Configuring NG Firewall for AWS using routed subnets: Difference between revisions

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=<span style="color: #000000; font-weight: 400; text-decoration: none;">Introduction</span>=
== Overview ==
<span style="color: #000000; font-weight: 400; text-decoration: none;">The following instructions will guide you through the process of using the Amazon Web Services console (UI) to install Untangle into a Virtual Private (VPC) Cloud at AWS.    </span>
[[File:Aws_schemas_advanced.png|thumb|right|upright=1.4|alt=Untangle NG Firewall in relation to AWS instances and VPN tunnels.|Untangle NG Firewall in relation to AWS instances and VPN tunnels.]]Untangle NG Firewall deployment in AWS can secure Internet access for other AWS instances. This scenario is useful if you have for example [https://aws.amazon.com/workspaces Amazon Workspaces] and you need to apply Intrusion Prevention, Content Filtering, Bandwidth Control, and other next generation firewall capabilities to those instances. This type of deployment requires advanced Virtual Private Cloud (VPC) configuration to establish an internal subnet for AWS instances that routes through NG Firewall.


<span style="color: #000000; font-weight: 400; text-decoration: none;">This document assumes you have an AWS account with a VPC created.  If not, you will need to create a VPC prior to using this document.</span>
== Before you begin ==
*Follow the steps outlined in [https://wiki.untangle.com/index.php/Deploying_NG_Firewall_in_AWS Deploying NG Firewall in AWS].
*Review [https://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Subnets.html VPCs and Subnets] in the AWS documentation.


== Step 1. Configure a Security Group ==
AWS instances and network interfaces inherit traffic rules defined by [https://docs.aws.amazon.com/vpc/latest/userguide/VPC_SecurityGroups.html security groups]. The security group assigned to your NG Firewall instance and instances on the private network behind NG Firewall should have an open policy to avoid conflicts. Confirm that the security group designated for your instances has rules to permit all incoming and outgoing traffic.


==<span style="color: #000000; font-weight: 400; text-decoration: none;">VPC</span>==
#In the [https://aws.amazon.com/console AWS Management Console] go to your VPC configuration from the '''Services''' menu.
<span style="color: #000000; font-weight: 400; text-decoration: none;">To use this document, you will need to have a VPC with 2 subnets.   This document will describe the steps to create the subnets.  </span><span style="color: #000000; font-weight: 400; text-decoration: none;">If you need to create a VPC, we recommend:</span>
#Click '''Security Groups'''.
#Select the default security group or a custom security group you designate for instances belonging to your internal subnet.
#In the Inbound Rules tab, click '''Edit'''.[[File:Aws-securitygroups-inbound.png|none|thumb|upright=1.2|Security group with permissive inbound rule]]
#Add or confirm a rule allowing all traffic for all protocols where the source is 0.0.0.0/0.
#Confirm this same policy in the Outbound Rules tab.


# <span style="color: #000000; font-weight: 400; text-decoration: none;">Amazon Virtual Private Cloud Getting Started Guide:  http://docs.aws.amazon.com/AmazonVPC/latest/GettingStartedGuide/vpc-gsg.pdf</span>
== Step 2. Configure a Network ACL ==
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Amazon Virtual Private Cloud User Guide:  http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/vpc-ug.pdf</span>
[[File:Aws-networkacls-inbound.png|thumb|upright=1.5|Network ACL with permissive inbound rule]]Each subnet inherits the policies of [https://docs.aws.amazon.com/vpc/latest/userguide/vpc-network-acls.html network ACLs]. Confirm that the network ACL designated for your internal subnet contain rules to permit all incoming and outgoing traffic.


#In the [https://aws.amazon.com/console AWS Management Console] go to your VPC configuration from the '''Services''' menu.
#Click '''Network ACLs'''.
#Select the default network ACL or a custom network ACL if designated for your internal subnet.
#In the Inbound Rules tab, click '''Edit'''.
#Add or confirm a rule allowing all traffic for all protocols where the source is 0.0.0.0/0.
#Confirm this same policy in the '''Outbound Rules''' tab.


