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Figure 5-4 WAN – Dynamic IP
This page displays the WAN IP parameters assigned dynamically by your ISP,
including IP address, Subnet Mask, Default Gateway, etc. Click the Renew button to
renew the IP parameters from your ISP. Click the Release button to release the IP
parameters.
MTU Size: The normal MTU (Maximum Transmission Unit) value for most Ethernet
networks is 1500 Bytes. For some ISPs you need to reduce the MTU. But this is
rarely required, and should not be done unless you are sure it is necessary for your
ISP connection.
If your ISP gives you one or two DNS addresses, select Use These DNS Servers
and enter the primary and secondary addresses into the correct fields. Otherwise,
the DNS servers will be assigned dynamically from ISP.
Note: If you get ‘Address not found' errors when you go to a Web site, it is likely
that your DNS servers are set up improperly. You should contact your ISP to get
DNS server addresses.
Get IP with Unicast DHCP: A few ISPs' DHCP servers do not support the
broadcast applications. If you cannot get the IP Address normally, you can choose
this option. (You generally need not check this option).
If you are also given a user name and a password for 802.1x authentication, you
should select 802.1x + Dynamic IP for WAN Connection Type, and a user name
and a password will then appear, shown in figure 5-4a:
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