{"id":19374,"date":"2017-01-13T06:32:22","date_gmt":"2017-01-12T22:32:22","guid":{"rendered":"https:\/\/2blog.ilc.edu.tw\/25793\/2017\/01\/13\/ubuntu-server-ufw-firewall-1\/"},"modified":"2021-03-18T17:24:53","modified_gmt":"2021-03-18T09:24:53","slug":"ubuntu-server-ufw-firewall-1","status":"publish","type":"post","link":"https:\/\/2blog.ilc.edu.tw\/25793\/2017\/01\/13\/ubuntu-server-ufw-firewall-1\/","title":{"rendered":"Ubuntu Server ufw Firewall – 1"},"content":{"rendered":"

\u7528\u6307\u4ee4\u5f0f\u7684 ufw \u4f3c\u4e4e\u5f88\u96e3\u80fd\u8655\u7406 NAT \u6216\u5176\u5b83\u6bd4\u8f03\u9032\u968e\u7684\u9632\u706b\u7246\u8a2d\u5b9a\u3002
\u53c3\u8003\u7db2\u9801\uff1a
NAT and FORWARD with Ubuntu\u2019s ufw firewall \u00b7 GitHub<\/a> <\/p>\n

1. \u4fee\u6539 \/etc\/default\/ufw<\/span> \u8a2d\u5b9a\u6a94\u4e2d\u95dc\u65bc FORWARD POLICY \u4e2d\u7684\u8a2d\u5b9a
# cp \/etc\/default\/ufw \/etc\/default\/ufw.$(date +%F)<\/span>
# sed -i ‘s\/DEFAULT_FORWARD_POLICY=”DROP”\/DEFAULT_FORWARD_POLICY=”ACCEPT”\/’ \/etc\/default\/ufw<\/span> <\/p>\n

2. \u4fee\u6539 \/etc\/ufw\/sysctl.conf<\/span> \u8a2d\u5b9a\u6a94
# cp \/etc\/ufw\/sysctl.conf \/etc\/ufw\/sysctl.conf.$(date +%F)<\/span>
# sed -i ‘s|#net\/ipv4\/ip_forward=1|net\/ipv4\/ip_forward=1|’ \/etc\/ufw\/sysctl.conf<\/span>[@more@]
\u5728 ufw \u7684\u6240\u6709\u898f\u5247\u4e4b\u524d\u751f\u6548
\/etc\/ufw\/before.rules<\/span>
\u5728 ufw \u7684\u6240\u6709\u898f\u5247\u4e4b\u5f8c\u751f\u6548
\/etc\/ufw\/after.rules<\/span> <\/p>\n

3. \u4fee\u6539 \/etc\/ufw\/before.rules<\/span> \u8a2d\u5b9a\u6a94
# cp \/etc\/ufw\/before.rules \/etc\/ufw\/before.rules.$(date +%F)<\/span>
# echo -e “n# NAT table rulesn*natn:PREROUTING ACCEPT [0:0]n:POSTROUTING ACCEPT [0:0]nn# Port Forwardingsn-A PREROUTING -i eth0 -p tcp –dport 22 -j DNAT –to-destination 192.168.1.10nn# Forward traffic through eth0 – Change to match you out-interfacen-A POSTROUTING -s 192.168.1.0\/24 -o eth0 -j MASQUERADEnn# don’t delete the ‘COMMIT’ line or these nat table rules won’t be processednCOMMIT” >> \/etc\/ufw\/before.rules<\/span> <\/p>\n

4. \u91cd\u65b0\u8f09\u5165\u9632\u706b\u7246\u898f\u5247
# ufw reload<\/span> <\/p>\n

5. \u6aa2\u67e5\u662f\u5426\u6709\u6b63\u78ba\u8a2d\u5b9a
# iptables -t nat -L -n<\/span>
Chain PREROUTING (policy ACCEPT)<\/span>
target\u00a0\u00a0\u00a0\u00a0 prot opt source\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 destination<\/span>
DNAT\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 tcp\u00a0 —\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 tcp dpt:22 to:192.168.1.10<\/span> <\/p>\n

Chain INPUT (policy ACCEPT)<\/span>
target\u00a0\u00a0\u00a0\u00a0 prot opt source\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 destination<\/span> <\/p>\n

Chain OUTPUT (policy ACCEPT)<\/span>
target\u00a0\u00a0\u00a0\u00a0 prot opt source\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 destination<\/span> <\/p>\n

Chain POSTROUTING (policy ACCEPT)<\/span>
target\u00a0\u00a0\u00a0\u00a0 prot opt source\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 destination<\/span>
MASQUERADE\u00a0 all\u00a0 —\u00a0 192.168.1.0\/24\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0<\/span><\/p>\n

\u9019\u88e1\u8981\u7279\u5225\u6ce8\u610f\u7684\u662f\uff0c\u624b\u52d5\u6dfb\u52a0 NAT \u90e8\u5206\u7684\u9632\u706b\u7246\u898f\u5247\uff0c\u5728\u91cd\u65b0\u555f\u52d5 ufw \u6642\u4e26\u4e0d\u6703\u81ea\u52d5\u6e05\u9664\uff0c\u5982\u679c\u91cd\u8907\u57f7\u884c ufw\uff0c\u5247\u540c\u6a23\u7684\u898f\u5247\u6703\u518d\u6dfb\u52a0\u4e00\u6b21\uff0c\u6240\u4ee5\u8981\u624b\u52d5\u81ea\u884c\u6e05\u9664\u3002
# iptables -t nat -F<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

\u7528\u6307\u4ee4\u5f0f\u7684 ufw \u4f3c\u4e4e\u5f88\u96e3\u80fd\u8655\u7406 NAT \u6216\u5176\u5b83\u6bd4\u8f03\u9032\u968e\u7684\u9632\u706b\u7246\u8a2d\u5b9a\u3002 \u53c3\u8003\u7db2\u9801\uff1a NAT and FORW … <\/p>\n

\u95b1\u8b80\u5168\u6587\u3008Ubuntu Server ufw Firewall – 1\u3009<\/span><\/a><\/p>\n","protected":false},"author":55,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[119],"tags":[],"class_list":["post-19374","post","type-post","status-publish","format-standard","hentry","category-c-78464"],"meta_key":{"_pingme":["1"],"_encloseme":["1"],"lt_post_id":["680662"]},"_links":{"self":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts\/19374"}],"collection":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/users\/55"}],"replies":[{"embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/comments?post=19374"}],"version-history":[{"count":1,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts\/19374\/revisions"}],"predecessor-version":[{"id":20915,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts\/19374\/revisions\/20915"}],"wp:attachment":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/media?parent=19374"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/categories?post=19374"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/tags?post=19374"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}