Internet access through a static IP address configuration examples

·     Introduction

·     Prerequisites

·     Example: Configuring Internet access through a static IP address

 

The following information provides the configuration examples of using a static IP address to access the Internet.

 

This document is not restricted to specific software or hardware versions. Procedures and information in the examples might be slightly different depending on the software or hardware version of the device.

The configuration examples were created and verified in a lab environment, and all the devices were started with the factory default configuration. When you are working on a live network, make sure you understand the potential impact of every command on your network.

The following information is provided based on the assumption that you have basic knowledge of IP features.

Network configuration

As shown in Figure 1, a device is deployed as the egress device that connects the internal network to the ISP. Perform the following tasks to allow the internal users to access the Internet:

·     Configure the DHCP server on the device to assign private IP addresses and the DNS server address to the hosts.

·     Allow the internal users to access the Web server on the Internet. The website of the Web server is www.example.com.

Figure 1 Network diagram

 

 

Software versions used

This configuration example was created and verified on E8371 of the F5000-AI160 device.

Restrictions and guidelines

When you configure the DHCP server on the device, perform the following tasks:

·     Allow traffic from security zones Trust (to which the DHCP server belongs) to Local to ensure that the DHCP clients can obtain IP addresses.

·     Enable DNS service on the device to convey DNS requests between the DNS server and the DNS clients.

Procedure

Configuring the device

1.     Configure a static IP address.

# On the top navigation bar, click System.

# From the navigation pane, select Configuration Wizard > Internet Access.

Figure 2 Internet access configuration page

 

# Select the routing mode and click Configure.

# Configure the WAN interface as shown in Figure 3.

Figure 3 WAN interface configuration

 

# Click Next.

# Configure the LAN interface as shown in Figure 4.

Figure 4 LAN interface configuration

 

# Click Next. Skip the security cloud configuration.

# Click Next. The following page opens.

Figure 5 Verifying the configuration

 

# Verify the configuration and click Finish.

2.     Configure a security policy.

# After you configure the Internet access through a static IP address, the system automatically creates a security policy named GuideSecPolicy.

# To view the security policy:

a.     On the top navigation bar, click Policies.

b.     From the navigation pane, select Security Policies > Security Policies.

Figure 6 Security policy configuration page

 

 

# Click the Edit icon for this security policy.

# In the dialog box that opens, add security zone Local to the source zones, and add security zones Trust and Local to the destination zones.

Figure 7 Editing the security policy

 

3.     Configure DHCP.

# On the top navigation bar, click Network.

# From the navigation pane, select DHCP > DHCP Address Pools.

# Click the Address Pool Options tab, and configure the settings as shown in Figure 8.

Figure 8 Address pool option configuration

 

4.     Configure DNS service.

# On the top navigation bar, click Network.

# From the navigation pane, select DNS > Advanced Settings.

# Enable the DNS service.

Figure 9 DNS service configuration page

 

 

Configuring the host

# Configure the host to obtain an IP address through DHCP.

Verifying the configuration

1.     Display the IP address that the host obtains.

C:\>ipconfig /all

Ethernet adapter Ethernet 1:

   Connection-specific DNS SUffix.:

   Description....................: Intel(R) 82579LM Gigabit Network Connection

   Physical Address...............: E8-39-35-5C-92-B8

   DHCP Enabled ..................: Yes

   Autoconfiguration Enabled......: Yes

   Link-local IPv6 Address........: fe80::b8dd:d091:201a:6db2%13(Preferred)

   IPv4 Address...................: 172.16.1.3(Preferred)

   Subnet Mask....................: 255.255.255.0

   Lease Obtained.................: Monday, October 8, 2018 2:44:36 AM

   Lease Expires..................: Tuesday, October 9, 2018 2:44:36 AM

   Default Gateway................: 172.16.1.254

   DHCP Server....................: 172.16.1.254

   DHCPv6 IAID....................: 384317749

   DHCPv6 Client DUID.............: 00-01-00-01-1F-B4-A3-F5-B8-A3-86-6F-0F-02

   DNS Server.....................: 219.141.136.102

   NetBIOS over Tcpip.............: Enabled

2.     Verify that you can ping a domain name on the public network from the host.

C:\>ping www.example.com

 

Pinging www.example.com [192.168.100.201] with 32 bytes of data:

Reply from 192.168.100.201: bytes=32 time<1ms TTL=253

Reply from 192.168.100.201: bytes=32 time<1ms TTL=253

Reply from 192.168.100.201: bytes=32 time<1ms TTL=253

Reply from 192.168.100.201: bytes=32 time<1ms TTL=253

 

Ping statistics for 192.168.100.201:

    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss)

Approximate round trip times in milli-seconds:

Minimum = 0ms, Maximum = 0ms, Average = 0ms