Help me with Dual ISP internet connection (Dual wan) on Cisco Router 1811

This project should be within 1 hour for people know how to deal with Cisco 1811 router.

My Internet moden has connection issues, the Internet cut off periodically on seconds, but it ruins my applications that depend on it. So, my solution is, to have 2 ISP for internet provide. If one cuts off the other could resume, smooth, and no gap in data communication.

I need people with Cisco experience, especially familiar with 1811 router to help me out. Because it is expected to use "IOS NAT LOADBALANCING" to switch 2 ISPs

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=============Ok, so now is my hardware setup.===============

There are 3 laptops, all installed with Teamviewer/Anydesk so that somebody could connect onto those computers to do some operations.

Computer 1: Console port. laptop which will be connected to the Internet All the time, and that laptop will be connected to the Console port of Cisco 1811 so that you can type commands remotely

Computer 2: will be on request to connect either on ISP 1, or ISP 2. or on Lan 1 or Lan 2 of the router.

Computer 3: will be on request to connect either on ISP 1, or ISP 2. or on Lan 1 or Lan 2 of the router.

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If you know how to setup 2 ISPs on Router 1811, please talk to me. Thank you. The following is the error log from my internet connection cut off. You may find "eth4" is the internet connection, and down just a few seconds (22:31:21 - 22:31:47 ) But my internet application could not afford to drop connection like that.

Wed May 15 22:31:21 2019 [login to view URL] netifd: Network device 'eth4' link is down

Wed May 15 22:31:21 2019 [login to view URL] netifd: Interface 'wan' has link connectivity loss

Wed May 15 22:31:21 2019 [login to view URL] netifd: Interface 'wan6' has link connectivity loss

Wed May 15 22:31:21 2019 [login to view URL] kernel: [512410.155948] igb 0000:05:00.0 eth4: igb: eth4 NIC Link is Down

Wed May 15 22:31:24 2019 [login to view URL] dnsmasq[25267]: read /etc/hosts - 4 addresses

Wed May 15 22:31:24 2019 [login to view URL] dnsmasq[25267]: read /tmp/hosts/odhcpd - 3 addresses

Wed May 15 22:31:24 2019 [login to view URL] dnsmasq[25267]: read /tmp/hosts/[login to view URL] - 0 addresses

Wed May 15 22:31:32 2019 [login to view URL] odhcpd[4073]: DHCPV6 CONFIRM IA_NA from 00010001233ac8c23c970e5aa86a on br-lan: not on-link fd67:7559:7b13::7d3/128

Wed May 15 22:31:32 2019 [login to view URL] odhcpd[4073]: DHCPV6 SOLICIT IA_NA from 00010001233ac8c23c970e5aa86a on br-lan: ok fd67:7559:7b13::7d3/128

Wed May 15 22:31:32 2019 [login to view URL] dnsmasq[25267]: read /etc/hosts - 4 addresses

Wed May 15 22:31:32 2019 [login to view URL] dnsmasq[25267]: read /tmp/hosts/odhcpd - 2 addresses

Wed May 15 22:31:32 2019 [login to view URL] dnsmasq[25267]: read /tmp/hosts/[login to view URL] - 0 addresses

Wed May 15 22:31:33 2019 [login to view URL] odhcpd[4073]: DHCPV6 REQUEST IA_NA from 00010001233ac8c23c970e5aa86a on br-lan: ok fd67:7559:7b13::7d3/128

Wed May 15 22:31:33 2019 [login to view URL] dnsmasq[25267]: read /etc/hosts - 4 addresses

Wed May 15 22:31:33 2019 [login to view URL] dnsmasq[25267]: read /tmp/hosts/odhcpd - 3 addresses

Wed May 15 22:31:33 2019 [login to view URL] dnsmasq[25267]: read /tmp/hosts/[login to view URL] - 0 addresses

Wed May 15 22:31:47 2019 [login to view URL] netifd: Network device 'eth4' link is up

Wed May 15 22:31:47 2019 [login to view URL] netifd: Interface 'wan' has link connectivity

Wed May 15 22:31:47 2019 [login to view URL] netifd: Interface 'wan6' has link connectivity

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