C Ha Pte R 12 Dns; Overview; What You Can Do In This Chapter; What You Need To Know - ZyXEL Communications XMG3512-B10A User Manual

12.1 O ve rvie w
DNS
DNS (Domain Name System) is for mapping a domain name to its corresponding IP address and vice
versa. The DNS server is extremely important because without it, you must know the IP address of a
machine before you can access it.
In addition to the system DNS server(s), each WAN interface (service) is set to have its own static or
dynamic DNS server list. You can configure a DNS static route to forward DNS queries for certain domain
names through a specific WAN interface to its DNS server(s). The XMG uses a system DNS server (in the
order you specify in the
routing entry. After the XMG receives a DNS reply from a DNS server, it creates a new entry for the
resolved IP address in the routing table.
Dyna m ic DNS
Dynamic DNS allows you to update your current dynamic IP address with one or many dynamic DNS
services so that anyone can contact you (in NetMeeting, CU-SeeMe, etc.). You can also access your
FTP server or Web site on your own computer using a domain name (for instance myhost.dhs.org, where
myhost is a name of your choice) that will never change instead of using an IP address that changes
each time you reconnect. Your friends or relatives will always be able to call you even if they don't know
your IP address.
First of all, you need to have registered a dynamic DNS account with www.dyndns.org. This is for people
with a dynamic IP from their ISP or DHCP server that would still like to have a domain name. The Dynamic
DNS service provider will give you a password or key.
12.1.1 Wha t Yo u C a n Do in this C ha pte r
• Use the
DNS Entry
• Use the
Dyna m ic DNS
12.3 on page
12.1.2 Wha t Yo u Ne e d T o Kno w
DYNDNS Wildc a rd
Enabling the wildcard feature for your host causes *.yourhost.dyndns.org to be aliased to the same IP
address as yourhost.dyndns.org. This feature is useful if you want to be able to use, for example,
www.yourhost.dyndns.org and still reach your hostname.
screen) to resolve domain names that do not match any DNS
Bro a db a nd
screen to view, configure, or remove DNS routes
screen to enable DDNS and configure the DDNS settings on the XMG
167).
XMG3512-B10A User's Guide
C
HA PTER
165
1 2
DNS
(Section 12.2 on page 166).
(Section