HI

I have Vigor2920 and would like to know how i can distribute to 2 wan connetions to my clients computers,
for example ip addess from 192.168.1.1 to 192.168.1.50 use WAN1 and 192.168.1.51 to 192.168.1.100 use WAN2 connection

Than you very much

On the Draytek 2820 (and I assume the 2920 is pretty similar) its under WAN -> Load-Balance Policy.

Your rule 1 would be:
Any Traffic - WAN1 - from IP 192.168.1.1 to 192.168.1.50

Your rule 2 would be:
Any Traffic - WAN2 - from IP 192.168.1.51 to 192.168.1.100

Enabling failover allows the rule to use the other WAN connection if its WAN connection goes down.