS 6 died in November 2020 - migrate to a new version!
Info for USB installs on http://wiki.centos.org/HowTos/InstallFromUSBkey
CentOS 5 is dead, do not use it.
Full time Geek, part time moderator. Use the FAQ Luke

higg
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Joined: 2012/04/26 06:41:48

Re: weird tftp problem

Post by higg » 2021/10/13 12:16:01

thanks for reply, but I bet this is not related to firewall, as I wrote, I disabled it.

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TrevorH
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Re: weird tftp problem

Post by TrevorH » 2021/10/13 15:07:11

But you will want to re-enable it again at some point...
CentOS 6 died in November 2020 - migrate to a new version!
Info for USB installs on http://wiki.centos.org/HowTos/InstallFromUSBkey
CentOS 5 is dead, do not use it.
Full time Geek, part time moderator. Use the FAQ Luke

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jlehtone
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Re: weird tftp problem

Post by jlehtone » 2021/10/14 09:49:21

TrevorH wrote:
2021/10/13 15:07:11
But you will want to re-enable it again at some point...
... and the SELinux too.

The man tftpd of 'tftp-server' package mentions option --create and has a section about security.

Is tftp really the best option for writing to server?

higg
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Re: weird tftp problem

Post by higg » 2021/10/14 12:59:34

jlehtone wrote:
2021/10/14 09:49:21
Is tftp really the best option for writing to server?
I didn't ask is it best option or not. I asked why it's not working.

aks
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Re: weird tftp problem

Post by aks » 2021/10/17 19:04:30

I think you need to shed some light on this.

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I installed tftp server according to instructions
Whose instructions, and why?
Linux or Windows, only able to create 0 size file, then timeout.
So it doesn't get the data.
install both tftp-server and xinetd
Why did you install xinetd?

The question really is why do UDP ("not connected") transaction fail?

Perhaps trace UDP activity across your network (but just guessing here)

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