Non-verbal Messages: Non-verbal language speaks larger than words. As you walk in the interview room, here are a few things that you must keep in mind: Start it off like a winner. Â· The handshake: Offer your hand, and give a firm handshake, a pleasant smile and a positive and confident attitude. Introduce yourself. Â· [...]
Most Linux distributions ship with tcp_wrappers “wrapping” all your TCP services. A tcp_wrapper (known asÂ /usr/sbin/tcpd) is invoked from/sbin/inetdÂ instead of the real service, such asÂ telnetÂ orÂ ftp.Â tcpdÂ then checks the host that is requesting the service and either executes the real server or denies access from that host.Â tcpdÂ allows you to restrict access to your tcp services. You should make [...]
syslog is a standard for forwarding log messages in an IP network. The term “syslog” is often used for both the actual syslog protocol, as well as the application or library sending syslog messages .
Syslog is a client/server protocol: the syslog sender sends a small (less than 1KB) textual message to the syslog receiver. The receiver is commonly called “syslogd”, “syslog daemon” or “syslog server”. Syslog messages can be sent via UDP and/or TCP. The data is sent in cleartext; although not part of the syslog protocol itself, an SSL wrapper can be used to provide for a layer of encryption through SSL/TLS.
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.
Logging is rated on 8 different levels. â€œ0â€³ or Emergency is for catastrophic errors like shutdown or loss of connectivity to the inside. Level â€œ7â€³ is debugging information, REALLY in-depth information on even the smallest detail. Debugging should only be used for short periods of time to isolate an issue because it generates so much information. Whatever logging level you use, it will automatically log the lower levels as well. For example, a good place to start is logging level 4 or the warning level. A good thing to remember is when you set logging 4, you get levels 3, 2, 1 and 0, as well.
Rsyslog is an enhanced syslogd supporting, among others, MySQL, PostgreSQL, failover log destinations, syslog/tcp, fine grain output format control, high precision timestamps, queued operations and the ability to filter on any message part. It is quite compatible to stock sysklogd and can be used as a drop-in replacement. Its advanced features make it suitable for [...]
Below are a collection of popular Linux/Unix forums which I found to enjoy a strong community backing. Linux Questions.org – One of the foremost Linux forums which has a very strong community following. I may add that it is one of the most active Linux/Unix forums I have come across in recent times. Ubuntu Forums [...]
Introduction This configuration allows a central Cisco Secure PIX Firewall to communicate with networks behind two other PIX Firewall boxes through VPN tunnels over the Internet or any public network using IPsec. The two outlying networks have no need to communicate with each other, but there is connectivity to the central network. The two outlying [...]
Most Cisco devices use the syslog protocol to manage system logs and alerts. But unlike their PC and server counterparts, Cisco devices lack large internal storage space for storing these logs. To overcome this limitation, Cisco devices offer the following two options: * Internal bufferâ€” The device’s operating system allocates a small part of memory [...]
This section describes an example configuration for using pre-shared keys. It contains the following topics: Scenario Description Configuring PIX Firewall 1 with VPN Tunneling Configuring PIX Firewall 2 for VPN Tunneling If you have a limited number of registered IP addresses and you cannot use PAT, you can configure PIXÂ Firewall to use NAT for connections [...]