==<span style="color: #000000; font-weight: 400; text-decoration: none;">Security group</span>==
== Step 3. Create an internal subnet ==
<span style="color: #000000; font-weight: 400; text-decoration: none;">Create one that authorizes all traffic: NGFW is by default locked down to only allow HTTPS and SSH when it is initialized.   Services → VPCs → Security → Security Groups</span>
[[File:Aws-subnet-wiz.png|thumb|upright=1.2|AWS subnet configuration wizard]]To route traffic for AWS instances through NG Firewall you must designate an internal [[https://docs.aws.amazon.com/vpc/latest/userguide/working-with-vpcs.html#AddaSubnet subnet]]. You assign this subnet to network interfaces belonging to your AWS instances and NG Firewall.


# <span style="color: #000000; font-weight: 400; text-decoration: none;">If you wish, you can later restrict more ports in that security group, after you're done configuring NGFW.</span>
#In the [[https://aws.amazon.com/console AWS Management Console]] go to your VPC configuration from the '''Services''' menu.
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Make sure to authorize traffic from your local machine/network for access.</span>
#Click '''Subnets'''.
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Create and select the “Save” button</span>
#Click '''Create Subnet'''.
#Select the VPC containing your NG Firewall and AWS instances.
#Select the same availability zone as your NG Firewall instance.
#Assign an IPv4 block that is within the scope of your VPC.
#Click '''Create''' to confirm the new subnet.


== Step 4. Create a network interface ==
[https://docs.aws.amazon.com/vpc/latest/userguide/VPC_ElasticNetworkInterfaces.html Network interfaces in AWS] attach to instances and facilitate network access to the VPC. The NG Firewall and instances protected by the firewall must be assigned to the internal subnet you created in the previous step. If you created your instances and network interfaces prior to creating the internal subnet, you can create new network interfaces to associate your instances to the internal subnet.


== <span style="color: #000000; font-weight: 400; text-decoration: none;">Subnets</span>==
#In the [https://aws.amazon.com/console AWS Management Console] go to your EC2 configuration from the '''Services''' menu.
<span style="color: #000000; font-weight: 400; text-decoration: none;">Create 2 subnets, one for the external NGFW interface and the other for the internal one.    Make sure the subnets are in the same VPC and within the same availability zone. Navigate to Services →  VPCs → Subnets. In this example, the VPC Network we are using is: 172.31.0.0/16</span>
#Click '''Network Interfaces'''.
#Click '''Create Network Interface'''.[[File:Aws-create-interface.png|thumb|none|upright=1.6|AWS network interface configuration wizard]]
#Select the internal subnet you created in the previous step.
#Keep '''Private IP''' as ''auto assign''.
#Select the permissive security group you created in the first step.
#Click '''Yes, Create'''.
== Step 5. Attach the network interface ==
[[File:Aws_attach_iface.png|thumb|right|upright=1.3|Attaching a network interface to an instance in AWS]]After you create a network interface you must attach it to an instance.  


#In the Network Interfaces screen select an available interface that belongs to the internal subnet.
#In the '''Actions''' menu choose '''Attach'''.
#Select the Instance ID of your NG Firewall
#Repeat the steps for creating and attaching network interfaces for all instances that you intend to place on the internal subnet.
{{Note|text=If you attach a new network interface to an instance other than NG Firewall, it is recommended to detach the previous network interface to prevent traffic from bypassing NG Firewall. To detach an interface, select the network interface and choose '''Detach''' from the '''Actions''' menu. }}
== Step 6. Disable source and destination check ==
[[File:Aws-src-check.png|thumb|right|upright=.8|Disabling source and destination check on a network interface in AWS]]By default, the AWS VPC configuration prevents NAT routing. You must override this behavior by [https://docs.aws.amazon.com/vpc/latest/userguide/VPC_NAT_Instance.html#EIP_Disable_SrcDestCheck disabling source and destination check] for the internal network interface of NG Firewall.


<span style="color: #000000; font-weight: 400; text-decoration: none;">Create the External Subnet:</span>
#In the network interfaces screen select the internal network interface attached to NG Firewall.
#In the '''Actions''' menu choose '''Change Source/Dest. Check'''.
#Set the value to '''Disabled'''.
#Click '''Save'''.


