2 cissp ® Official Study Guide Eighth Edition



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(CISSP) Mike Chapple, James Michael Stewart, Darril Gibson - CISSP Official Study Guide-Sybex (2018)

Multihomed Firewalls 
Some fi rewall systems have more than one interface. For instance, a
multihomed fi rewall
must have at least two interfaces to fi lter traffi c (they’re also known as dual-homed fi re-
walls). All multihomed fi rewalls should have IP forwarding, which automatically sends traf-
fi c to another interface, disabled. This will force the fi ltering rules to control all traffi c rather 
than allowing a software-supported shortcut between one interface and another. A
bastion 
host
is a computer or appliance that is exposed on the internet and has been hardened by 
removing all unnecessary elements, such as services, programs, protocols, and ports. A 
screened host
is a fi rewall-protected system logically positioned just inside a private network. 
All inbound traffi c is routed to the screened host, which in turn acts as a proxy for all the 
trusted systems within the private network. It is responsible for fi ltering traffi c coming into 
the private network as well as for protecting the identity of the internal client. 
The word
bastion 
comes from medieval castle architecture. A bastion 
guardhouse was positioned in front of the main entrance to serve as a first 
layer of protection. Using this term to describe a host indicates that the 
system is acting as a sacrificial host that will receive all inbound attacks.
A screened subnet is similar to the screened host in concept, except a subnet is placed 
between two routers or fi rewalls and the bastion host(s) is located within that subnet. All 
inbound traffi c is directed to the bastion host, and only authorized traffi c can pass through 
the second router/fi rewall into the private network. This creates a subnet where some 
external visitors are allowed to communicate with resources offered by the network. This 
is the concept of a DMZ, which is a network area (usually a subnet) that is designed to be 
accessed by outside visitors but that is still isolated from the private network of the organi-
zation. The DMZ is often the host of public web, email, fi le, and other resource servers.

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