描述
1797-OE8
網(wǎng)絡(luò)防火墻通過設(shè)置不同的安全規(guī)則來控制設(shè)備或系統(tǒng)之間的數(shù)據(jù)流，在實(shí)際應(yīng)用中主要用于分析與互聯(lián)網(wǎng)連接的TCP/IP協(xié)議簇。防火墻在網(wǎng)絡(luò)中使用的前提是必須保證網(wǎng)絡(luò)的連通性，其通過規(guī)則設(shè)置和協(xié)議分析，來限制和過濾那些對(duì)管理比較敏感、不安全的信息，防止未經(jīng)授權(quán)的訪問。由于工業(yè)控制與商用網(wǎng)絡(luò)的差異，常規(guī)的網(wǎng)絡(luò)安全設(shè)置規(guī)則用在控制網(wǎng)絡(luò)上就會(huì)存在很多問題。只有正確地設(shè)計(jì)、配置和維護(hù)硬件防火墻的規(guī)則，才可以保護(hù)工業(yè)控制網(wǎng)絡(luò)系統(tǒng)的安全環(huán)境。建議設(shè)置的特殊規(guī)則包括：
SCADA和工業(yè)協(xié)議。MODBUS/TCP、EtherNet/IP和DNP3等在工業(yè)控制系統(tǒng)中被大量使用，但是這些協(xié)議在設(shè)計(jì)時(shí)沒有安全加密機(jī)制，通常也不會(huì)要求任何認(rèn)證便可以在遠(yuǎn)程對(duì)一個(gè)控制裝置執(zhí)行命令。這些協(xié)議應(yīng)該只被允許在控制網(wǎng)絡(luò)單向傳輸，不準(zhǔn)許在辦公網(wǎng)絡(luò)穿透到控制網(wǎng)絡(luò)。能夠完成這一功能的工業(yè)防火墻或者安全路由器，通常被部署在具有以太網(wǎng)接口的I/O設(shè)備和控制器上，從而避免因設(shè)備聯(lián)網(wǎng)而造成的病毒攻擊或廣播風(fēng)暴，還可以避免各子系統(tǒng)間的病毒攻擊和干擾。
分布式組件對(duì)象模型(DCOM)。在過程控制中，OLE和ProfiNet(OPC)是使用DCOM的，它運(yùn)用了微軟的遠(yuǎn)程過程調(diào)用服務(wù)。該服務(wù)有很多的漏洞，很多病毒都會(huì)利用這個(gè)弱點(diǎn)獲取系統(tǒng)權(quán)限。此外OPC也利用DCOM動(dòng)態(tài)地打開任意端口，這在防火墻中進(jìn)行過濾是非常困難的。通用防火墻無法完成對(duì)OPC協(xié)議的規(guī)則限制，如果必須需要該協(xié)議，則要求控制網(wǎng)絡(luò)、網(wǎng)絡(luò)之間必須物理分開，將控制網(wǎng)絡(luò)和企業(yè)網(wǎng)絡(luò)橫向隔離。
產(chǎn)品承諾：
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢(shì)價(jià)格，大量現(xiàn)貨。
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機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國(guó)內(nèi)實(shí)力庫(kù)存商家
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