# <span style="color: #000000; font-weight: 400; text-decoration: none;">Set the Name Tag:  e.g. </span>''<span style="color: #000000; font-weight: 400; text-decoration: none;">Untangle - Public</span>''
== Step 7. Create a route table ==
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Set the availability zone: e.g.</span>''<span style="color: #000000; font-weight: 400; text-decoration: none;"> us-east-1a</span>''
To direct traffic through your NG Firewall instance you must create a [https://docs.aws.amazon.com/vpc/latest/userguide/VPC_Route_Tables.html route table] with NG Firewall as a gateway and associate it with the internal subnet.
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Set network address:</span> <span style="color: #000000; font-weight: 400; text-decoration: none;">e.g. </span>''<span style="color: #000000; font-weight: 400; text-decoration: none;">172.31.0.0/20</span>''
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Select “Yes Create” button</span><span style="color: #000000; font-weight: 400; text-decoration: none;"><br /></span>


#In the [https://aws.amazon.com/console AWS Management Console] go to your VPC configuration from the Services menu.
#Click '''Route Table'''.
#Click '''Create Route Table'''.[[File:Aws-create-routetable.png|thumb|none|upright=1.2|Creating a route table in AWS]]
#Assign the route table a '''Name Tag''' and the '''VPC''' containing your NG Firewall and associated instances.
#Click '''Yes, Create'''.


<span style="color: #000000; font-weight: 400; text-decoration: none;">Create the Internal Subnet:</span>
== Step 8. Add a default route ==
[[File:Aws-default-route.png|thumb|right|upright=1.2|Adding a default route to a route table in AWS]]Before adding the default route, refer to the network interfaces screen and capture the Network Interface ID of the internal interface attached to your NG Firewall instance.


# <span style="color: #000000; font-weight: 400; text-decoration: none;">Set the Name Tag: e.g. </span>''<span style="color: #000000; font-weight: 400; text-decoration: none;">Untangle - Private</span>''
#In the Route Table screen, select the route table you created in the previous step.
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Set the availability zone: e.g. </span>''<span style="color: #000000; font-weight: 400; text-decoration: none;">us-east-1a</span>''
#Select the '''Routes''' tab.  
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Set network address:</span> <span style="color: #000000; font-weight: 400; text-decoration: none;">e.g. </span>''<span style="color: #000000; font-weight: 400; text-decoration: none;">172.31.32.0/20</span>''
#Click '''Edit'''.
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Select “Yes Create” button</span>
#Click '''Add another route'''.
#In the '''Destination''' field, enter 0.0.0.0/0.
#In the '''Target''' field, enter the Network Interface ID of the internal network interface attached to your NG Firewall instance.
#Click '''Save'''.


''<span style="color: #000000; font-weight: 400; text-decoration: none;"></span>'' 
== Step 9. Associate the route table ==
 
To associate the route table to your internal subnet:
==<span style="color: #000000; font-weight: 400; text-decoration: none;">Network interfaces</span>==
#Select the new route table entry and click '''Subnet Associations''' from the configuration panel.
<span style="color: #000000; font-weight: 400; text-decoration: none;">You will need to create two network interfaces.   Create these interfaces prior to launching the Untangle AMI.  </span>
#Click '''Edit''' and associate the route table to your internal subnet.[[File:Aws-associate-subnet.png|thumb|none|upright=1.4|Associating a subnet in AWS]]
 
#Click '''Save'''.
 
<span style="color: #000000; font-weight: 400; text-decoration: none;">Create the External Interface:</span>
 
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Description: e.g  eth0 - UT Public</span>
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Subnet - select the external subnet you created:  e.g. </span>''<span style="color: #000000; font-weight: 400; text-decoration: none;">subnet-cda5bea8 us-east-1a | Untangle - Public</span>''
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Security group - select the security group you created: </span>''<span style="color: #000000; font-weight: 400; text-decoration: none;">e.g. sg-811264f0 - Untangle - Untangle</span>''
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Select the “Yes Create” button</span>
 
 
<span style="color: #000000; font-weight: 400; text-decoration: none;">Create the Internal Interface:</span>
 
