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Metric tells you computer's routing algorithms how efficient a particular
route is. Metrics can be many things (bandwidth, congestion, reliability,
etc.) and are sometimes monitored and scored dynamically by the hardware and
software routers. In the case of the Microsoft Control Panel IP
configuration, I think Metric is "hop count", ie. the relative number of
hops it takes to get to a particular destination over a given route. In
theory, you could set the metric to 1 for your preferred route and to 2 for
your backup route and when the machine figures out that route 1 is down, it
will automatically switch to route 2. However, Microsoft (not being known
for it's stellar networking) doesn't fail over like this in my experience.
It's never been enough of a problem for me to research it further though. I
use a CMD file to switch routes if one of my DSL lines goes down.
route add 0.0.0.0 mask 0.0.0.0 192.168.100.99 metric 1
route add 0.0.0.0 mask 0.0.0.0 192.168.100.98 metric 2
This command sets .99 as my primary gateway and .98 as the "backup", but
like I said, in practice I've never seen it actually fail over.
Kent
----- Original Message -----
From: "Bob Fulks" <bfulks@xxxxxxxxxxxx>
To: <realtraders@xxxxxxxxxxxxxxx>
Cc: "Lee Morris" <LMorris@xxxxxxxxxx>
Sent: Wednesday, January 30, 2002 11:01 AM
Subject: Re: [RT] two modems on network
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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