Problem with device, can ping, but not tftp to get from server

On a Ubuntu GNS3 VM, I am trying to setup an active online-device. Here is the sketch of the Ifconfig on this GNS3 VM host: docker0: flags=4099 mtu 1500 inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255 ether 02:42:7f:07:8c:49 txqueuelen 0 (Ethernet) ... ens160: flags=4163 mtu 1500 inet 10.31.1.116 netmask 255.255.240.0 broadcast 10.31.15.255 ... gns3tap0-1: flags=4163 mtu 1500 inet6 fe80::60a2:8ff:fe4d:5672 prefixlen 64 scopeid 0x20 ether 62:a2:08:4d:56:72 txqueuelen 1000 (Ethernet) ... lo: flags=73 mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 1000 (Local Loopback) ... virbr0: flags=4163 mtu 1500 inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255 ... And also on this VM, I have a tftp service started, that will provides the device license files for the incoming requests. I have double-checked and this tftp service is up and working OK. And here is the diagram of my GNS3 Project that has been setup on this GNS3 VM. As you may find out, there is connection sequence as: **cloud Cisco Router Switch -> X-1, which is my device at the end**. From my device console, I was able to ping outside network and VM, but somehow, I could not tftp the license file from it. here is my device console log: # # execute ping 8.8.8.8 PING 8.8.8.8 (8.8.8.8): 56 data bytes 64 bytes from 8.8.8.8: seq=0 ttl=115 time=16.352 ms 64 bytes from 8.8.8.8: seq=1 ttl=115 time=12.175 ms 64 bytes from 8.8.8.8: seq=2 ttl=115 time=18.031 ms 64 bytes from 8.8.8.8: seq=3 ttl=115 time=14.223 ms --- 8.8.8.8 ping statistics --- 4 packets transmitted, 4 packets received, 0% packet loss round-trip min/avg/max = 12.175/15.195/18.031 ms # execute ping 10.31.1.116 PING 10.31.1.116 (10.31.1.116): 56 data bytes 64 bytes from 10.31.1.116: seq=0 ttl=63 time=11.037 ms 64 bytes from 10.31.1.116: seq=1 ttl=63 time=17.924 ms 64 bytes from 10.31.1.116: seq=2 ttl=63 time=14.249 ms --- 10.31.1.116 ping statistics --- 3 packets transmitted, 3 packets received, 0% packet loss round-trip min/avg/max = 11.037/14.403/17.924 ms # execute bios get 10.31.1.116 FX200FTQ2109C0PU.rom tftp: timeout Get BIOS file failed... Any idea what could be wrong ? This is the first time I am trying to setup the devices in such environment. Thanks for the help.