Problem on set up Static IP

[satimis]

Hi all,

Ubuntu 14.04

Previously before adding a router following entry on
/etc/network/interfaces worked to connect Internet without problem;

auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
  address  aaa.aaa.aaa.aaa
  dns-nameservers bbb.bbb.bbb.bbb ccc.ccc.ccc.ccc
  netmask  255.255.255.0
  broadcast  aaa.aaa.aaa.15
  gateway  aaa.aaa.aaa.13

# add bridge ports
auto br0
iface br0 inet static
  address  192.168.0.100
  dns-nameservers bbb.bbb.bbb.bbb ccc.ccc.ccc.ccc
  network  192.168.0.0
  netmask  255.255.255.0
  broadcast  192.168.0.255
  gateway  192.168.0.1
  bridge_ports  eth0
  bridge_fd  9
  bridge_hello  2
  bridge_maxage  12
  bridge_stop  off

The addresses "aaa.aaa.aaa.aaa bbb.bbb.bbb.bbb ccc.ccc.ccc.ccc 255.255.255.0 aaa.aaa.aaa.15 aaa.aaa.aaa.13' all were provided by ISP.

I haven't used the captioned settings at least more than ONE year after adding a router.

I just tested it lately and found it didn't work. Please help.

Thanks in advance.

Regards
satimis