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聽棣栧厛鎰熻阿鎴戠殑鍚屼簨Robin锛屽悓鎰忔斁鍒版垜鐨勫崥瀹笂璺熷ぇ瀹跺垎浜紒

聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 Author:Robin

聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 Date:2013-3-28

鍖归厤锛?span style="">match锛夛細绗﹀悎鎸囧畾鐨勬潯浠讹紝姣斿鎸囧畾鐨?span style="">聽IP聽鍦板潃鍜岀鍙ｃ€?/p>

聽涓㈠純锛?span style="">drop锛夛細褰撲竴涓寘鍒拌揪鏃讹紝绠€鍗曞湴涓㈠純锛屼笉鍋氬叾瀹冧换浣曞鐞嗐€?/p>

聽鎺ュ彈锛?span style="">accept锛夛細鍜屼涪寮冪浉鍙嶏紝鎺ュ彈杩欎釜鍖咃紝璁╄繖涓寘閫氳繃銆?/p>

聽鎷掔粷锛?span style="">reject锛夛細鍜屼涪寮冪浉浼硷紝浣嗗畠杩樹細鍚戝彂閫佽繖涓寘鐨勬簮涓绘満鍙戦€侀敊璇秷鎭€傝繖涓敊璇秷鎭彲浠ユ寚瀹氾紝涔熷彲浠ヨ嚜鍔ㄤ骇鐢熴€?/p>

聽鐩爣锛?span style="">target锛夛細鎸囧畾鐨勫姩浣滐紝璇存槑濡備綍澶勭悊涓€涓寘锛屾瘮濡傦細涓㈠純锛屾帴鍙楋紝鎴栨嫆缁濄€?/p>

聽璺宠浆锛?span style="">jump锛夛細鍜岀洰鏍囩被浼硷紝涓嶈繃瀹冩寚瀹氱殑涓嶆槸涓€涓叿浣撶殑鍔ㄤ綔锛岃€屾槸鍙︿竴涓摼锛岃〃绀鸿璺宠浆鍒伴偅涓摼涓娿€?/p>

聽瑙勫垯锛?span style="">rule锛夛細涓€涓垨澶氫釜鍖归厤鍙婂叾瀵瑰簲鐨勭洰鏍囥€?/p>

聽閾撅紙chain锛夛細姣忔潯閾鹃兘鍖呭惈鏈変竴绯诲垪鐨勮鍒欙紝杩欎簺瑙勫垯浼氳渚濇搴旂敤鍒版瘡涓亶鍘嗚閾剧殑鏁版嵁鍖呬笂銆傛瘡涓摼閮芥湁鍚勮嚜涓撻棬鐨勭敤閫旓紝 杩欎竴鐐规垜浠笅闈細璇︾粏璁ㄨ銆?/p>

聽琛紙table锛夛細姣忎釜琛ㄥ寘鍚湁鑻ュ共涓笉鍚岀殑閾撅紝姣斿聽filter聽琛ㄩ粯璁ゅ寘鍚湁聽INPUT锛?span style="">FORWARD锛?span style="">OUTPUT聽涓変釜閾俱€?span style="">iptables鏈夊洓涓〃锛屽垎鍒槸锛?span style="">raw锛?span style="">nat锛?span style="">mangle鍜?span style="">filter锛屾瘡涓〃閮芥湁鑷繁涓撻棬鐨勭敤澶勶紝姣斿鏈€甯哥敤filter琛ㄥ氨鏄笓闂ㄧ敤鏉ュ仛鍖呰繃婊ょ殑锛岃€?span style="">聽nat聽琛ㄦ槸涓撻棬鐢ㄦ潵鍋?span style="">NAT鐨勩€?/p>

聽绛栫暐锛?span style="">police锛夛細鎴戜滑鍦ㄨ繖閲屾彁鍒扮殑绛栫暐鏄寚锛屽浜?span style="">聽iptables聽涓煇鏉￠摼锛屽綋鎵€鏈夎鍒欓兘鍖归厤涓嶆垚鍔熸椂鍏堕粯璁ょ殑澶勭悊鍔ㄤ綔銆?/p>

聽杩炴帴璺熻釜锛?span style="">connection track锛夛細鍙堢О涓哄姩鎬佽繃婊わ紝鍙互鏍规嵁鎸囧畾杩炴帴鐨勭姸鎬佽繘琛屼竴浜涢€傚綋鐨勮繃婊わ紝鏄竴涓緢寮哄ぇ鐨勫姛鑳斤紝浣嗗悓鏃朵篃姣旇緝娑堣€楀唴瀛樿祫婧愩€?/p>

