Firmware update using dnsmasq

I using using a Fedora 25 system and the RB260GSP port 1 is connected to my ethernet port (enp4s0).

Stopping firewall to allow DHCP/TFTP inbound

sudo systemctl stop firewalld

Firmware file needs specific name

cp swos-rb260-1.17.lzb /tmp/fw.260
cd /tmp

Starting dnsmasq with TFTP/bootp option

sudo dnsmasq --interface enp4s0 --bind-interfaces --no-daemon --port 0 --dhcp-range 192.168.1.100,192.168.1.200,12h  --dhcp-authoritative \
  --dhcp-host=00:00:00:00:01:01,192.168.1.101 --enable-tftp --tftp-root=`pwd` --log-queries --log-dhcp

Start firmware upgrade:

1. Power-off RB260GSP
2. Press-and-hold reset button
3. Power-on RB260GSP
4. Wait till ACT led starts flashing very fast (it first flashes slowly).