On Thu, Apr 25, 2019 at 5:25 AM isdtor <isdtor at gmail.com> wrote: > 09:02:02.911381 IP client.cisco-ipsla > dhcp-server.tftp: 56 RRQ > "linux-install/bootx64.efi" octet tsize 0 blksize 32768 > 09:02:02.911403 IP dhcp-server > client: ICMP dhcp-server udp port tftp > unreachable, length 92 > The “ICMP unreachable” should be a dead giveaway. . . You are missing the `firewall-cmd` configuration. See this guide: https://www.bo-yang.net/2015/08/31/centos7-install-tftp-server