troubleshooting Question

2 isp's one router

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it_gsr asked on
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Site A has two internet connections from two isp’s and one router. The router is   Cisco 1700 series connected to a PIX 515e. Site A has an MPLS connection from ISP 1 to Site B which also acts as it’s internet connection. The source of ISP1’s internet is at site B. Site A  has two ethernet interfaces. The Fast0 is connected to  the MPLS link from ISP 1 whiles ethernet0 is connected to ISP 2. ISP 2 connection is via VSAT on the serial interface. We would like to create a failover situation at site A so that if the MPLS link fails, the system should be able to switch to the VSAT
for internet at Site A.

The config below only works if the weight on the default route on the serial0 is manually increased to the same level as the default route on and the gateway on the Domain controller acting as DHCP is changed to the internal IP of the firewall.
How can the router's config made to work automatically without any manual intervention

Building configuration...

Current configuration : 957 bytes
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
hostname XXXX
enable secret 5 $1$eLc/$3HMpM7vIesR8cH2dyXJ0k/
enable password ****
ip subnet-zero
ip name-server isp1
ip name-server isp1
ip name-server isp2
interface Ethernet0
 ip address A.B.C.D
interface FastEthernet0
 ip address secondary
 ip address
 speed auto
interface Serial0
 description Link to Internet
 ip address E.F.G.H
 no keepalive
 no fair-queue
 no cdp enable
ip classless
ip route Serial0 2
ip route
no ip http server
snmp-server community public ****
line con 0
line aux 0
line vty 0 4
 password *******
no scheduler allocate
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