Pix with Internet leased line and adsl as backup

HI , could Some help me out , I have a Pix Firewall connected to a

1800 Series router with Internet leased line, I am able to connect to internet and through VPN connect remote desktop with the server for the many applications. My concerns are
  1. The remote desktop gets disconnected frequently, is there any problem with the configuration.
  2. I have an ADSL line and Cisco 837 Router how can i use this router to act as a backup for the laesed line

Thanks and Regards

The Configuration are as follows

interface ethernet0 10baset interface ethernet1 10baset nameif ethernet0 outside security0 nameif ethernet1 inside security100 hostname pix fixup protocol ftp 21 fixup protocol h323 h225 1720 fixup protocol h323 ras 1718-1719 fixup protocol http 80 fixup protocol ils 389 fixup protocol rsh 514 fixup protocol rtsp 554 fixup protocol sip 5060 fixup protocol sip udp 5060 fixup protocol skinny 2000 fixup protocol smtp 25 fixup protocol sqlnet 1521 names access-list inside_outbound_nat0_acl permit ip 192.1 68.2.0 access-list outside_cryptomap_20 permit ip pager lines 24 mtu outside 1500 mtu inside 1500 ip address outside A.B.C.114 ip address inside ip audit info action alarm ip audit attack action alarm pdm location outside pdm location inside pdm history enable arp timeout 14400 global (outside) 10 interface nat (inside) 0 access-list inside_outbound_nat0_acl nat (inside) 10 0 0 route outside A.B.C.113 1 timeout xlate 3:00:00 timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 1:00:00 timeout h323 0:05:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00 timeout uauth 0:05:00 absolute aaa-server TACACS+ protocol tacacs+ aaa-server RADIUS protocol radius aaa-server LOCAL protocol local

no snmp-server contact snmp-server community public no snmp-server enable traps floodguard enable sysopt connection permit-ipsec crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac crypto ipsec transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac crypto map outside_map 20 ipsec-isakmp crypto map outside_map 20 match address outside_cryptomap_20 crypto map outside_map 20 set pfs group2 crypto map outside_map 20 set peer public ip crypto map outside_map 20 set transform-set ESP-3DES-SHA crypto map outside_map 20 set security-association lifetime seconds

3600 kilobyt es 100000 crypto map outside_map interface outside isakmp enable outside isakmp key ******** address public ip netmask no- xauth no-con fig-mode isakmp policy 20 authentication pre-share isakmp policy 20 encryption 3des isakmp policy 20 hash sha isakmp policy 20 group 2 isakmp policy 20 lifetime 28800 telnet timeout 5 ssh timeout 5 console timeout 0 terminal width 80 Cryptochecksum:d0eee9eae59e01ef0c2b304f9b93c6fb : end pix# sh runn



! ! interface FastEthernet0/0

ip address A.B.C.113 speed 10 half-duplex no mop enabled ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto ! interface Serial0/0/0 ip address X.Y.Z.W ! router rip redistribute connected network A.B.C.0 network X.Y.Z.0 ! ip classless ip route Serial0/0/0 ! ip http server ip http access-class 23 ip http authentication local ip http timeout-policy idle 60 life 86400 requests 10000 ! access-list 23 permit dialer-list 1 protocol ip permit ! control-plane !

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