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Cisco router dual isp load balancing12/29/2022 ![]() ![]() This results in download traffic coming through both the internet connections. The Internet is load shared based on sessions such that few sessions are sent through first internet connection and few sessions are sent through the other internet connections. These are SOHO Broadband routers which have multiple WAN ports which connect to multiple internet connections. The appliance can be as simple as a broadband router or as complex as a Link Proof which is meant for Data Centers and is meant for high availability. This technique uses an appliance to do load sharing. ![]() The closest way around it would be to use a concept of load sharing which shares your internet load across multiple internet connections session-wise but the load distribution will not be equal. So technically “the only way” to load balance your internet would be to take 2 internet connections from a single ISP in which case your unique ip address will be the same. When you load balance, the next packet will have a source address of your other internet connection towards the destination host but now the destination host will not recognize you since you are coming from a different ip address. Whenever you will initiate a request towards the internet, a session between you and the destination host is formed. Since you are having two internet connections, you are having 2 unique ip addresses. The problem here lies with your ip address. This should cause the return traffic to be load balanced between your 2 internet connections. This can happen if half of the requests are sent through one link and the rest half through the other. When you think of load balancing, the thought comes to your mind that both your internet link will be equally used to give redundancy and increased throughput. Your ip address is the unique distinguishing factor which is the reason why the request you sent is served back to you and not to anybody else. ![]() This unique ip address is provided by your ISP. ![]() The main problem with load balancing Internet connections is that every internet comes with its own ip address. This is a topic much discussed in forums but leading to no solutions. ![]()
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