[TriLUG] Off Topic: Need Cisco Router Config Help
tarus at opennms.org
Thu Apr 3 20:53:10 EDT 2008
On Apr 3, 2008, at 7:32 PM, Chris Bullock wrote:
> First thing I would do is without the help of the host file try to
> private.opennms.com and see what you get. Then perform a dig or
> to see exactly what DNS server gave you that IP.
It's definitely not a DNS issue. It's a NAT issue.
Let's assume the external address is 10.1.1.1 and the internal LAN is
If www.example.com points to 10.1.1.1, the router will NAT port 80 to
From outside the LAN, http://www.example.com works fine.
From inside the LAN, http://www.example.com connects to the router's
HTTP server (http://10.1.1.1), thus NAT is not working from the LAN.
The *workaround* is to set, on the LAN, www.example.com to point to
Now, when the router was a Linksys, www.example.com worked in all
places. I was wondering if there was something in the way Cisco does
NAT to make that work as well.
Tarus Balog, OpenNMS Maintainer Main: +1 919 533 0160
The OpenNMS Group, Inc. Fax: +1 503 961 7746
Email: tarus at opennms.org URL: http://www.opennms.org
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