I want to connect a Cisco-router (18xx?) to my LAN and to 2 different ISP:s. I want a feature that checks the availability of the ISP-connections and does some kind of failover if the primary ISP is malfunctional.
Are there many ways to do this? I have heard about a feature that with a script checks that there is a respons to/from something a few hops into the ISP clouds and if not it fails over to the secondary ISP.
You should look into implementing BGP between the 2 carriers. Even if you were able to push traffic from your inside network to the internet, aren't you concerned about your devices holding public IP such as your email/smtp server and web/ftp server ?
Those public IPs would only be advertised via one ISP, not the other during failover.
With BGP, the ISPs would allow you to failover using your same external IPs.
Most likely, you will need a Class C /24 block and own your BGP-AS.
in addition to Edison's post, just be aware that getting your own public BGP AS is not an easy thing to do. You will need a good reason, and provide solid reasoning to IANA or RIPE (these are the organizations that maintain the BGP AS numbers) in order to obtain one. If you are a small company, and not an ISP, there is a good chance that you will not get it...
But there are other ways to make your connection redundant, such as 'Reliable Static Routing Backup Using Object Tracking' or tunnel keepalives (see the links below), but these features require certain IOS levels. Which IOS version are you running ?
Reliable Static Routing Backup Using Object Tracking
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.