Wired client workgroup9/5/2023 ![]() the Wi-Fi network) in your home is a good example of a small client-server network. Let me also point out that each VLAN segment can be “stretched” over many access devices (access switches) within the local network, while one physical switch can host many VLAN segments.The Wireless LAN (Wireless Local Area Network, i.e. It’s worth adding that VLAN is a functionality provided by the best quality switches on the market, like Cisco Catalyst 9200 series. limit the impact and scale of a potential attack), and on the other, isolate user system groups by their role, for example. VLANs are local logic networks that, on the one hand, limit the broadcasting segment (i.e. This will not ensure complete protection of the infrastructure, but it’s the first step towards securing access networks. In this particular case, we’re talking about segmentation with VLAN, meaning partitioning each network by logic in the data link layer (L2). Using basic techniques of traffic segmentation, we can limit and control the so-called broadcasting domains, to which the attacker’s activities will be restricted upon breaching the access barrier. They are the ones that aggregate all wired network sockets, floor boxes, and access devices.Īn example would be protecting the access to the distribution cabinet, starting with the switch itself, for instance by enabling 802.1x mechanisms that will prevent any outsiders from physically connecting to the port to start communications in the LAN. We can’t put a padlock on a network port, but we have a variety of mechanisms and good practices at our disposal, which can help us protect access ports or Ethernet switches. That’s why it’s worthwhile to develop detailed procedures for moving within the building’s zones and the business grounds, as well as provide periodic training for the employees.Īnother defensive element could be simply securing the wired access network. Of course, by using suggestions or taking advantage of the lack of awareness of employees, the attacker can beat these protections and get into the desired areas of the building. Room access control and central authentication would be the first barrier for the attacker to overcome. When talking about access to the wired network, we mean the facilities, factories, rooms, open office spaces, so specific, physical places. ![]() How to secure the LAN network? Physical security extorting the login and password to the victim’s electronic banking system. An attack of this kind can result in, e.g. The phishing website is prepared in such a way that it looks exactly like the bank’s. The attack victim will then use the planted DNS server while, for instance, opening his bank’s website, and the attacker will redirect the victim’s traffic to any target server that imitates the bank’s server. extort information – so-called phishing), putting in his DNS server’s address in the DHCP offer message would do the trick. If the attacker launches his DNS server just to route traffic to a server that was doctored beforehand (e.g. Most of today’s communication over the Internet is based on this service. The DNS (Domain Name System) is a key service by itself, and its task is to translate names (FQDN) into IP addresses. One of the pieces of information passed by the DHCP server during the process of obtaining IP by the client is also the DNS server address. This can facilitate the so-called Man in the Middle attack, which is acting as an intermediary between the victim’s computer and the targeted systems, which leads to data alteration or tapping the communications of an unaware user that is the victim of the MITM attack.Īnother problem is the possibility of using a planted DNS server. This way it can route all default client network’s outgoing traffic through the attacker’s computer. closer to the client) than the actual DHCP server and sends the IP information that has the attacking computer’s IP in the gateway field, the attacker then assumes the role of a default gateway for this computer. Please note that the DHCP server allocates a host of other information along with the IP, one of which is the default gateway IP, which is the node/device responsible for all routing outside the local subnetwork. The number one problem occurs when the attacker’s connected device spoofs the address managing server (DHCP). The broadcasting medium is prone to security breaches mainly due to the nature of the network. ![]() Enterprise Wireless: Cisco Products Overview.
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