ESR series service routers.ESR-Series. User manual
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DHCP server DHCP server enables automation and centralization of the network
device configuration process.
DHCP server allocated on a router allows for a complete solution for the
local area network support.
DHCP server integrated into the router assigns IP addresses to network
devices and transfers additional network settings, e.g. server addresses,
network gateway addresses and other necessary settings.
DHCP Relay The DHCP Relay functionality is designed to redirect broadcast DHCP
Discover packets from one broadcast domain to unicast DHCP Discover
packets in another broadcast domain.
NAT, Network Address Translation Network address translation is a mechanism that translates IP
addresses and port numbers for transit packets.
NAT function allows to minimize the quantity of IP address used through
translation of multiple internal network IP addresses into a single
external public IP address. NAT conceals local area network internal
structure and allows to enhance its security.
Routers support the following NAT options:
Source NAT (SNAT) – the network address and the source port
number will be replaced, when packet is transferred forth, and the
destination address will be replaced in the response packet;
Destination NAT (DNAT) – external access is translated by the
router to the user computer in LAN that has an internal address
and thus directly inaccessible from outside the network (without
NAT).
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