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網絡技術是從1990年代中期發展起來的新技術，它把互聯網上分散的資源融為有機整體，實現資源的全面共享和有機協作，使人們能夠透明地使用資源的整體能力并按需獲取信息。資源包括高性能計算機、存儲資源、數據資源、信息資源、知識資源、專家資源、大型數據庫、網絡、傳感器等。 當前的互聯網只限于信息共享，網絡則被認為是互聯網發展的第三階段。 什么才是軟路由防火墻呢？如何進行軟路由防火墻的配置呢？也許很多人還不是特別的了解，其實軟路由防火墻的主要作用就是保證我們的網絡安全，阻止黑客、病毒以及其他潛在的網絡危害，下面我們就介紹一下軟路由防火墻策略的配置語句。
- add chain=input connection-state=established action=accept \
- comment="Established connections" disabled=no
- add chain=input connection-state=related action=accept comment="Related \
- connections" disabled=no
- add chain=input connection-state=invalid action=drop comment="Drop invalid \
- connections" disabled=no
- add chain=input action=jump jump-target=viruses comment="!!!Viruse \
- detection!!!" disabled=no
- add chain=input protocol=udp action=accept comment="UDP protocol" disabled=no
- add chain=input protocol=icmp action=accept comment="ICMP protocol" \
- disabled=no
- add chain=input src-address=192.168.1.0/24 action=accept comment="From local \
- netword 192.168.1.0/24" disabled=no
- add chain=input protocol=tcp dst-port=1723 action=accept comment="Allow PPTP" \
- disabled=no
- add chain=input protocol=gre action=accept comment="" disabled=no
- add chain=input protocol=tcp dst-port=21 action=accept comment="Allow \
- FTP,SSH,TELNET,WEB,WINBOX to router" disabled=no
- add chain=input protocol=tcp dst-port=22 action=accept comment="" disabled=no
- add chain=input protocol=tcp dst-port=23 action=accept comment="" disabled=no
- add chain=input protocol=tcp dst-port=80 action=accept comment="" disabled=no
- add chain=input protocol=tcp dst-port=8291 action=accept comment="" \
- disabled=no
- add chain=input protocol=tcp dst-port=9998 action=accept comment="Allow \
- digital video recorder TCP:9998 UDP:9998" disabled=no
- add chain=input protocol=udp dst-port=9998 action=accept comment="" \
- disabled=no
- add chain=input action=drop comment="Drop everything else" disabled=no
- add chain=forward connection-state=established action=accept \
- comment="Established connections" disabled=no
- add chain=forward connection-state=related action=accept comment="Related \
- connections" disabled=no
- add chain=forward connection-state=invalid action=drop comment="Drop invalid \
- connections" disabled=no
- add chain=forward action=jump jump-target=viruses comment="!!!Viruse \
- detection!!!" disabled=no
- add chain=forward protocol=udp action=accept comment="UDP protocol" \
- disabled=no
- add chain=forward protocol=icmp action=accept comment="ICMP protocol" \
- disabled=no
- add chain=forward src-address=192.168.1.0/24 action=accept comment="From local \
- netword 192.168.1.0/24" disabled=no
- add chain=forward action=drop comment="Drop everything else" disabled=no
- add chain=output connection-state=established action=accept \
- comment="Established connections" disabled=no
- add chain=output connection-state=related action=accept comment="Related \
- connections" disabled=no
- add chain=output connection-state=invalid action=drop comment="Drop invalid \
- connections" disabled=no
- add chain=viruses protocol=tcp dst-port=135-139 action=drop comment="Drop port \
- TCP/UDP 135-139" disabled=no
- add chain=viruses protocol=udp dst-port=135-139 action=drop comment="" \
- disabled=no
-
網絡的神奇作用吸引著越來越多的用戶加入其中，正因如此，網絡的承受能力也面臨著越來越嚴峻的考驗―從硬件上、軟件上、所用標準上......，各項技術都需要適時應勢，對應發展，這正是網絡迅速走向進步的催化劑。
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