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Specialties of some Internet connection types
Connection via NAT router (Network Address Translation) If the Internet connection is realized by some other device (router) which do so called Network Address Translation (translation of IP addresses) the connection from the Proxy+ to the Internet (router) is going via the same interface as the to the LAN. It means that defining this interface as insecure denies Proxy+ services to LAN clients. In this case it's necessary to disable using Insecure interfaces (Security/General/Use insecure interfaces) and enable using Secure clients (Security/General/Use secure IP addresses) and define range of IP addresses used on your LAN. If the NAT is configured to not create links from the Internet to any computer on the LAN, the fact you use NAT means increasing security of your LAN. All computer behind such router are hidden and inaccessible. Autodetection of insecure interfaces will choose your LAN interface as insecure (as it's used for accessing the Internet router). Connection using non-public IP addresses with NAT on the provider side Client of such ISP uses non-public IP address (assigned by ISP) which is translated to public on the provider's router. As this non-public address is not accessible from the Internet (not routable) the connection itself increases security of the client from the attack from the Internet. There is still possibility of abusing Proxy+ by some other client of the same ISP. If dedicated network card or card with another IP address assigned to it (on WinNT/Win2000) is used for connection to the ISP the autodetection of insecure interfaces will work properly. Connection using non-public IP addresses and proxy server of ISP Client of such ISP uses non-public IP address (assigned by ISP mostly). Access to the Internet is possible via provider's proxy server only. As non-public IP address is not accessible from the Internet (non routable) the connection itself increases security of the client from the attack from the Internet. There is still possibility of abusing Proxy+ by some other client of the same ISP. In this case the autodetection mostly won't find any interface as the default gateway is not defined (it's not required). It's necessary to create the list of secure clients or the list of secure interfaces (if the connection to the Internet is realized via dedicated interface). |
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