I am new to the world of networking and am having a hard time understanding what a DMZ is. I understand a DMZ is where you place publicly accessible servers such as Web servers, Mail servers, etc. What I am confused about is how a DMZ is setup. Please correct me if my understanding is incorrect.
You have a router that is connected to the Internet
Behind is router is a switch (I am unsure as to whether you can have a firewall instead)
Behind the switch are the web and mail servers
There is then a firewall which has 2 network interfaces one of which is connected to the switch
The second interface is then connected to an internal switch
Behind the internal switch are the LAN hosts such as PCs, Laptops, Printers, etc.
EDIT
Is it possible for a DMZ to be setup in the following manner as well?
You have a router that is connected to the Internet
Behind the router is a a firewall with 2 network interfaces one of which is connected to the router
Behind the firewall is a switch with which the second interface is connected with
Behind the switch are the publicly accessible web and mail servers
There is a secondary firewall with 2 network interface cards one of which is connected to the switch
The second network interface card is then connected to a internal switch
Behind the internal switch are the LAN hosts such as PCs, Laptops, Printers, etc.
PeanutsMonkey
You will still want internal firewalls and Web Application Firewalls (WAF's) like Imperva (or modsecurity proxies) but even these internal areas will need to be segmented and compartmentalized. The old sandwich diagram (70's - 80's IT architecture) is a major FAIL security-wise and needs to go away. External filtering router. Connections from the outside or un trusted network are routed into-and then out of – a routing firewall to the separate network segment known as the DMZ. Connections into the trusted internal network are allowed thonly from e.
PeanutsMonkeyPeanutsMonkey
1 Answer
Think of a router/firewall with three interfaces: internet, internal, and DMZ. On the internet side you have your uplink. On the internal side, you have your non-internet facing or private hosts. On the DMZ interface you connect any hosts that are accessible directly from the internet.
dmouratidmourati
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Customers are looking for different ways to ensure inbound high availability and scale for their AWS deployments. Several options exist including traditional two device HA in active passive mode, or Auto Scaling the VM-Series.
This ALB sandwich CloudFormation Template deploys a pair of VM-Series Firewalls and 2 Web Servers with an external Application Load Balancer and either an internal Application Load Balancer or Network Load Balancer depending on which CFT is chosen.The ALB sandwich with the VM-Series is an elegant and simplified way to manually scale VM-Series deployments to address planned or projected traffic increases while also delivering multi-Availability Zone HA.
Manual scale: the ALB sandwich allows you to add, via script, or manual process, additional VM-Series firewalls can be added to the deployment to address planned/projected inbound traffic increases.
Multi-availability zone high availability: two VM-Series firewalls deployed in separate Availability Zones with traffic being distributed by the AWS load balancers enables a cloud-centric approach to resiliency and availability.
The ALB sandwich is dependent on PAN-OS 8.1 as it uses the new FQDN object for NAT rules to automatically update the IP addresses.
Instructions
Create the Bootstrap bucket place the Bootstrap.xml and init-cfg.txt files into the Config folder.
Deploy the CFT
Launch a Jumpbox into either NATGateway Subnet.
Access the Jumpbox to gain access to the Firewall GUIs.
Username/Password - pandemo/demopassword
The CFT creates a sgJumpbox Security Group for use allowing ports 22 and 3389.
Update the 'alb-internal' object with the FQDN of the Internal ALB available on the Outputs of the CFT.
Update the 'AWS-NAT-UNTRUST' object with the Firewall's Untrust IP address available on the Outputs of the CFT.
Test access do the External ALB FQDN.
#API commands to update the necessary objects
curl -X GET 'https://#Firewall Management IP#/api/?type=keygen&user=pandemo&password=demopassword' -k