Firewall rules examples

Refer to these examples when creating firewall rules.

Create a rule to allow DHCP outgoing on UDP local port 68 to remote port 67

To create a firewall rule that allows you to get an IP address on an interface, we recommend creating two rules. First create a rule to allow DHCP outgoing on UDP local port 68 and remote port 67, then create a rule to allow DNS queries.

Rule Name — Type a name for the rule
Status — Enabled
Action — Allow
Direction — Outgoing
Network Protocol — Not applicable
Transport Protocol — Select Protocol
Select UDP, Local, then type the Port No as 68
Select UDP, Remote, then type the Port No as 67

Create a rule to allow DNS queries

Rule Name — Type a name for the rule
Status — Enabled
Action — Allow
Direction — Outgoing
Network Protocol — Not applicable
Transport Protocol — Select Protocol
Select UDP, Remote, then type the Port No as 53

Create a rule to allow access to websites

Rule Name — Type a name for the rule
Status — Enabled
Action — Allow
Direction — Outgoing
Network Protocol — Not applicable.
Transport Protocol — Select Protocol
Select TCP, Remote, then type the Port No as 80

Allow specific remote IP address and port access

Rule Name — Type a name for the rule
Status — Enabled
Action — Allow
Direction — Outgoing
In Network Protocol, select Remote | Subnet, then type the Subnet Mask value
Transport Protocol — Select Protocol
Select TCP, Remote, then type the Port No

Tip
You can type a single port number, or series of port numbers using a comma, or a range of ports using a hyphen.

Recommended firewall rules

In addition to the default firewall rules, we recommend that you configure these rules:

Allow bi-directional NTP port 123 to 123
Allow bi-directional NetBIOS name service port 137 to 137
Allow outgoing FTP client port 1024-65535 to 21
Allow outgoing for POP3, IMAP, SMTP
Allow outgoing for RDP
Allow outgoing for Idap
Allow bi-directional for AFP/SMB, if you are using file sharing