鍥?span style="">1缁忚繃iptables鐨勬暟鎹寘娴佺▼

鍥?span style="">1琛ㄨ揪浜嗘暟鎹寘缁忚繃iptables鐨勫熀鏈祦绋嬶紝浠庡浘涓彲灏嗘暟鎹寘鎶ユ枃鐨勫鐞嗚繃绋嬪垎涓轰笁绉嶇被鍨嬨€?/p>

鎶ユ枃浠ユ湰鏈轰负鐩殑鍦板潃鏃讹紝鍏剁粡杩?span style="">iptables鐨勮繃绋嬩负锛?/p>

1.聽聽聽聽聽鏁版嵁鍖呬粠network鍒扮綉鍗?/p>

2.聽聽聽聽聽缃戝崱鎺ユ敹鍒版暟鎹寘鍚庯紝杩涘叆raw琛ㄧ殑PREROUTING閾俱€傝繖涓摼鐨勪綔鐢ㄦ槸鍦ㄨ繛鎺ヨ窡韪箣鍓嶅鐞嗘姤鏂囷紝鑳藉璁剧疆涓€鏉¤繛鎺ヤ笉琚繛鎺ヨ窡韪鐞嗐€?span style="">(娉細涓嶈鍦?span style="">raw琛ㄤ笂娣诲姞鍏朵粬瑙勫垯)

3.聽聽聽聽聽濡傛灉璁剧疆浜嗚繛鎺ヨ窡韪紝鍒欏湪杩欐潯杩炴帴涓婂鐞嗐€?/p>

4.聽聽聽聽聽缁忚繃raw澶勭悊鍚庯紝杩涘叆mangle琛ㄧ殑PREROUTING閾俱€傝繖涓摼涓昏鏄敤鏉ヤ慨鏀规姤鏂囩殑TOS銆?span style="">TTL浠ュ強缁欐姤鏂囪缃壒娈婄殑MARK銆?span style="">(娉細閫氬父mangle琛ㄤ互缁欐姤鏂囪缃?span style="">MARK涓轰富锛屽湪杩欎釜琛ㄩ噷闈紝鍗冧竾涓嶈鍋氳繃婊?span style="">/NAT/浼杩欑被鐨勪簨鎯?span style="">)

5.聽聽聽聽聽杩涘叆nat琛ㄧ殑PREROUTING閾俱€傝繖涓摼涓昏鐢ㄦ潵澶勭悊聽DNAT锛屽簲璇ラ伩鍏嶅湪杩欐潯閾鹃噷闈㈠仛杩囨护锛屽惁鍒欏彲鑳介€犳垚鏈変簺鎶ユ枃浼氭紡鎺夈€?span style="">(娉細瀹冨彧鐢ㄦ潵瀹屾垚婧?span style="">/鐩殑鍦板潃鐨勮浆鎹?span style="">)

6.聽聽聽聽聽杩涘叆璺敱鍐冲畾鏁版嵁鍖呯殑澶勭悊銆備緥濡傚喅瀹氭姤鏂囨槸涓婃湰鏈鸿繕鏄浆鍙戞垨鑰呭叾浠栧湴鏂广€?span style="">(娉細姝ゅ鍋囪鎶ユ枃浜ょ粰鏈満澶勭悊)

7.聽聽聽聽聽杩涘叆聽mangle聽琛ㄧ殑聽INPUT聽閾俱€傚湪鎶婃姤鏂囧疄闄呴€佺粰鏈満鍓嶏紝璺敱涔嬪悗锛屾垜浠彲浠ュ啀娆′慨鏀规姤鏂囥€?/p>

8.聽聽聽聽聽杩涘叆聽filter聽琛ㄧ殑聽INPUT聽閾俱€傚湪杩欏効鎴戜滑瀵规墍鏈夐€佸線鏈満鐨勬姤鏂囪繘琛岃繃婊わ紝瑕佹敞鎰忔墍鏈夋敹鍒扮殑骞朵笖鐩殑鍦板潃涓烘湰鏈虹殑鎶ユ枃閮戒細缁忚繃杩欎釜閾撅紝鑰屼笉绠″摢涓帴鍙ｈ繘鏉ョ殑鎴栬€呭畠寰€鍝効鍘汇€?/p>

