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发表于 2002-5-3 03:15:42
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Firewall, Proxy and Internal IP
1. Firewall is a filter to prevent some traffic to go into/out of internal network thru Ip, Port, tcp/udp, login, ...
The internal network can use public ip or private ip. If it is private ip, the firewall should support NAT, ie IP mapping
2. Proxy is basically NAT. So no matter what ip (private or public) you use, ip will be mapped to the public ip bound to the external NIC.
3. So, firewall and proxy are very often include each other and this 2 concepts are mis-used on the software and hardware products.
4. In your case, to provide www or ftp or whatever from inside firewall/proxy, you need MAPPING, NO Filtering and so on. |
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狗仔卡
恢复卡
发表于 2002-5-6 14:25:01