Multiple links on only one gateway - howto?

I have multiple links to ISP on primary machine with ip addresses x.x.x.1/24, x.x.x.2/24, x.x.x.3/24,… (all of them on same subnet), and only one gateway on same subnet for all of those interfaces (ex. x.x.x.254). I have tried to make multiple eoip tunnels to second machine, and on the primary i make NAT 1:1. Then with policy routing on second machine I am relaying some of transport to those eopi tunnels. Download is working great. Everyone is downloading form the desired tunnel and interface, but there is a big problem with upload. Everything is going through desired eoip’s but only through one interface on primary machine!!! How to overcome this problem… Thanx…

Anyone :question: