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We are using 2 broadband connection and we want to combine internet speed of both connection into 1. suppose Broadband connection 1 provide 10Mbps and Broadband connection 2 provide 10Mbps now I want to combine both connections' speed into one. so, output speed with be 20Mbps.

Can you please tell us how to achieve this? Does firewall provide such feature? if you have any idea about any device please let me know. thanks,

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    You would only be able to get 20 Mbps if you are using two sessions. For instance if you download 1 file, that would get 10 Mbps. Then if you start another download that would get an additional 10 Mbps. You would never be able to download 1 file using 20 Mbps.
    – user36472
    Jan 23 '18 at 8:47
  • @Crown Thank you! How is it possible? and if I do a speed test will it show 20Mbps?
    – MageDev
    Jan 23 '18 at 10:13
  • @Crown, if there are multiple users then how it will work?
    – MageDev
    Jan 23 '18 at 10:16
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    If you would do a speedtest it would only show 10 Mbps. There are many ways to do this (typically with a router), but we would need to know more about what type of network equipment you have and a network diagram or drawing to know more about how your network is designed.
    – user36472
    Jan 23 '18 at 10:34
  • @Cown we are using DSL and ADSL routers using wifi we are connecting all 18 laptops. we have 2 different ISP. there are 3 connections with one 1 ISP and 1 connection with another ISP. total we have 4 broadband connection each connection have a separate router. Now, I want to combine two or more connection and output speed will be the sum of connection and all the user will use from that output. it might be wifi or if need LAN cable then also not an issue.
    – MageDev
    Jan 23 '18 at 10:57
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You can achieve this using 2 methods, either load-balancing and bonding.

Load-balancing splits traffic between 2 paths using some configured algorithms (round-robin, hash-based, ...). The maximum speed for a connection is drawn by the bandwidth of the interface is forwarded/routed through.

Bonding treats 2 path as an aggregate. If I remember well, the maximum bandwidth is equal to the sum of the interfaces's rate. However, as far as I know, configuring bonding for links require that bonding is also configured at the other end of link. I don't think that you are able to bond link ISP links. EDIT Thanks to Ron's comment, you can't bond multiple ISP links.

To achieve load-balancing, you can use software routers such as pfsense (or do it by yourself by configuring a linux server for example).

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    You cannot bond two connection to two different ISPs, and round-robin really doesn't work with two different public addresses from behind NAT. Really, only flow-based load balancing will work.
    – Ron Maupin
    Jan 23 '18 at 15:21
  • I appreciate the clarification on the inability to bond multiple ISP links.
    – vera
    Jan 23 '18 at 15:23

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