9.聽聽聽聽聽杩涜繃瑙勫垯杩囨护锛屾姤鏂囦氦鐢辨湰鍦拌繘绋嬫垨鑰呭簲鐢ㄧ▼搴忓鐞嗭紝渚嬪鏈嶅姟鍣ㄦ垨鑰呭鎴风绋嬪簭銆?/p>

鏁版嵁鍖呯敱鏈満鍙戝嚭鏃讹紝鍏剁粡杩?span style="">iptables鐨勮繃绋嬩负锛?/p>

1.聽聽聽聽聽鏈湴杩涚▼鎴栬€呭簲鐢ㄧ▼搴忥紙渚嬪鏈嶅姟鍣ㄦ垨鑰呭鎴风绋嬪簭锛夊彂鍑烘暟鎹寘銆?/p>

2.聽聽聽聽聽璺敱閫夋嫨锛岀敤鍝釜婧愬湴鍧€浠ュ強浠庡摢涓帴鍙ｄ笂鍑哄幓锛屽綋鐒惰繕鏈夊叾浠栦竴浜涘繀瑕佺殑淇℃伅銆?/p>

3.聽聽聽聽聽杩涘叆聽raw聽琛ㄧ殑聽OUTPUT聽閾俱€?杩欓噷鏄兘澶熷湪杩炴帴璺熻釜鐢熸晥鍓嶅鐞嗘姤鏂囩殑鐐癸紝鍦ㄨ繖鍙互鏍囪鏌愪釜杩炴帴涓嶈杩炴帴璺熻釜澶勭悊銆?/p>

4.聽聽聽聽聽杩炴帴璺熻釜瀵规湰鍦扮殑鏁版嵁鍖呰繘琛屽鐞嗐€?/p>

5.聽聽聽聽聽杩涘叆聽mangle聽琛ㄧ殑聽OUTPUT聽閾撅紝鍦ㄨ繖閲屾垜浠彲浠ヤ慨鏀规暟鎹寘锛屼絾涓嶈鍋氳繃婊?span style="">(浠ラ伩鍏嶅壇浣滅敤)銆?/p>

6.聽聽聽聽聽杩涘叆聽nat聽琛ㄧ殑聽OUTPUT聽閾撅紝鍙互瀵归槻鐏鑷繁鍙戝嚭鐨勬暟鎹仛鐩殑NAT(DNAT)聽銆?/p>

7.聽聽聽聽聽杩涘叆聽filter聽琛ㄧ殑聽OUTPUT聽閾撅紝鍙互瀵规湰鍦板嚭鍘荤殑鏁版嵁鍖呰繘琛岃繃婊ゃ€?/p>

8.聽聽聽聽聽鍐嶆杩涜璺敱鍐冲畾锛屽洜涓哄墠闈㈢殑聽mangle聽鍜?span style="">聽nat聽琛ㄥ彲鑳戒慨鏀逛簡鎶ユ枃鐨勮矾鐢变俊鎭€?/p>

9.聽聽聽聽聽杩涘叆聽mangle聽琛ㄧ殑聽POSTROUTING聽閾俱€傝繖鏉￠摼鍙兘琚袱绉嶆姤鏂囬亶鍘嗭紝涓€绉嶆槸杞彂鐨勬姤鏂囷紝鍙﹀灏辨槸鏈満浜х敓鐨勬姤鏂囥€?/p>

10.聽聽聽聽聽聽聽聽杩涘叆聽nat聽琛ㄧ殑聽POSTROUTING聽閾俱€傚湪杩欐垜浠仛婧?span style="">聽NAT锛?span style="">SNAT锛夛紝寤鸿浣犱笉瑕佸湪杩欏仛鎶ユ枃杩囨护锛屽洜涓烘湁鍓綔鐢ㄣ€傚嵆浣夸綘璁剧疆浜嗛粯璁ょ瓥鐣ワ紝涓€浜涙姤鏂囦篃鏈夊彲鑳芥簻杩囧幓銆?/p>

