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Hi,
I need a solution for the configuration
below:
Internet
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ISP
A ISP B
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Customer
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---------------------------- Web Server
Web Server will has 2 IP addresses, one will be
given by ISP A and the other one will be given by ISP B.
Primary DNS server is on ISP A and
secondary DNS server is on ISP B.
The DNS server on ISP A has two records for
customer's web server, for example :
www a 10.0.0.1 (IP address
given by ISP A)
www a 20.0.0.1 (IP
address given by ISP B)
The goal is to use dual ISP for back-up purpose, so
the web server will serve for 24 hour / day.
Since the DNS server only load balance between two
same host records, how about if one link is broken ?
For example :
Link from ISP B to Customer is
broken, meanwhile someone in Internet is accessing the web server and
the DNS server give him the IP address of 20.0.0.1, so the session
will time out. He will has an access to web server until the DNS
server give him the IP address of 10.0.0.1 (because the DNS server load
balance these two records).
Are there any solutions to solve this
problem, so the DNS server could detect the unreachable IP address
and after that it would give the correct reachable IP address to
the client ?
Thank you
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