Month: August 2012


IPSec is basically a way to secure the data transfer between computers. IPSec is making data traffic between two nodes secure by making these things:

  • Data Authentication
    • Authentication – The packets can be spoofed and not sent from the place they seem they are sent. Data origin authentication can be provided with configuration of IPSec. IPSec will enable us to ensure that received packet from a trusted party is really originating from that party.
    • Data integrity – IPSec can be configured to secure that the data packet are not changed when they are crossing the network.
    • Anti-replay protection – IPSec is able to check that the packets received are not duplicates of previous data packets.
  • Encryption
    • IPSec is a technology that enables you to encrypt network data so that it cannot be captured and used by unauthorized persons.

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Application Layer Firewalls

application layer firewallCircuit-level firewalls are ok but if you want to make your network more secure these firewalls will not be enough for you. Better line of defense is to use new kind of firewall that are making deeper packet analyze, application layer firewalls. Application layer firewalls, also called application gateways or proxy firewalls. These firewalls are filtering traffic at 3, 4, 5, 7 OSI layer.

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Pathping more than handy network troubleshooting tool

This useful troubleshooting command for cmd provides information about network speed and network loss at every node between a source and destination. Pathping sends Echo Requests to every router between a source and destination and then calculates the results based on the packets returned from every device. By displaying the percentage of packet loss at any given node, we can see which router have some network problems. Pathping is making the same thing like tracert command but with more information about every router on the way.

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