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Description: e.g  eth0 - UT Private</span>
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Subnet - select the external subnet you created:  e.g. </span>''<span style="color: #000000; font-weight: 400; text-decoration: none;">subnet-cda5bea8 us-east-1a | Untangle - Public</span>''
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Security group - select the security group you created: </span>''<span style="color: #000000; font-weight: 400; text-decoration: none;">e.g. sg-811264f0 - Untangle - Untangle</span>''
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Select the “Yes Create” button</span>
 
 
<span style="color: #000000; font-weight: 400; text-decoration: none;"></span><span style="color: #000000; font-weight: 400; text-decoration: none;">Once you’ve saved the private network, you’ll need to disable the Source/Dest Check - this is so Untangle can NAT.</span>
 
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Select the Internal interface you created:</span>
# Then select the “Action” button and Select Change  Source/Desc<span style="font-size: 0.939em;"> Check</span>
# Set the Source/dest check to “Disabled”
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Select the “Save” button</span>
 
 
Create and add Public IP to External Network Interface
 
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Select the “Allocate new Address” button and </span><span style="color: #000000; font-weight: 400; text-decoration: none;">Navigate to Services → EC2 → ElasticIPs</span>
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Select the “Allocate” button:</span><span style="color: #000000; font-weight: 400; text-decoration: none;"></span>
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Select the “Close” button</span>
# Select the “Actions” button
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Select “Associate Address” from the “Actions” button menu</span>
# Select the “Network Interfaces” radio button from Resource Type
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Select the Public Network Interface you created: e.g </span>''<span style="color: #000000; font-weight: 400; text-decoration: none;">eni-f360b9e4  eth0</span>''
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Select the “Associate” button</span>
# Public IP Address is associated with the Public Interface
 
 
==<span style="color: #000000; font-weight: 400; text-decoration: none;">Routes</span>==
<span style="color: #000000; font-weight: 400; text-decoration: none;">Create a new route table and add a default route using the internal network interface you’ve created:</span>
 
<span style="color: #000000; font-weight: 400; text-decoration: none;">Navigate to Services → VPC → Route Tables </span>
 
 
<span style="color: #000000; font-weight: 400; text-decoration: none;">Select “Create Route Table”</span>
 
#<span style="color: #000000; font-weight: 400; text-decoration: none;">Set a Name Tag for the Route: e.g. </span>''<span style="color: #000000; font-weight: 400; text-decoration: none;">Untangle - Private</span>''
#<span style="color: #000000; font-weight: 400; text-decoration: none;">Select the VPC the Untangle is in:  </span>''<span style="color: #000000; font-weight: 400; text-decoration: none;">e.g. vpc-79ceo5f0</span>''
#<span style="color: #000000; font-weight: 400; text-decoration: none;">Add the default route and attach it to the internal network interface:</span>
#<span style="color: #000000; font-weight: 400; text-decoration: none;">Select the route table you just created</span>
#<span style="color: #000000; font-weight: 400; text-decoration: none;">Select the Routes tab and then the “Edit” button</span>
## <span style="color: #000000; font-weight: 400; text-decoration: none;">Destination:   0.0.0.0/0</span>
## <span style="color: #000000; font-weight: 400; text-decoration: none;">Target - select the internal Network Interface you created:  e.g. </span>''<span style="color: #000000; font-weight: 400; text-decoration: none;">eni-f360b9e4</span>''
## <span style="color: #000000; font-weight: 400; text-decoration: none;">Select the “Save” button.</span>
## Next<span style="font-size: 0.939em;">, select the Subnet Associations tab and select the “Edit” button:</span>
## <span style="color: #000000; font-weight: 400; text-decoration: none;">Select the internal subnet</span>
## The select the “Save” button:
 
 
==<span style="color: #000000; text-decoration: none;">Create Internet Gateway</span>==
<span style="color: #000000; font-weight: 400; text-decoration: none;">The VPC must have an Internet Gateway.   Most VPC will already have one pre-configured.  If one does not exist, create one:</span>
 
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Navigate to Services → VPC → Internet Gateway</span>
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Select “Create Internet Gateway” button</span>
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Enter a Name tag: e.g. VPI -IGW</span>
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Select the “Save” button</span>
 
