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At 8:15 PM -0500 1/29/02, Lee Morris wrote:
>I have been considering adding a backup ISP to my LAN. I now have
>cable service and am considering adding a DSL line. Does anyone know
>if they both can be fed into a router or hub in such a way that if
>one is down it will route traffic automatically to the other. Seems
>like this would be a common issue but I have never seen anything on
>it or must I manually switch ISP's.
I have that configuration exactly.
Both the cable modem and DSL modem feed individual Lynksys SR11
routers that connect to a NetGear 10/100 Ethernet switch to which all
systems are connected. I use fixed local IP addresses in the
192.168.xxx.xxx series on every system. One Linksys router has local
IP address 192.168.1.1 and one has local IP address 192.168.1.2.
In the TCP/IP control panel of every system you put both 192.168.1.1
and 192.168.1.2 for the default gateway and the DNS server addresses.
Put the preferred one first. I make the preferred one different on
different machines to share the load if both ISP's are working.
Windows 2000 has the ability to include a "Metric" for each provider
which probably has something to do with the priority of each but I
haven't figured out what it is yet. Perhaps someone on the list knows.
Each system will try one gateway and if that doesn't work, will try
the other one. Works great since it is extremely unlikely that both
will be down at the same time.
Bob Fulks
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