VEGA VEGACOM 558 Ethernet - Manual (Page 37)

VEGACOM 558 Ethernet 37
DNS by means of VEGACOM 558
If an application on a host (with VEGACOM 558 e.g. the Mail Client or
PING in TELNET window) tries to call another network participant with its
host name, the enquiring computer first has to know the IP address of
the destination computer.
The following steps are carried out:
Step 1:
The enquiring computer (VEGACOM 558) first asks via an ARP enquiry
for the MAC address of the entered DomainNameServers in the net-
work. If available, the MAC address is returned.
Step 2:
The enquiring computer (VEGACOM 558) transmits a DNS telegram to
the DomainNameServer asking "which IP belongs to the host name xyz".
If the name server can resolve the host name, it will return the requested
IP directly as answer (probably the enquiry will be transferred to an-
other name server).
Step 3:
The enquiring computer (VEGACOM 558) can now transmit the tel-
egrams directly to the destination computer, the IP of which is known
now.
Note!!!
Conversion of the DNS configuration is currently only effective after a
restart of VEGACOM 558.
VEGACOM 558 as web server