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Security and firewalls

It is a risky game to allow external access to LAN resources ...
But exactly this is what DynAccess is for ....

Please take a minute's time for your security.

For many years this was a topic which no-one spoke about - computer crime via the internet. In the mid- to late 90s - at the time of the boot-sector virus - the main point of attack for "bad boys" (also known as hackers) was at first the file system in Windows 95/98, which was often freely available to anyone.

However, for a few years now we have had to be concerned with Trojans which can be caught via email or even when surfing the web.
Operating systems have security holes via which the computers can be attacked, even when everything is correctly configured.

A system administrator
who doesn't give this enough thought
will someday be unpleasantly surprised..

But security has its price. There are diverse solutions at vastly different prices for various levels of professionality.
The main thing is to keep the software you use up to date. In addition, the use of a firewall is essential.

A very trivial firewall is offered by NAT routers which, due to the technique used (IP masquerading), make external access to internal LAN workstations impossible.
Some hardware-router suppliers (e.g. Lancom-Systems) have extended their products with real firewall functionality - for example intruder detection.

Personal firewalls are software solutions which are installed on the local workstation and are implemented in the TCP/IP stack such that the entire data traffic is monitored. The user can now decide what rights are given to which programs in order to establish a connection from inside to outside. This functionality provides an advantage compared to the NAT firewall of a hardware router.

A further group of firewalls are security-gateway appliances, which in addition to the configuration of complex firewall rules also offer proxy servers for diverse services such as SMTP and HTTP.
These appliances monitor the contents of the data transferred and block if a virus, Trojan etc is recognised.

Our advice:
Inform yourself what risks can arise for you if you make LAN resources available over the internet. Also inform yourself about techniques which allow you to safely run servers on the internet. For example, VPN was developed in order to be able to set up cheap and safe site networks over the internet where, previously, dedicated permanent connections were needed.
Keep in mind that there can never be 100% security. Suppliers of professional systems will always offer you a maintenance contract - for times are changing quickly. One must react quickly to new threats. Automatic updates, not only of virus-scanner signatures, are important.

Overview: personal firewalls

Blackice Defender approx. 50 EUR
Esafe Desktop free
Lockdown Millenium approx. 110 EUR
McAfee Personal Firewall approx. 50 EUR
Norman Personal Firewall approx. 50 EUR
Norton Personal Firewall approx. 50 EUR
Secure 4U approx. 50 EUR / free
Sphinx Personal Firewall approx. 50 EUR
Sygate Personal Firewall free
Tiny Personal Firewall free
Zone Alarm approx. 50 EUR / free
Products listed as free are free only for private use!

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