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Thank you n2m for your help.
I have a fogginess regarding gateway load balancing with NTH feature:
Does ip proxy, works with nth load balancing?
Is it a good choice to use NTH with 2 different connections (one connection use shared bandwidth, unstable bandwidth)
Yes proxy works as normal, and by the way, i have been using NTH for these past 2-3 months, with one dedicated and one shared connection, and its working quite good .