11.聽聽聽聽聽聽聽聽杩涘叆鍑哄幓鐨勭綉缁滄帴鍙ｃ€?/p>

鎶ユ枃缁忚繃iptables杩涘叆杞彂鐨勮繃绋嬩负锛?/p>

1.聽聽聽聽聽鏁版嵁鍖呬粠network鍒扮綉鍗?/p>

2.聽聽聽聽聽缃戝崱鎺ユ敹鍒版暟鎹寘鍚庯紝杩涘叆raw琛ㄧ殑PREROUTING閾俱€傝繖涓摼鐨勪綔鐢ㄦ槸鍦ㄨ繛鎺ヨ窡韪箣鍓嶅鐞嗘姤鏂囷紝鑳藉璁剧疆涓€鏉¤繛鎺ヤ笉琚繛鎺ヨ窡韪鐞嗐€?span style="">(娉細涓嶈鍦?span style="">raw琛ㄤ笂娣诲姞鍏朵粬瑙勫垯)

3.聽聽聽聽聽濡傛灉璁剧疆浜嗚繛鎺ヨ窡韪紝鍒欏湪杩欐潯杩炴帴涓婂鐞嗐€?/p>

4.聽聽聽聽聽缁忚繃raw澶勭悊鍚庯紝杩涘叆mangle琛ㄧ殑PREROUTING閾俱€傝繖涓摼涓昏鏄敤鏉ヤ慨鏀规姤鏂囩殑TOS銆?span style="">TTL浠ュ強缁欐姤鏂囪缃壒娈婄殑MARK銆?span style="">(娉細閫氬父mangle琛ㄤ互缁欐姤鏂囪缃?span style="">MARK涓轰富锛屽湪杩欎釜琛ㄩ噷闈紝鍗冧竾涓嶈鍋氳繃婊?span style="">/NAT/浼杩欑被鐨勪簨鎯?span style="">)

5.聽聽聽聽聽杩涘叆nat琛ㄧ殑PREROUTING閾俱€傝繖涓摼涓昏鐢ㄦ潵澶勭悊聽DNAT锛屽簲璇ラ伩鍏嶅湪杩欐潯閾鹃噷闈㈠仛杩囨护锛屽惁鍒欏彲鑳介€犳垚鏈変簺鎶ユ枃浼氭紡鎺夈€?span style="">(娉細瀹冨彧鐢ㄦ潵瀹屾垚婧?span style="">/鐩殑鍦板潃鐨勮浆鎹?span style="">)

6.聽聽聽聽聽杩涘叆璺敱鍐冲畾鏁版嵁鍖呯殑澶勭悊銆備緥濡傚喅瀹氭姤鏂囨槸涓婃湰鏈鸿繕鏄浆鍙戞垨鑰呭叾浠栧湴鏂广€?span style="">(娉細姝ゅ鍋囪鎶ユ枃杩涜杞彂)

7.聽聽聽聽聽杩涘叆聽mangle聽琛ㄧ殑聽FORWARD聽閾撅紝杩欓噷涔熸瘮杈冪壒娈婏紝杩欐槸鍦ㄧ涓€娆¤矾鐢卞喅瀹氫箣鍚庯紝鍦ㄨ繘琛屾渶鍚庣殑璺敱鍐冲畾涔嬪墠锛屾垜浠粛鐒跺彲浠ュ鏁版嵁鍖呰繘琛屾煇浜涗慨鏀广€?/p>

8.聽聽聽聽聽杩涘叆聽filter聽琛ㄧ殑聽FORWARD聽閾撅紝鍦ㄨ繖閲屾垜浠彲浠ュ鎵€鏈夎浆鍙戠殑鏁版嵁鍖呰繘琛岃繃婊ゃ€傞渶瑕佹敞鎰忕殑鏄細缁忚繃杩欓噷鐨勬暟鎹寘鏄浆鍙戠殑锛屾柟鍚戞槸鍙屽悜鐨勩€?/p>

9.聽聽聽聽聽杩涘叆聽mangle聽琛ㄧ殑聽POSTROUTING聽閾撅紝鍒拌繖閲屽凡缁忓仛瀹屼簡鎵€鏈夌殑璺敱鍐冲畾锛屼絾鏁版嵁鍖呬粛鐒跺湪鏈湴涓绘満锛屾垜浠繕鍙互杩涜鏌愪簺淇敼銆?/p>

