Configuration of Broadband coonection on router

Dear Team,
I am having two ISp in my office one is Hathway leased line and another is TATA broadband.
recently i have purchased cisco 1941 router.in which i have configured the hathway as a primary isp.after all the configuration users can get the
internet through router . i,e from hathway.
now my issue is that,i am having TATA broadband connection,which is configured on Netgear ADSL router with the username and password.dont have static ip for broadband.
now i want to configure this connection on router through ethernet .
so that i ahev given the 192.168.2.2 ip to modem and 192.168.2.1 ip to router fast ethernet port.
also give the default route 0.0.0.0 0.0.0.0 192.168.2.2 200
still i amnot getting the internet through tata,if hathway goes down

Below is the configuration of router:
interface GigabitEthernet0/0
ip address 125.99.113.2 255.255.255.252
ip nat outside
ip virtual-reassembly in
duplex auto
speed auto
interface GigabitEthernet0/1
ip address 192.168.1.254 255.255.255.0
ip nat inside
ip virtual-reassembly in
duplex auto
speed auto
interface FastEthernet0/0/0
description connected to tata ISP on netgear DSL modem
ip address 192.168.2.1 255.255.255.0
ip nat outside
ip virtual-reassembly in
duplex auto
speed auto
interface FastEthernet0/0/1
no ip address
shutdown
duplex auto
speed auto
ip forward-protocol nd
no ip http server
no ip http secure-server
ip nat inside source list 100 interface GigabitEthernet0/0 overload
ip nat inside source static 192.168.1.119 125.99.96.166
ip route 0.0.0.0 0.0.0.0 125.99.113.1
ip route 0.0.0.0 0.0.0.0 192.168.2.2 200
access-list 100 permit ip 192.168.1.0 0.0.0.255 any
my internal network is 192.168.1.0 /24 with the gateway 192.168.1.254
please assist me on the same

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