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i am going to be setting our cisco 1841 router using ip sla to failover form one isp to another in the event the primary goes down. that part should be straight forward, the part that im having a hard time with is how to keep the webserver getting inbound connections. once the public ip switches hwo is the world going to know the web server is now at that address. i heard dynamic dns could accomplish this i am just not sure how. does anyone have a step by step guide? also how will my public dns record get changed? |
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Are you saying that your webserver is behind a dynamic IP address, one for each of the two ISPs? And you are using (or want to use) a DynDNS hostname (Dynamic DNS Free or Pro)? In case only one of the connections is active at any time, a normal update client would be recognizing the change of the IP address and would update your DynDNS hostname with it. Your router may have this DDNS update functionality built in, so you may use this. Refer to the manual. If you are using an own domain name and DNS hosting like Custom DNS, it would be quite similar. Either way, it can take some time (from minutes to hours) to propagate the change over the world throughout the DNS hierarchies, depending on several factors like TTL and caching. If you look for a real professional failover solution, check out the Dynect Platform. As you are asking for a step-by-step guide, is the DynDNS documentation not sufficient? What is missing? This wiki entry may be of further help. Yes, what I said exactly applies. You can go for it and start with "Dynamic DNS Free". Simply follow the step-by-step instructions.
Mar 31 at 04:02 PM
RotBlitz ♦
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Mar 31 at 04:03 PM
RotBlitz ♦
i'll check it out tonight, thank you
Mar 31 at 04:07 PM
cory
will the router be able to nat the traffic to the web server once the public ip changes?
Mar 31 at 05:20 PM
cory
NAT-ing the traffic is totally irrelevant to the change of the WAN IP address, as it is for inbound traffic already arrived at that changed IP address.
Mar 31 at 05:43 PM
RotBlitz ♦
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