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How to set an alternate Default Gateway

Posted on 2012-03-12
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Last Modified: 2012-03-12
One of our clients has 2 sites linked via leased line. Each site also has a router and gateway.

How can i set it so that if one gateway fails to try the other?

both gateways are on the same IP range.

eg.
site 1 router 192.168.60.5
site 2 router 192.168.60.6
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Question by:Neal58
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Dhiraj Mutha earned 200 total points
ID: 37709314
Hope the attached screenshot helps.
Gateways.png
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by:warddhooghe
warddhooghe earned 100 total points
ID: 37709330
lowest metric will be used first, dont use the same for both
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by:Neal58
ID: 37709344
can i set any amount as the metric? so set site 1 as metric of 1, and site 2 as metric of 2 to have preferred site 1?

if this is the case then will probably do it in multiples of 10 or 100.
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by:Dhiraj Mutha
ID: 37709348
No, metric is used to define which gateway will have priority.
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by:Neal58
ID: 37709352
so the lower the metric the higher the priority? or are there defined amounts to use?
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by:Ernie Beek
Ernie Beek earned 200 total points
ID: 37709371
Make sure that the secondary DG has a higher metric than the primary DG (for example, primary=1 and secondary =2).
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by:Ernie Beek
ID: 37709380
Hm, should have refreshed the page before commenting........

But indeed, the lower the metric the higher the priority. You can see the metric as an administrative distance.
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by:Neal58
ID: 37709945
one last check, this will over-ride any setting set on the previous IP settings page? so for example .5 is set as the static default gateway, but this will be over-ridden by the higher cost option if it needs to be?

also would the router need to be physically disconnected for the higher cost gateway to take effect?
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by:Ernie Beek
ID: 37709983
It shouldn't over ride/write it, just add. If I remember correct, the address must be unreachable. So if the internet connection is gone but the router (and the internal ip) is still up you must disconnect it or shutdown the interface.
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by:Neal58
ID: 37709990
OK, I had assumed as much. I guess it's too much to ask that there is a way for it to check that the gateway connection is active!
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by:Ernie Beek
ID: 37710008
You might want to look at a hardware solution otherwise, like: http://www.cisco.com/en/US/products/ps9925/index.html
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