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Gateway of Last resort

Posted on 2007-11-23
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Last Modified: 2012-08-14
I am trying a basic set-up that I want to look like this:

Internet
 |
ISP router (cisco 870)
 |
ASA 5510
 |
LAN

My ISP has given me a /29 network of public IP addresses, the first address is assigned to the ISP's router. I have assigned the second in the range to the Outside interface of my ASA. I am planning to use the rest of the IPs in a DMZ and for some NATting. The problem is that when I try to specify the default route to be the IP of the ISP's router, I get warned that the route is directly connected, which it is.
But how do I specify my gateway of last resort to use the ISP router?
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Question by:Curlysafrican
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Expert Comment

by:mediaonegraphics
ID: 20338228
Question. Why dont you have the ISP's router setup as a bridge and your ASA as the 1st public?
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Author Comment

by:Curlysafrican
ID: 20338280
My ISP doesn't do bridging on the routers. Part of their policy/strategy.
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Expert Comment

by:mediaonegraphics
ID: 20338307
The ISP's router should be configured as your default gateway:
http://www.cisco.com/warp/public/105/default.html
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Author Comment

by:Curlysafrican
ID: 20338361
I have tried to specify the ISP's router as my default gateway with no joy. Thanks for the link, but the ASA's CLI works a little different to that of the routers mentioned.

I entered the following:
ASA(config)# route Outside 0.0.0.0 0.0.0.0 <IP address of router> 1

Then I get the following output:
ERROR: Cannot add route, connected route exists.

Even when I try to add the router's external IP, I get this message.
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Expert Comment

by:mediaonegraphics
ID: 20338376
Try using the gateway IP as used in the ISP's router.
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Author Comment

by:Curlysafrican
ID: 20338438
I get the same result.
ERROR: Cannot add route, connected route exists.
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Expert Comment

by:batry_boy
ID: 20338697
Post the current ASA configuration...is it using DHCP for Ethernet0 with the "setroute" option at the end?  If so, the ASA is picking up the default route from the ISP's router.
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Accepted Solution

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Curlysafrican earned 0 total points
ID: 20367232
Restarting the device allowed the next hop to be entered.
I noticed a default route "speciified" on the management interface when issuing a show route.
After the restart I was able to apply the conifg:

ASA(config)# route Outside 0.0.0.0 0.0.0.0 <IP address of router> 1
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Expert Comment

by:batry_boy
ID: 20367386
Cool...did that fix your issue?
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Author Comment

by:Curlysafrican
ID: 20367494
It did resolve the issue that I had and now I can talk out without problem. Thanks for all your input.

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