Now we assigned a static Public IP address of 150.150.150.2 from Primary ISP and another static Public IP address of 160.160.160.2 from our Backup ISP. The below configuration will works for ASA 5505 version 7.2(1) and above.
from our internal network towards the Internet). Please note that the above scenario is valid only for outbound traffic (i.e. If the primary link fails, the secondary DSL connection should be utilized for Internet access. Normally all of our traffic should flow through the high speed primary ISP. Suppose we have a primary high-speed ISP connection, and a cheaper DSL line connected to a Secondary ISP.
This is article that explains how to configure dual ISPs on a Cisco ASA 5505 firewall for redundancy purpose.
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