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

}}}