攻击简介 如下图所示,局域网中用户通过SwitchA和SwitchB接入连接到Gateway访问Internet。当网络中出现过多的ARP报文时,会导致网关设备CPU负载加重,影响设备正常处理用户的其它业务。另一方面,网络中过多的ARP报文会占用大量的网络带宽,引起网络堵塞,从而影响整个网络通信的正常运行。 现象描述 网络设备CPU占有率较高,正常...
Switch下挂的二层交换机上,STP域的边缘端口均没有配置stp edged-port enable; 这些端口状态发生变化时会发送TC报文,Switch收到后进行STP收敛处理,立即清除ARP表项或进行老化探测处理Switch上。 因为ARP数量比较多,发送大量ARP请求报文进行探测,收到用户的ARP应答报文比较多,超过了cpcar值,部分ARP应答报文丢弃,这些ARP...
If a user host sends a large number of IP packets with unresolvable destination IP addresses to a network device (the device has a route to the destination IP address of a packet but has no ARP entry matching the next hop of the route), the device generates a large number of ARP Miss...
old_stable = ARP_TABLE_SIZE;s8_tempty = ARP_TABLE_SIZE;u8_ti =0, age_pending =0, age_stable =0;/* oldest entry with packets on queue */s8_told_queue = ARP_TABLE_SIZE;/* its age */u8_tage_queue =0;/**
* * If an IP address is given, return a pending or stable ARP entry that matches * the address. If no match is found, create a new entry with this address set, * but in state ETHARP_EMPTY. The caller must check and possibly change the * state of the returned entry. * * If ...
To pack the MAC address table with fake MAC addresses To link a validated IP address with a bogus MAC address To throw endless ARP requests so that network hosts become packed ARP Spoofing - Step by Step Explanation The attack follows as mentioned below: Step 1: At first, the ill-in...
However, with inter-VLAN proxy ARP enabled on the Switch, Host_1 and Host_2 can communicate at Layer 3. After the Switch's interface receives an ARP Request packet whose destination address is not its own address, the Switch searches for the ARP entry (a dynamically learned or statically ...
The switch considers that the ARP packet conflicts with the gateway address, generates an ARP anti-collision entry, and discards ARP packets with the same source MAC address and VLAN ID in a specified period. This prevents ARP packets with the bogus gateway address from being broadcast in a VL...
· The IP address in the entry conflicts with a local IP address. · No local interface has an IP address in the same subnet as the IP address in the ARP entry. A long static ARP entry for a VLAN is deleted if the VLAN or VLAN interface is deleted. Procedure 1. Enter system view...
- If a match is found and the receiving interface is different from the interface in the entry with a matching sender IP address, the device performs Layer 3 forwarding. - If a match is found but the receiving interface is the same as the interface in the entry with a matching sender IP...