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Model FVS328 ProSafe VPN Firewall with Dial Back-up Reference Manual
Responding to Ping on Internet WAN Port
If you want the firewall to respond to a 'ping' from the Internet, click the 'Respond to Ping on
Internet WAN Port' check box. This should only be used as a diagnostic tool, since it allows your
firewall to be discovered. Don't check this box unless you have a specific reason to do so.
How to Set the MTU Size
The normal MTU (Maximum Transmit Unit) value for most Ethernet networks is 1500 bytes or
1492 Bytes for PPPoE connections. For some ISPs you may 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.
Any packets sent through the firewall that are larger than the configured MTU size will be
repackaged into smaller packets to meet the MTU requirement.
To change the MTU size:
Under MTU Size, select Custom.
1.
Enter a new size between 64 and 1500.
2.
Click Apply to save the new configuration.
3.
Configuring Dynamic DNS
If your network has a permanently assigned IP address, you can register a domain name and have
that name linked with your IP address by public Domain Name Servers (DNS). However, if your
Internet account uses a dynamically assigned IP address, you will not know in advance what your
IP address will be, and the address can change frequently. In this case, you can use a commercial
dynamic DNS service, which will allow you to register your domain to their IP address, and will
forward traffic directed to your domain to your frequently-changing IP address.
The firewall contains a client that can connect to a dynamic DNS service provider. To use this
feature, you must select a service provider and obtain an account with them. After you have
configured your account information in the firewall, whenever your ISP-assigned IP address
changes, your firewall will automatically contact your dynamic DNS service provider, log in to
your account, and register your new IP address.
5-6
May 2004, 202-10031-01
WAN and LAN Configuration
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Troubleshooting