 
==<span style="color: #434343; font-weight: 400; text-decoration: none;">Launch the Untangle - AMI</span>==
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Navigate to Services → EC2 → Select the Launch Instance Button</span>
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Select AWS Marketplace and search for Untangle</span>
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Select the “Launch” button for the Untangle NG Firewall</span>
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Select the Instance type</span>
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Select the “Next: Configure Instance Details"</span>
## <span style="color: #000000; font-weight: 400; text-decoration: none;">Subnets:  Select the External Subnet you created:</span>
### Select the “Add Device” Button
### <span style="color: #000000; font-weight: 400; text-decoration: none;">Set eth1 to the Internal Subnet you created</span>
## Select the “Next: Add Storage” Button
## <span style="color: #000000; font-weight: 400; text-decoration: none;">Select the “Next: Add Tags” Button:</span>
## <span style="color: #000000; font-weight: 400; text-decoration: none;">Tags - You can add tags to help you identify the AMI / Resources</span>
## <span style="color: #000000; font-weight: 400; text-decoration: none;">Select the “Next: Configure Security Group” button:</span>
### Configure Security Group:
### <span style="color: #000000; font-weight: 400; text-decoration: none;">Choose the “Select existing Security Group” radio button</span>
### <span style="color: #000000; font-weight: 400; text-decoration: none;">Choose the Security group you configured:</span>
## <span style="color: #000000; font-weight: 400; text-decoration: none;">Select the “Review and Launch” button:</span>
# Review your configuration - Make any adjustments if needed:
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Select the “Launch” button:</span>
## Key Pair
## <span style="color: #000000; font-weight: 400; text-decoration: none;">Select an existing key pair or create new one</span>
## <span style="color: #000000; font-weight: 400; text-decoration: none;">Select “Launch Instance” button</span>
 
 
==<span style="color: #000000; font-weight: 400; text-decoration: none;">Check your Untangle Instance </span>==
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Navigate to Services → EC2 → </span>
## <span style="color: #000000; font-weight: 400; text-decoration: none;">Verify the Instance is running</span>
## <span style="color: #000000; font-weight: 400; text-decoration: none;">Make note of the Public IP</span><span style="color: #000000; font-weight: 400; text-decoration: none;"></span>
# <span style="color: #000000; font-weight: 400; text-decoration: none;">Login to Untangle</span>
## <span style="color: #000000; font-weight: 400; text-decoration: none;">Point your browser at: https://</span>''<span style="color: #000000; font-weight: 400; text-decoration: none;"><publicIP>  e.g.: </span>''[https://34.22.127.3 ''<u>https://34.22.127.3</u>'']
## <span style="color: #000000; font-weight: 400; text-decoration: none;">Configure Untangle
<br>Your browser may show a message indicating that connecting to your new server needs caution.  This message is simply telling you that there isn't yet a server certificate in place because the server is not yet configured.  Once the Untangle setup process is complete, this warning will no longer occur when you direct a browser to your new server.

Latest revision as of 23:28, 14 May 2020

Overview

Untangle NG Firewall in relation to AWS instances and VPN tunnels.
Untangle NG Firewall in relation to AWS instances and VPN tunnels.

Untangle NG Firewall deployment in AWS can secure Internet access for other AWS instances. This scenario is useful if you have for example Amazon Workspaces and you need to apply Intrusion Prevention, Content Filtering, Bandwidth Control, and other next generation firewall capabilities to those instances. This type of deployment requires advanced Virtual Private Cloud (VPC) configuration to establish an internal subnet for AWS instances that routes through NG Firewall.

Before you begin

Step 1. Configure a Security Group

AWS instances and network interfaces inherit traffic rules defined by security groups. The security group assigned to your NG Firewall instance and instances on the private network behind NG Firewall should have an open policy to avoid conflicts. Confirm that the security group designated for your instances has rules to permit all incoming and outgoing traffic.

  1. In the AWS Management Console go to your VPC configuration from the Services menu.
  2. Click Security Groups.
  3. Select the default security group or a custom security group you designate for instances belonging to your internal subnet.
  4. In the Inbound Rules tab, click Edit.
    Security group with permissive inbound rule
  5. Add or confirm a rule allowing all traffic for all protocols where the source is 0.0.0.0/0.
  6. Confirm this same policy in the Outbound Rules tab.

