This document describes how to configure port forwarding on a Cyberoam device using virtual hosts to allow external access to internal servers. It involves creating virtual hosts mapped to the internal servers' IP addresses, which will forward traffic for the public IP to the private IPs. Firewall rules must then be created to allow the incoming traffic to the virtual host IPs and services. The configuration uses a sample network with a web and mail server in the DMZ zone accessible externally via public IPs mapped to their private DMZ IPs.
Complete confidence in my skills and abilities to serve as a member of your IT team. If you seek professional IT System and Network Administrator, it will be my genuine pleasure to work for you.
I have a solid experience with Microsoft Infrastructure with almost 7 years of experience in the IT Field, and I am seeking a new opportunity, if you would like to arrange for a meeting, I'm available at your earliest convenience.
Complete confidence in my skills and abilities to serve as a member of your IT team. If you seek professional IT System and Network Administrator, it will be my genuine pleasure to work for you.
I have a solid experience with Microsoft Infrastructure with almost 7 years of experience in the IT Field, and I am seeking a new opportunity, if you would like to arrange for a meeting, I'm available at your earliest convenience.
This presentation was presented at MUM Indonesia at Bali in 2008. Discussed about how to put extra layer of security into your MikroTik Router using Port Knocking mechanism.
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This presentation was presented at MUM Indonesia at Bali in 2008. Discussed about how to put extra layer of security into your MikroTik Router using Port Knocking mechanism.
Secure Network Design with High-Availability & VoIPArpan Patel
Networking, the communication between two or more networks, encompasses every aspect of connecting computers together. With the evolution of networking and the Internet, the threats to
information and networks have risen dramatically and performance has depleted enormously.
As a company grows its business its network design needs to be updated from the existing network
and expand it to accommodate additional users or workloads. But the diculty arises as networks
are being pressured to cost less, yet support the emerging applications and higher number of users
with increased performance. As personal, government and business-critical applications become
more prevalent on the Internet, it is imperative that all networks be protected from threats and
vulnerabilities in order for a business to achieve its fullest potential. Hence a Secure Design for a
network is critical in todays expanding corporate world.
This is an introductory presentation regarding the issues in designing a campus network infrastructure. Unlike theoretical approaches, this presentation actually was used to describe some of the real configurations performed by Server Administrators and Network Managers. This is for an introductory audience with very little background in computer networks assumed.
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Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
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Malware and malicious payload trends
Cyberattack types and targets
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How to -_configure_port_forwarding_using_virtual_host_to_access_devices_on_internal_network
1. How To – Configure Port Forwarding using Virtual Host to access devices on Internal network
How To – Configure Port Forwarding using Virtual Host
to access devices on Internal network
Applicable to – versions 9.5.3 build 14 or above
This article describes a detailed configuration example that demonstrates how to configure
Cyberoam to provide the access of internal resources.
Article covers how to
Create virtual host
Create firewall rule to allow the inbound traffic
Virtual host
Virtual host implementation is based on the Destination NAT concept of older versions of
Cyberoam.
Virtual Host maps services of a public IP address to services of a host in a private network. In
other words it is a mapping of public IP address to an internal IP address. This virtual host is
used as the Destination address to access internal or DMZ server.
A Virtual host can be a single IP address or an IP address range or Cyberoam interface itself.
Cyberoam will automatically respond to the ARP request received on the WAN zone for the
external IP address of Virtual host.
Sample schema
Throughout the article we will use the network parameters displayed in the below given
network diagram. Outbound traffic from LAN and DMZ is allowed while inbound traffic is
restricted. The public servers - mail and web server are hosted in DMZ.
Network External IP address
IP address (Internal)
components (Public)
Web server 203.88.135.208 192.168.1.4 (Mapped)
Mail server 204.88.135.192 192.168.1.15
(Mapped)
For virtual host:
External IP: IP address through which Internet user’s access internal server.
Mapped IP: IP address bound to the internal server.
2. How To – Configure Port Forwarding using Virtual Host to access devices on Internal network
Configuration
Entire configuration is to be done from Web Admin Console unless specified.
Step 1: Create virtual host for Web server
Go to Firewall Virtual Host Create and create virtual host with the parameters as
specified in sample schema
In our example, Internet users will access internal web server using public IP 203.88.135.208
which is mapped to local IP 192.168.1.4. In other words, all the inbound requests from
203.88.135.208 will be forwarded to 192.168.1.4.
3. How To – Configure Port Forwarding using Virtual Host to access devices on Internal network
Note
If servers are hosted on LAN, change the Physical Zone to LAN.
In case you have custom zones, change the Physical Zones accordingly.
Public IP address is the IP address through which Internet user’s access internal
server/host. If public IP address is already configured as main Interface IP or alias IP,
then use the option – Interface IP to select it as an external IP or else select the option
IP and add the Public IP Address.
Step 2: Create virtual host for Mail server
Go to Firewall Virtual Host Create and create virtual host with the parameters as
specified in sample schema
In our example, Internet users will access internal mail server using public IP 203.88.135.192
which is mapped to local IP 192.168.1.15. In other words, all the inbound requests from
203.88.135.192 will be forwarded to 192.168.1.15.
4. How To – Configure Port Forwarding using Virtual Host to access devices on Internal network
Step 3: Loopback firewall rule
Once the virtual host is created successfully, Cyberoam automatically creates a loopback
firewall rule for the zone of the mapped IP address. Loopback firewall rule is created for the
service specified in virtual host.
Loopback rules allow same zone internal users to access the internal resources using its
public IP (external IP) or FQDN.
5. How To – Configure Port Forwarding using Virtual Host to access devices on Internal network
For our example, DMZ to DMZ firewall rule is created as virtual host (mapped IP address)
belongs to DMZ interface subnet.
Check creation of loopback rule from Firewall Manage Firewall
Step 4: Add Firewall rules
Rule 1
Go to Firewall Create Rule and create firewall rule for each server with the
parameters as displayed in the below given screens.
Click Create and the Firewall Rule for Webserver will be created successfully.
6. How To – Configure Port Forwarding using Virtual Host to access devices on Internal network
Click Create and the Firewall Rule for Mailserver will be created successfully.
Note
Change the Destination Host according to the actual server Location (Zone).
To create firewall rules to allow internal users to access resources in DMZ using its public IP
(external IP) or FQDN follow the below mentioned steps:
Go to Firewall Create Rule and create firewall rule for each server with the
parameters as displayed in the below given screens.
Click Create and the Firewall Rule for Webserver will be created successfully.
7. How To – Configure Port Forwarding using Virtual Host to access devices on Internal network
Click Create and the Firewall Rule for Mailserver will be created successfully.
Note:
DO NOT “Apply NAT” for inbound SMTP rules. This will setup the MailServer as an OPEN
RELAY.
Document version – 3.0- 12/05/2011
