Cisco QuickVPN - PC Administration Manual page 64

Networking
Configuring the Optional WAN
STEP 6
STEP 7
Cisco SA 500 Series Security Appliances Administration Guide
• DNS Server Source: DNS servers map Internet domain names (example:
www.cisco.com) to IP addresses. You can get DNS server addresses
automatically from your ISP or use ISP-specified addresses.
- Get Dynamically from ISP: Choose this option if you have not been
assigned a static DNS IP address.
- Use These DNS Servers.: Choose this option if your ISP assigned a
static DNS IP address. Also enter the addresses for the Primary DNS
Server and the Secondary DNS Server.
If required by your ISP, configure the following settings in the MTU Size area:
• MTU Type: The Maximum Transmission Unit is the size, in bytes, of the
largest packet that can be passed on. Choose Default to use the default
MTU size, 1500 bytes. Choose Custom if you want to specify another size.
• MTU Size: If you chose Customer for the MTU Type, enter the custom MTU
size in bytes.
The MTU (Maximum Transmit Unit) is the size of the largest packet that can
NOTE
be sent over the network. The standard MTU value for Ethernet networks is
usually 1500 Bytes. For PPPoE connections, it is 1492 Bytes. Unless a
change is required by your ISP, it is recommended that the MTU values be
left as is.
If a MAC address source is required by your ISP, enter the following information in
the Router's MAC Address area:
• MAC Address Source: Typically, you use the unique 48-bit local Ethernet
address of the security appliance as your MAC address source. If your ISP
requires MAC authentication and another MAC address has been previously
registered with your ISP, you can enter a different MAC address to use for
this purpose.
- Use Default Address: Choose this option to use the default MAC
address.
- Use this computer's MAC address: Choose this option if you want to
use the MAC address of your computer as the MAC address source.
- Use This MAC Address: Choose this option if you want to enter a MAC
address that your ISP requires for this connection (sometimes called
MAC address cloning). Enter the MAC Address in the format
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