10.聽聽聽聽聽聽聽聽杩涘叆聽nat聽琛ㄧ殑聽POSTROUTING聽閾撅紝鍦ㄨ繖閲屼竴鑸兘鏄敤鏉ュ仛聽SNAT聽锛屼笉瑕佸湪杩欓噷杩涜杩囨护銆?/p>

11.聽聽聽聽聽聽聽聽杩涘叆鍑哄幓鐨勭綉缁滄帴鍙ｃ€?/p>

鍥?span style="">2 iptables鐨勮〃銆侀摼鍜岃鍒欑殑鍏崇郴

瑙勫垯锛?span style="">rules锛夊叾瀹炲氨鏄綉缁滅鐞嗗憳棰勫畾涔夌殑鏉′欢锛岃鍒欎竴鑸殑瀹氫箟涓衡€滃鏋滄暟鎹寘澶寸鍚堣繖鏍风殑鏉′欢锛屽氨杩欐牱澶勭悊杩欎釜鏁版嵁鍖呪€濄€傝鍒欏瓨鍌ㄥ湪鍐呮牳绌洪棿鐨勪俊鎭寘杩囨护琛ㄤ腑锛岃繖浜涜鍒欏垎鍒寚瀹氫簡婧愬湴鍧€銆佺洰鐨勫湴鍧€銆佷紶杈撳崗璁紙濡?span style="">TCP銆?span style="">UDP銆?span style="">ICMP锛夊拰鏈嶅姟绫诲瀷锛堝HTTP銆?span style="">FTP鍜?span style="">SMTP锛夌瓑銆傚綋鏁版嵁鍖呬笌瑙勫垯鍖归厤鏃讹紝iptables灏辨牴鎹鍒欐墍瀹氫箟鐨勬柟娉曟潵澶勭悊杩欎簺鏁版嵁鍖咃紝濡傛斁琛岋紙accept锛夈€佹嫆缁濓紙reject锛夊拰涓㈠純锛?span style="">drop锛夌瓑銆傞厤缃槻鐏鐨勪富瑕佸伐浣滃氨鏄坊鍔犮€佷慨鏀瑰拰鍒犻櫎杩欎簺瑙勫垯銆?/p>

閾撅紙chains锛夋槸鏁版嵁鍖呬紶鎾殑璺緞锛屾瘡涓€鏉￠摼鍏跺疄灏辨槸浼楀瑙勫垯涓殑涓€涓鏌ユ竻鍗曪紝姣忎竴鏉￠摼涓彲浠ユ湁涓€鏉℃垨鏁版潯瑙勫垯銆傚綋涓€涓暟鎹寘鍒拌揪涓€涓摼鏃讹紝iptables灏变細浠庨摼涓涓€鏉¤鍒欏紑濮嬫鏌ワ紝鐪嬭鏁版嵁鍖呮槸鍚︽弧瓒宠鍒欐墍瀹氫箟鐨勬潯浠躲€傚鏋滄弧瓒筹紝绯荤粺灏变細鏍规嵁璇ユ潯瑙勫垯鎵€瀹氫箟鐨勬柟娉曞鐞嗚鏁版嵁鍖咃紱鍚﹀垯iptables灏嗙户缁鏌ヤ笅涓€鏉¤鍒欙紝濡傛灉璇ユ暟鎹寘涓嶇鍚堥摼涓换涓€鏉¤鍒欙紝iptables灏变細鏍规嵁璇ラ摼棰勫厛瀹氫箟鐨勯粯璁ょ瓥鐣ユ潵澶勭悊鏁版嵁鍖呫€?/p>

琛紙tables锛夋彁渚涚壒瀹氱殑鍔熻兘锛?span style="">iptables鍐呯疆浜?span style="">4涓〃锛屽嵆filter琛ㄣ€?span style="">nat琛ㄣ€?span style="">mangle琛ㄥ拰raw琛紝鍒嗗埆鐢ㄤ簬瀹炵幇鍖呰繃婊わ紝缃戠粶鍦板潃杞崲銆佸寘閲嶆瀯(淇敼)鍜屾暟鎹窡韪鐞嗐€?/p>

聽聽聽聽聽聽聽浠庡浘2涓彲鐪嬪嚭锛岃〃涓庨摼鐨勫叧绯伙紝raw銆?span style="">mangle銆?span style="">nat鍜?span style="">filter鍥涗釜琛ㄦ墍鍚殑閾炬槸涓嶅悓鐨勶細

raw琛ㄦ湁PREROUTING閾惧拰OUTPUT閾撅紱

mangle琛ㄦ湁PREROUTING閾俱€?span style="">POSTROUTING閾俱€?span style="">INPUT閾俱€?span style="">OUTPUT閾惧拰FORWARD閾撅紱

nat琛ㄦ湁PREROUTING閾俱€?span style="">POSTROUTING閾惧拰OUTPUT閾惧洓涓摼锛?/p>

filter琛ㄦ湁INPUT閾俱€?span style="">FORWARD閾惧拰OUTPUT閾俱€?/p>

iptables [-t table] command [match] [target/jump]

