Neeh, en router er en slags fordeler, når man har flere PCer over netværk og kører dem over en linje, f.eks ADSL. De nyere router har indbygget firewall fra serverens side.
Nej, Hvis du er sikker på det, behøver du kun en almindelig ADSL, men så skal du selv installere en firewall, f.eks. ZoneAlarm, den er gratis til privat brug.
Jamen, hvorfor skal jeg så betale 14 kr. ekstra om måneden, hvis jeg ikke skal bruge en router til noget? Ja ja, jeg ved godt at jeg ikke SKAL, men jeg synes ikke helt jeg er blevet klogere på hvad en router bruges til. Den deler vel ikke kun forbindelsen?
Firewall er til at beskytte mod hackere og andere, så at de ikke kan bruge din computer som server eller læse informationer uden at du giver dem lov til det og har intet med router at gøre. Det er bare en ekstraservice som routere stiller til rådighed fra teleselskaberne.
Network administrators must figure out how to deny unwanted access to the network while allowing appropriate access. Although security tools, such as passwords, callback equipment, and physical security devices are helpful, they often lack the flexibility of basic traffic filtering and the specific controls most administrators prefer. For example, a network administrator might want to allow users access to the Internet but might not want external users telnetting into the LAN. Routers provide basic traffic filtering capabilities, such as blocking Internet traf- fic, with access control lists (ACLs) . An ACL is a sequential collection of permit or deny statements that apply to addresses or upper-layer protocols. In this chapter, you learn about using standard and extended ACLs as a means to control network traffic and how ACLs are used as part of a security solution. In addition, this chapter includes tips, considerations, recommendations, and general guidelines on how to use ACLs, and includes the commands and configurations needed to create ACLs. Finally, this chapter provides examples of standard and extended ACLs and how to apply ACLs to router interfaces.
ACL Overview: ACLs are lists of instructions you apply to a router’s interface. These lists tell the router what kinds of packets to accept and what kinds of packets to deny. Acceptance and denial can be based on certain specifications, such as source address, destination address, and port number. ACLs enable you to manage traffic and scan specific packets by applying the ACL to a router interface. Any traffic going through the interface is tested against certain conditions that are part of the ACL. ACLs can be created for all routed network protocols, such as Internet Protocol (IP) and Internetwork Packet Exchange (IPX), to filter packets as the packets pass through a router. ACLs can be configured at the router to control access to a network or subnet. For example, in the Washington School District, ACLs could be used to prevent student traffic from entering the administrative network. ACLs filter network traffic by controlling whether routed packets are forwarded or blocked at the router’s interfaces. The router examines each packet to determine whether to forward or drop it, based on the conditions specified in the ACL. ACL conditions could be the source address of the traffic, the destination address of the traffic, the upper-layer protocol, or other information. ACLs must be defined on a per-protocol basis. In other words, you must define an ACL for every protocol enabled on an interface if you want to control traf- fic flow for that interface. (Note that some protocols refer to ACLs as filters .) For example, if your router interface were configured for IP, AppleTalk, and IPX, you would need to define at least three ACLs. As shown in Figure 6-1, ACLs can be used as a tool for network control by adding the flexibility to filter the packets that flow in or out of router interfaces.
hvorfor TDCnetexpress adsl...hvorfor ikke TDCbredbånds adsl...forskellen er at netexpress bruger router...og bredbånd bruger modem og evt switch...hvis du skal have flere pcér tilsluttet...det virker perfekt. Såvidt jeg forstår er netexpress et forældet produkt...og der er mange der brokker sig over deres speedstreamrouter !!
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