Billion Electric Company BiPAC 8501/8521 - Manual (Page 49)

Billion BiPAC 8500/8501/8520/8521 SHDSL (VPN) Firewall Bridge/ Router
Chapter 4: Configuration
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If you check DHCP Relay Agent and click Next, then you will have to enter the IP address of
the DHCP server which will assign an IP address back to the DHCP client in the LAN. Use this
function only if advised to do so by your network administrator or ISP.
Click Apply to enable this function.