By default, the configuration includes a policy that matches all default application inspection traffic and applies inspection to the traffic on all interfaces (a global policy). Default application inspection traffic includes traffic to the default ports for each protocol. You can only apply one global policy, so if you want to alter the global policy, for example, to apply inspection to non-standard ports, or to add inspections that are not enabled by default, you need to either edit the default policy or disable it and apply a new one. For a list of all default ports
When filtering is enabled and a request for content is directed through the security appliance, the request is sent to the content server and to the filtering server at the same time. If the filtering server allows the connection, the security appliance forwards the response from the content server to the client that originated the request. If the filtering server denies the connection, the security appliance drops the response and sends a message or return code that indicates that the connection is not successful.
This document describes the process of setting up aÂ SnortÂ network intrusion prevention and detection system on Sun Solaris 10 (SPARC). We will be usingÂ BarnyardÂ for processing events to send to a database (to utilizeÂ BASEÂ or anotherÂ SIMÂ product). This guide will go over bothÂ PostgreSQLÂ andÂ MySQLÂ database output configurations for the sensor, and PostgreSQL for a separate example BASE console. The sensor configuration [...]
In computer networking, a Media Access Control address (MAC address) or Ethernet Hardware Address (EHA), hardware address, adapter address or physical address is a quasi-unique identifier assigned to most network adapters or network interface cards (NICs) by the manufacturer for identification. If assigned by the manufacturer, a MAC address usually encodes the manufacturer’s registered identification number.
To configure multiple switchports at the same time we use the interface range configuration command. Example: Switch(config)#interface range fastethernet0/1 – 20 Switch(config-if-range)#speed 100 Switch(config-if-range)#duplex full The previous example will hardcode the speed and duplex settings on switchports 1 to 20. But this could well have been assinging them all to the same vlan. We can [...]
When someone connects to the router, the MOTD banner (if configured) appears first, followed by the login banner and prompts. After the user successfully logs in to the router, the EXEC banner or incoming banner will be displayed, depending on the type of connection. For a reverse Telnet login, the incoming banner will be displayed. For all other connections, the router will display the EXEC banner.
In order to view the log of a Cisco router we have to enable logging. This is done using the following command global configuration command: logging buffered To view the log on the router we use the following command: show log
A terminal emulation program for TCP/IP networks such as the Internet. The Telnet program runs on your computer and connects your PC to a server on the network. You can then enter commands through the Telnet program and they will be executed as if you were entering them directly on the server console. This enables you to control the server and communicate with other servers on the network. To start a Telnet session, you must log in to a server by entering a valid username and password. Telnet is a common way to remotely control Web servers
Security is a part of every good technical administratorâ€™s game plan. Luckily the good folks at Cisco have made the task of securitizing a Cisco router fairly straightforward in design- with support given for up to five types of passwords. Taking advantage of these passwords is vital to a networkâ€™s internal security, and should be implemented where permitted.
The two most basic of passwords a Cisco router can provide support for is the enable password and enable secret commands. Depending on the IOS version, administrators will likely only need to setup the enable secret command.
There are two types of routing that can be configured on a network device- static and dynamic. Static routes are hard-coded on a network device. They tell the device exactly where to send traffic, no matter what. Dynamic routes, on the other hand, use a routing protocol to determine the best path. If one route becomes less preferred, the route being used may change. With dynamic routes, routes communicate with each other and exchange routing information. Examples of dynamic routing protocols are RIP, EIGRP, OSPF, and BG
Dynamic Host Configuration Protocol (DHCP) is a network protocol that enables a server to automatically assign an IP address to an individual computer’s TCP/IP stack software. DHCP assigns a number dynamically from a defined range of numbers (i.e., a scope) configured for a given network.
In computer networking, network address translation (NAT) is the process of modifying network address information in datagram packet headers while in transit across a traffic routing device for the purpose of remapping a given address space into another
Hot Standby Router Protocol (HSRP) is designed to support non-disruptive failover of IP traffic in certain circumstances and to allow hosts to appear to use a single router and to maintain connectivity even if the actual first hop router they are using fails. In other words, HSRP protects against the failure of the first hop router when the source host cannot learn the IP address of the first hop router dynamically. Multiple routers participate in HSRP and in concert create the illusion of a single virtual router. HSRP insures that one and only one of the routers is forwarding packets on behalf of the virtual router. End hosts forward their packets to the virtual router.
TFTP (trivial file transfer protocol) provides a convenient means of quickly transferring a Cisco IOS image to a firewall over an ethernet interface. This procedure is substantially faster than transferring over a serial port. Step 1: Copy the IOS binary file to the TFTP directory. By default on most UNIX systems, the default data directory [...]
Encrypted remote sessions to PIX Firewalls with SSH. Secure SHell (SSH) provides encrypted terminal sessions, along with a lot of other neat features. www.cisco.com has configuration examples for practically everything under the planet, including the start for this one. To configure a Cisco PIX Firewall to support SSH, enter the following commands: hostname myfirewall domain-name [...]