VEGA VEGACOM 558 Ethernet - Manual (Page 38)

38 VEGACOM 558 Ethernet
Determine standard gateway for VEGACOM 558
From Rev. 1.10, VEGACOM 558 supports gateways or routers, whereby
these must be accessible within the subnet with regard to their IP ad-
dress.
This means:
If a gateway address is entered in VEGACOM 558 which does not fit the
network address and the subnet, VEGACOM 558 will deactivate the
gateway support.
Function:
If a gateway address unequal 0 is entered in VEGACOM 558, the gate-
way functionality will be activated. The above-mentioned boundary con-
dition, that the used address must be accessible within the subnet /
NetworkID, is a prerequisite.
Example:
If Host A (192.168.200.10) tries to reach a Host B in network
192.168.201, the protocol software in Host A determines by means of
the subnet entry that the destination host is in another network. If an IP
address is defined for a gateway, Host A will transmit an ARP enquiry to
the entered gateway to get its MAC address. Finally Host A transmits
the requested telegram to Host B, whereby the destination IP of the
destination computer (i.e. Host B) is entered, however, as destination
MAC, the destination IP of the gateway is used.
VEGACOM 558 as web server
By handing from one network to the other, the router replaces in the
received datagram the destination MAC address, either with the one of
the next router or with the one of the addressee (provided it can be
reached already directly).
On VEGACOM 558, the announcement of a router/gateway is carried
out exclusively by manual configuration.
Ethernet 192.168.200
Ethernet 192.168.201
192.168.200.10 192.168.201.4
192.168.200.2 192.168.201.6
192.168.200.1 192.168.201.1
Gateway / Router
A B