ifconfigĮth0 Link encap:Ethernet HWaddr 0a:0c:c9:b1:fa:43 I can successfully SSH ( port 22 ) to my 192.168.1.10 server using the external router ip ( 129.196.194.210 ) so my port forwarding is working. I also setup my router to use the server ( 192.168.1.10 ) as the DMZ: I have forwarded port 69 ( UDP ) to my server at 192.168.1.10 within the router config as shown here:

My TFTP Server is configured ( via the /etc/default/tftp-hpa ) as follows: cat /etc/default/tftpd-hpa

I want to be able to export my directory beyond my router to the external network. This is the case where both server and client are behind the router and on the 192.168.1.x network. I can boot just fine using the u-boot bootloader while passing the local ( 192.168.1.10 ) ip address of the TFTP server running on the host to the target board ( which has ip address 192.168.1.3 ). I'm not able to reliably reproduce this, but I have hit it a few times on different machines.I am using Ubuntu as the host machine for my embedded Linux board with the tftp-hpa service. Install tftp package, enable/start service, then reboot. This fixes it, but I'm afraid if there's a package upgrade the changes will be reverted. $ cat /usr/lib/systemd/system/tftp.socketĭescription=Tftp Server Activation Socket I reconfigured /usr/lib/systemd/system/tftp.socket to listen exclusively on ipv4: May 23 17:38:10 host systemd: Starting Tftp Server Activation Socket. May 23 17:38:10 host systemd: Unit tftp.socket entered failed state. May 23 17:38:10 host systemd: Failed to listen on Tftp Server Activation Socket. May 23 17:38:10 host systemd: tftp.socket failed to listen on sockets: Address family not supported by protocol Loaded: loaded (/usr/lib/systemd/system/tftp.socket enabled vendor preset: disabled)

tftp.socket - Tftp Server Activation Socket.

On install of the tftp package the service starts correctly binding to 0.0.0.0:69 but after reboot or service restart it tries to go to IPV6, which fails (and IPV6 is disabled on my box): 0013342: tftp systemd socket service tries to bind to IPV6 address when system is using IPV4

Centos 7 tftp server