Step 2. Configure a Network ACL

Network ACL with permissive inbound rule

Each subnet inherits the policies of network ACLs. Confirm that the network ACL designated for your internal subnet contain rules to permit all incoming and outgoing traffic.

  1. In the AWS Management Console go to your VPC configuration from the Services menu.
  2. Click Network ACLs.
  3. Select the default network ACL or a custom network ACL if designated for your internal subnet.
  4. In the Inbound Rules tab, click Edit.
  5. Add or confirm a rule allowing all traffic for all protocols where the source is 0.0.0.0/0.
  6. Confirm this same policy in the Outbound Rules tab.

Step 3. Create an internal subnet

AWS subnet configuration wizard

To route traffic for AWS instances through NG Firewall you must designate an internal [subnet]. You assign this subnet to network interfaces belonging to your AWS instances and NG Firewall.

  1. In the [AWS Management Console] go to your VPC configuration from the Services menu.
  2. Click Subnets.
  3. Click Create Subnet.
  4. Select the VPC containing your NG Firewall and AWS instances.
  5. Select the same availability zone as your NG Firewall instance.
  6. Assign an IPv4 block that is within the scope of your VPC.
  7. Click Create to confirm the new subnet.

Step 4. Create a network interface

Network interfaces in AWS attach to instances and facilitate network access to the VPC. The NG Firewall and instances protected by the firewall must be assigned to the internal subnet you created in the previous step. If you created your instances and network interfaces prior to creating the internal subnet, you can create new network interfaces to associate your instances to the internal subnet.

  1. In the AWS Management Console go to your EC2 configuration from the Services menu.
  2. Click Network Interfaces.
  3. Click Create Network Interface.
    AWS network interface configuration wizard
  4. Select the internal subnet you created in the previous step.
  5. Keep Private IP as auto assign.
  6. Select the permissive security group you created in the first step.
  7. Click Yes, Create.

Step 5. Attach the network interface

Attaching a network interface to an instance in AWS

After you create a network interface you must attach it to an instance.

  1. In the Network Interfaces screen select an available interface that belongs to the internal subnet.
  2. In the Actions menu choose Attach.
  3. Select the Instance ID of your NG Firewall
  4. Repeat the steps for creating and attaching network interfaces for all instances that you intend to place on the internal subnet.
If you attach a new network interface to an instance other than NG Firewall, it is recommended to detach the previous network interface to prevent traffic from bypassing NG Firewall. To detach an interface, select the network interface and choose Detach from the Actions menu.

Step 6. Disable source and destination check

Disabling source and destination check on a network interface in AWS

By default, the AWS VPC configuration prevents NAT routing. You must override this behavior by disabling source and destination check for the internal network interface of NG Firewall.

  1. In the network interfaces screen select the internal network interface attached to NG Firewall.
  2. In the Actions menu choose Change Source/Dest. Check.
  3. Set the value to Disabled.
  4. Click Save.

Step 7. Create a route table

To direct traffic through your NG Firewall instance you must create a route table with NG Firewall as a gateway and associate it with the internal subnet.

  1. In the AWS Management Console go to your VPC configuration from the Services menu.
  2. Click Route Table.
  3. Click Create Route Table.
    Creating a route table in AWS
  4. Assign the route table a Name Tag and the VPC containing your NG Firewall and associated instances.
  5. Click Yes, Create.

Step 8. Add a default route

Adding a default route to a route table in AWS

Before adding the default route, refer to the network interfaces screen and capture the Network Interface ID of the internal interface attached to your NG Firewall instance.

  1. In the Route Table screen, select the route table you created in the previous step.
  2. Select the Routes tab.
  3. Click Edit.
  4. Click Add another route.
  5. In the Destination field, enter 0.0.0.0/0.
  6. In the Target field, enter the Network Interface ID of the internal network interface attached to your NG Firewall instance.
  7. Click Save.

Step 9. Associate the route table

To associate the route table to your internal subnet:

  1. Select the new route table entry and click Subnet Associations from the configuration panel.
  2. Click Edit and associate the route table to your internal subnet.
    Associating a subnet in AWS
  3. Click Save.