浠ュ浘褰㈢畝鐣ヨ〃绀哄涓嬶紝

鍥?span style="">3 iptables鍛戒护

iptables鍛戒护涓殑command鍙傛暟锛?span style="">match鍙傛暟浠ュ強target/jump鍙傛暟鐨勫叿浣撳惈涔夊彲鍙傝€?span style="">linux涓殑man鎵嬪唽鎴?span style="">iptables鎸囧崡銆?/p>

1.聽聽聽聽聽鍒犻櫎鐜版湁瑙勫垯

iptables -F聽聽聽 鎴栬€吢?iptables --flush

2.聽聽聽聽聽璁剧疆榛樿閾剧瓥鐣?/p>

ptables鐨刦ilter琛ㄤ腑鏈変笁绉嶉摼锛欼NPUT, FORWARD鍜孫UTPUT銆傞粯璁ょ殑閾剧瓥鐣ユ槸ACCEPT锛屽彲浠ュ皢瀹冧滑璁剧疆鎴怐ROP锛屽懡浠ゅ涓嬶細

iptables -P INPUT DROP聽聽聽聽聽聽聽聽聽聽聽聽聽 淇敼INPUT閾剧殑榛樿绛栫暐涓篋ROP

iptables -P FORWARD DROP聽聽聽聽聽聽 淇敼FORWARD閾?/p>

iptables -P OUTPUT DROP聽聽聽聽聽聽聽聽聽聽 淇敼OUTPUT閾?/p>

3.聽聽聽聽聽灞忚斀鎸囧畾鐨?span style="">IP鍦板潃

浠ヤ笅瑙勫垯灏嗗睆钄紹LOCK_THIS_IP鎵€鎸囧畾鐨処P鍦板潃璁块棶鏈湴涓绘満锛?/p>

BLOCK_THIS_IP="x.x.x.x"

iptables -A INPUT -i eth0 -s "$BLOCK_THIS_IP" -j DROP

(鎴栬€呬粎灞忚斀鏉ヨ嚜璇P鐨凾CP鏁版嵁鍖咃級

iptables -A INPUT -i eth0 -p tcp -s "$BLOCK_THIS_IP" -j DROP

4.聽聽聽聽聽灞忚斀鏉ヨ嚜澶栭儴鐨?span style="">ping

iptables -A INPUT -p icmp --icmp-type echo-request -j DROP

iptables -A OUTPUT -p icmp --icmp-type echo-reply -j DROP

5.聽聽聽聽聽灞忚斀浠庢湰鏈?span style="">ping澶栭儴涓绘満

iptables -A OUTPUT -p icmp --icmp-type echo-request -j DROP

iptables -A INPUT -p icmp --icmp-type echo-reply -j DROP

6.聽聽聽聽聽灞忚斀鐜洖(loopback)璁块棶

iptables -A INPUT -i lo -j DROP

iptables -A OUTPUT -o lo -j DROP

7.聽聽聽聽聽鍏佽鎵€鏈?span style="">SSH杩炴帴璇锋眰

鏈鍒欏厑璁告墍鏈夋潵鑷閮ㄧ殑SSH杩炴帴璇锋眰锛屼篃灏辨槸璇达紝鍙厑璁歌繘鍏th0鎺ュ彛锛屽苟涓旂洰鐨勭鍙ｄ负22鐨勬暟鎹寘銆?/p>

iptables -A INPUT -i eth0 -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT

iptables -A OUTPUT -o eth0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT

8.聽聽聽聽聽鍏佽浠庢湰鍦板彂璧风殑SSH杩炴帴

鏈鍒欏厑璁告湰鏈哄彂璧稴SH杩炴帴锛?/p>

iptables -A OUTPUT -o eth0 -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT

iptables -A INPUT -i eth0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT

9.聽聽聽聽聽浠呭厑璁告潵鑷寚瀹氱綉缁滅殑SSH杩炴帴璇锋眰

浠ヤ笅瑙勫垯浠呭厑璁告潵鑷?72.16.132.0/24鐨勭綉缁滐細

iptables -A INPUT -i eth0 -p tcp -s 172.16.132.0/24 --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT

