Symantec Security 5600 Series, Security 5400 Series,Clientless VPN 4400 Series, Administration Manual

Page: 151 / 861

151 Establishing your network
About the security gateway’s implementation of DNS
6
Optionally, do one of the following:
■
To save your configuration now and activate later, on the toolbar, click Save .
■
To activate your configuration now, on the toolbar, click Activate .
When prompted to save your changes, click Yes .
Related information
For further information related to this topic, see the following:
■
“DNS Root Server Record Properties—General tab” on page 681
Delegating naming authority with a DNS subnet record
You can use DNS subnets to delegate naming authority for a range of addresses, including Classless
Inter-Domain Routing (CIDR) addresses. Subnet records are also sometimes referred to as subnet
maps.
Subnet records are only required if you do not own the entire Class C IP address scheme. When you
configure it you must also configure an authority record.
Note: Your security gateway responds to reverse lookup requests only when your ISP has delegated the
reverse domain and you have configured your security gateway as the reverse domain authority for the
subnet.
Prerequisites
Complete the following task before beginning this procedure:
■
“Defining an authoritative server with a DNS authority record” on page 145
To delegate naming authority with a DNS subnet record
1 In the SGMI, in the left pane, under Assets, click Network .
2 In the right pane, on the DNS tab, click New > DNS Subnet Record .
3 In the DNS Subnet Record Properties dialog box, on the General tab, do the following:
4
On the Domains Served tab, to configure the domain for which the name server will provide
service, do the following:
■
In the Domain text box, type the domain name.
■
Click Add .
5 Optionally, on the Description tab, type a more detailed description than what you typed in the
Caption text box.
6 Click OK .
7 Optionally, do one of the following:
■
To save your configuration now and activate later, on the toolbar, click Save .
■
To activate your configuration now, on the toolbar, click Activate .
Enable To enable the DNS subnet record, click Enable .
Accessibility Select Private or Public.
IP address Type the IP address of the DNS subnet.
Netmask Type the subnet mask.
Caption Type a brief description of the DNS subnet.