Configuration Guide# DHCP Configuration: Router on a Stick (ROAS) Setup
Product: NGAFVersion: 8.0.471. Introduction1.1 ScenarioIn a small Enterprise Network, the network design is a Router-on-a-Stick (ROAS) setup in which the different VLANs can pass through a single connection. Configure the Sangfor NGAF as the DHCP Server and provide IPv4 addresses on all the endpoints on the network in a ROAS setup.
1.2 Other Details 1) The VLANs (Virtual LANs) are VLAN10 (172.16.10.0/ 24) and VLAN20 (172.16.20.0/ 24).2) The Core Switch port that is directly connected to the Sangfor NGAF is configured as a trunk port3) Desktops’ IPs are assigned dynamically.
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2. Configuration Guide2.1 NGAF ConfigurationStep 1. Choose the interface eth1 and create Subinterface for VLAN 10 and 20.Go to Network > Interfaces >Subinterfaces and click Add, as shown below:
Step 2. A new window will pop up when you click the Add Button. Then put the following details:Physical Interfaces: eth11) VLAN ID: 102) Description: Sub-interface for VLAN103) Static IP: 172.16.10.1/255.255.255.0Then click Save.
Step 3. Repeat Step 2 for VLAN 20.1) Physical Interfaces: eth12) VLAN ID: 203) Description: Sub-interface for VLAN104) Static IP: 172.16.20.1/255.255.255.0Then click Save. Step 4. Configure the subinterface (eth1.10) for DHCP.Go to Network > DHCP > DHCP Options and click Add, and put the following details as shown below:1) Service Type: DHCP Server2) Name: DHCP_Vlan103) Description: DHCP for Vlan104) Interface: eth1.105) IP Range: 172.16.10.100-172.16.10.2546) Netmask: 255.255.255.07) DHCP Gateway: 172.16.10.18) DNS Server: Specified9) Preferred DNS: 8.8.8.8Then click Save
Step 5. Configure the subinterface (eth1.20) for DHCPGo to Network > DHCP > DHCP Options and click Add, and put the following details as shown below:1) Service Type: DHCP Server2) Name: DHCP_Vlan203) Description: DHCP for Vlan204) Interface: eth1.205) IP Range: 172.16.20.100-172.16.20.2546) Netmask: 255.255.255.07) DHCP Gateway: 172.16.20.18) DNS Server: Specified9) Preferred DNS: 8.8.8.8Then click Save.
Step 6. Verify the 2 DHCP Poll added as shown below:
Step 7. Verify if the devices can get dynamic IP Addresses by issuing the ipconfig/all at the cmd. PC1 PC2
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3. Precaution1). Always verify the VLAN configuration if the endpoint can’t get the right IP Address.2). DHCP in ROAS is a real-world scenario but its single line makes it subject to failure. I suggest to have another line for redundancy.
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Hello, thanks for sharing. Can you share what will be the configuration of STATIC ROUTES, should I still add the IP Sub netmask ofVLAN 10 & VLAN 20? Thanks in advance.
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