iptables -A OUTPUT -o eth0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT

10.聽聽聽浠呭厑璁镐粠鏈湴鍙戣捣鍒版寚瀹氱綉缁滅殑SSH杩炴帴璇锋眰

浠ヤ笅瑙勫垯浠呭厑璁镐粠鏈湴涓绘満杩炴帴鍒?72.16.1132.0/24鐨勭綉缁滐細

iptables -A OUTPUT -o eth0 -p tcp -d 172.16.132.0/24 --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT

iptables -A INPUT -i eth0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT

11.聽聽聽鍏佽HTTP/HTTPS杩炴帴璇锋眰

# 1.鍏佽HTTP杩炴帴锛?0绔彛

iptables -A INPUT -i eth0 -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT

iptables -A OUTPUT -o eth0 -p tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT

聽

# 2.鍏佽HTTPS杩炴帴锛?43绔彛

iptables -A INPUT -i eth0 -p tcp --dport 443 -m state --state NEW,ESTABLISHED -j ACCEPT

iptables -A OUTPUT -o eth0 -p tcp --sport 443 -m state --state ESTABLISHED -j ACCEPT

12.聽聽聽鍏佽浠庢湰鍦板彂璧?span style="">HTTPS杩炴帴

鏈鍒欏彲浠ュ厑璁哥敤鎴蜂粠鏈湴涓绘満鍙戣捣HTTPS杩炴帴锛屼粠鑰岃闂甀nternet銆?/p>

iptables -A OUTPUT -o eth0 -p tcp --dport 443 -m state --state NEW,ESTABLISHED -j ACCEPT

iptables -A INPUT -i eth0 -p tcp --sport 443 -m state --state ESTABLISHED -j ACCEPT

13.聽聽聽-m multiport锛氭寚瀹氬涓鍙?/p>

閫氳繃鎸囧畾-m multiport閫夐」锛屽彲浠ュ湪涓€鏉¤鍒欎腑鍚屾椂鍏佽SSH銆丠TTP銆丠TTPS杩炴帴锛?/p>

iptables -A INPUT -i eth0 -p tcp -m multiport --dports 22,80,443 -m state --state NEW,ESTABLISHED -j ACCEPT

iptables -A OUTPUT -o eth0 -p tcp -m multiport --sports 22,80,443 -m state --state ESTABLISHED -j ACCEPT

14.聽聽聽鍏佽IMAP涓?span style="">IMAPS

MAP锛?43

iptables -A INPUT -i eth0 -p tcp --dport 143 -m state --state NEW,ESTABLISHED -j ACCEPT

iptables -A OUTPUT -o eth0 -p tcp --sport 143 -m state --state ESTABLISHED -j ACCEPT

聽

# IMAPS锛?93

iptables -A INPUT -i eth0 -p tcp --dport 993 -m state --state NEW,ESTABLISHED -j ACCEPT

iptables -A OUTPUT -o eth0 -p tcp --sport 993 -m state --state ESTABLISHED -j ACCEPT

15.聽聽聽鍏佽POP3涓?span style="">POP3S

# POP3锛?10

iptables -A INPUT -i eth0 -p tcp --dport 110 -m state --state NEW,ESTABLISHED -j ACCEPT

iptables -A OUTPUT -o eth0 -p tcp --sport 110 -m state --state ESTABLISHED -j ACCEPT

聽

# POP3S锛?95

iptables -A INPUT -i eth0 -p tcp --dport 995 -m state --state NEW,ESTABLISHED -j ACCEPT

iptables -A OUTPUT -o eth0 -p tcp --sport 995 -m state --state ESTABLISHED -j ACCEPT

16.聽聽聽闃叉DoS鏀诲嚮

iptables -A INPUT -p tcp --dport 80 -m limit --limit 25/minute --limit-burst 100 -j ACCEPT

