In the security monitoring project work mode, the network camera monitoring generally operates around four modes, ie, gateway mode, bridge mode, bypass mode, and listening mode. This article will briefly introduce the four operating modes and their principles. :
Gateway mode <br> <br> principle is this machine as a gateway to other computers (set the video surveillance is directed to the machine's default gateway computer), respectively, can be used as a single card and dual card mode even multi-card mode, the original PROXY mode At present, the basic elimination is no longer used by people. At present, NAT is commonly used as a storage and forwarding method. It is a bit like a router to work. Therefore, the control is very strong, but because of the way of store and forward, the performance is somewhat lost; The efficiency is already better; the flaw is that if the gateway is dead, the whole network is paralyzed;
<br> <br> bridge mode principle is Ethernet Adapter made transparent bridge, and the bridge is working in the second layer, it can be understood as a simple bridge as a network cable, and therefore the best performance with little loss; WINPCAP itself Does not support this mode; this mode can be said to be the best, even if the bridge is broken, as long as a simple jumper can be, because the bridge is transparent can be seen as a network cable, even if the bridge is broken can be understood as a network cable It's just a bad one; it supports almost all network conditions such as multi-VLAN, wireless, multi-million M, and VPN, multiple exports, and so on. The reason is very simple, because the transparent bridge is understood to be the network cable.
Bypass mode <br> <br> principle is to use technology to create a virtual gateway ARP, only suitable for small network monitoring, and the environment can not be restricted bypass mode; restriction or supervision of routing or firewall computer firewall installed ARP It will lead to unbypassed success. Because you are bypassing while bypassing bypass, it is self-contradictory; at the same time, if there are multiple bypasses in the network at the same time, it will lead to confusion and disruption of the network; but as long as the method is the simplest Deployment and most convenient installation settings;
The principle is to attend mode <br> <br> bypass monitoring, as two people on the edge of a phone and listening machine, the efficiency is very low, this model requires the use of shared HUB or switch mirror; but as the use of old-fashioned The shared HUB will affect the network export function; if you use the mirror mode, you need to invest in supporting two-way mirror switch devices on the one hand, and you need professional people to set up the mirror switch on the other hand, but some switches may obstruct or reduce the switch during the blocking process. Network function; and the fundamental problem is that it is very functional and lost;
D1Net reviews:
As far as the auditory mode is concerned, the principle defect of the auditing mode causes UDP blocking to fail to be realized perfectly, and it also severely loses the bandwidth of the network network camera. At the same time, it cannot achieve good functions such as flow restriction; generally, at least 40% of the network is lost. Performance; and WINPCAP is to use this mode of work, because of whether or not it is a function of the fundamentally determine the defects generated.
Gateway mode <br> <br> principle is this machine as a gateway to other computers (set the video surveillance is directed to the machine's default gateway computer), respectively, can be used as a single card and dual card mode even multi-card mode, the original PROXY mode At present, the basic elimination is no longer used by people. At present, NAT is commonly used as a storage and forwarding method. It is a bit like a router to work. Therefore, the control is very strong, but because of the way of store and forward, the performance is somewhat lost; The efficiency is already better; the flaw is that if the gateway is dead, the whole network is paralyzed;
<br> <br> bridge mode principle is Ethernet Adapter made transparent bridge, and the bridge is working in the second layer, it can be understood as a simple bridge as a network cable, and therefore the best performance with little loss; WINPCAP itself Does not support this mode; this mode can be said to be the best, even if the bridge is broken, as long as a simple jumper can be, because the bridge is transparent can be seen as a network cable, even if the bridge is broken can be understood as a network cable It's just a bad one; it supports almost all network conditions such as multi-VLAN, wireless, multi-million M, and VPN, multiple exports, and so on. The reason is very simple, because the transparent bridge is understood to be the network cable.
Bypass mode <br> <br> principle is to use technology to create a virtual gateway ARP, only suitable for small network monitoring, and the environment can not be restricted bypass mode; restriction or supervision of routing or firewall computer firewall installed ARP It will lead to unbypassed success. Because you are bypassing while bypassing bypass, it is self-contradictory; at the same time, if there are multiple bypasses in the network at the same time, it will lead to confusion and disruption of the network; but as long as the method is the simplest Deployment and most convenient installation settings;
The principle is to attend mode <br> <br> bypass monitoring, as two people on the edge of a phone and listening machine, the efficiency is very low, this model requires the use of shared HUB or switch mirror; but as the use of old-fashioned The shared HUB will affect the network export function; if you use the mirror mode, you need to invest in supporting two-way mirror switch devices on the one hand, and you need professional people to set up the mirror switch on the other hand, but some switches may obstruct or reduce the switch during the blocking process. Network function; and the fundamental problem is that it is very functional and lost;
D1Net reviews:
As far as the auditory mode is concerned, the principle defect of the auditing mode causes UDP blocking to fail to be realized perfectly, and it also severely loses the bandwidth of the network network camera. At the same time, it cannot achieve good functions such as flow restriction; generally, at least 40% of the network is lost. Performance; and WINPCAP is to use this mode of work, because of whether or not it is a function of the fundamentally determine the defects generated.
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