-m limit: 鍚敤limit鎵╁睍

鈥搇imit 25/minute: 鍏佽鏈€澶氭瘡鍒嗛挓25涓繛鎺?/p>

鈥搇imit-burst 100: 褰撹揪鍒?00涓繛鎺ュ悗锛屾墠鍚敤涓婅堪25/minute闄愬埗

17.聽聽聽鍏佽璺敱

濡傛灉鏈湴涓绘満鏈変袱鍧楃綉鍗★紝涓€鍧楄繛鎺ュ唴缃?eth0)锛屼竴鍧楄繛鎺ュ缃?eth1)锛岄偅涔堝彲浠ヤ娇鐢ㄤ笅闈㈢殑瑙勫垯灏唀th0鐨勬暟鎹矾鐢卞埌eht1锛?/p>

iptables -A FORWARD -i eth0 -o eth1 -j ACCEPT

18.聽聽聽DNAT涓庣鍙ｈ浆鍙?/p>

浠ヤ笅瑙勫垯灏嗕細鎶婃潵鑷?22绔彛鐨勬祦閲忚浆鍙戝埌22绔彛锛岃繖鎰忓懗鐫€鏉ヨ嚜422绔彛鐨凷SH杩炴帴璇锋眰涓庢潵鑷?2绔彛鐨勮姹傜瓑鏁堛€?/p>

# 1.鍚敤DNAT杞彂

iptables -t nat -A PREROUTING -p tcp -d 172.16.132.17 --dport 422 -j DNAT --to-destination 172.16.132.17:22

聽

# 2.鍏佽杩炴帴鍒?22绔彛鐨勮姹?/p>

iptables -A INPUT -i eth0 -p tcp --dport 422 -m state --state NEW,ESTABLISHED -j ACCEPT

iptables -A OUTPUT -o eth0 -p tcp --sport 422 -m state --state ESTABLISHED -j ACCEPT

聽

鍋囪鐜板湪澶栫綉缃戝叧鏄痻xx.xxx.xxx.xxx锛岄偅涔堟妸HTTP璇锋眰杞彂鍒板唴閮ㄧ殑鏌愪竴鍙拌绠楁満鐨勮鍒欏涓嬶細

iptables -t nat -A PREROUTING -p tcp -i eth0 -d xxx.xxx.xxx.xxx --dport 8888 -j DNAT --to 192.168.0.2:80

iptables -A FORWARD -p tcp -i eth0 -d 192.168.0.2 --dport 80 -j ACCEPT

19.聽聽聽SNAT涓?span style="">MASQUERADE

濡備笅鍛戒护琛ㄧず鎶婃墍鏈?92.168.1.0缃戞鐨勬暟鎹寘SNAT鎴?72.132.16.99鐨刬p鐒跺悗鍙戝嚭鍘伙細

iptables -t nat -A POSTROUTING -s 192.168.1.0/24 -o eth0 -j snat --to-source 172.132.16.99

聽

瀵逛簬snat锛屼笉绠℃槸鍑犱釜鍦板潃锛屽繀椤绘槑纭殑鎸囧畾瑕乻nat鐨処P銆傚亣濡傛垜浠殑璁＄畻鏈轰娇鐢ˋDSL鎷ㄥ彿鏂瑰紡涓婄綉锛岄偅涔堝缃慖P鏄姩鎬佺殑锛岃繖鏃跺€欐垜浠彲浠ヨ€冭檻浣跨敤MASQUERADE

iptables -t nat -A POSTROUTING -s 192.168.1.0/255.255.255.0 -o eth0 -j MASQUERADE

20.聽聽聽鑷畾涔夌殑閾?/p>

璁板綍涓㈠純鐨勬暟鎹寘锛?/p>

# 1.鏂板缓鍚嶄负LOGGING鐨勯摼

iptables -N LOGGING

聽

# 2.灏嗘墍鏈夋潵鑷狪NPUT閾句腑鐨勬暟鎹寘璺宠浆鍒癓OGGING閾句腑

iptables -A INPUT -j LOGGING

聽

# 3.鎸囧畾鑷畾涔夌殑鏃ュ織鍓嶇紑"IPTables Packet Dropped: "

iptables -A LOGGING -m limit --limit 2/min -j LOG --log-prefix "IPTables Packet Dropped: " --log-level 7

聽

# 4.涓㈠純杩欎簺鏁版嵁鍖?/p>

iptables -A LOGGING -j DROP

聽

21.聽聽聽IP鑼冨洿鍖归厤(IP range match options)

婧愶細聽 iptables -A INPUT -p tcp -m iprange --src-range 192.168.1.13-192.168.2.19聽 -j DROP

鐩殑聽 iptables -A INPUT -p tcp -m iprange --dst-range 192.168.1.13-192.168.2.19聽 -j DROP

聽

22.聽聽聽MAC鍖归厤

iptables -A INPUT -m mac --mac-source 00:00:00:00:00:01 -j DROP