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📁 一份很好的linux入门资料
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<HTML><HEAD>  <TITLE>BBS水木清华站∶精华区</TITLE></HEAD><BODY><CENTER><H1>BBS水木清华站∶精华区</H1></CENTER>发信人:&nbsp;omega&nbsp;(leo),&nbsp;信区:&nbsp;Linux&nbsp;<BR>标&nbsp;&nbsp;题:&nbsp;Re:&nbsp;[求助]子网配置:&nbsp;与omega讨论&nbsp;<BR>发信站:&nbsp;BBS&nbsp;水木清华站&nbsp;(Sun&nbsp;Sep&nbsp;21&nbsp;15:18:12&nbsp;1997)&nbsp;<BR>&nbsp;<BR>【&nbsp;在&nbsp;aguest&nbsp;(aguest)&nbsp;的大作中提到:&nbsp;】&nbsp;<BR>∶<I>&nbsp;想和omega兄讨论一下子网问题&nbsp;</I><BR>∶<I>&nbsp;1：如果router的两块网卡的ip,&nbsp;netmask分别设为&nbsp;</I><BR>∶<I>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A:&nbsp;&nbsp;&nbsp;XXX.XXX.XXX.A,&nbsp;255.255.255.0&nbsp;&nbsp;(外部)&nbsp;</I><BR>∶<I>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;b:&nbsp;&nbsp;&nbsp;XXX.XXX.XXX.B,&nbsp;255.255.255.240&nbsp;(内部)&nbsp;</I><BR>∶<I>&nbsp;由于内部的ip的前部分xxx.xxx.xxx与外部的相同，那么由netmask&nbsp;</I><BR>∶<I>&nbsp;判断，内部的ip显然也属于外部网址，如果没有优先级之类的分辨&nbsp;</I><BR>∶<I>&nbsp;方法，显然存在冲突。这种变长子网，在linux上已经实现了吗？&nbsp;</I><BR>∶<I>&nbsp;这样造成的子网冲突如何解决？&nbsp;</I><BR>/sbin/route&nbsp;add&nbsp;-net&nbsp;XXX.XXX.XXX.B&nbsp;netmask&nbsp;255.255.255.240&nbsp;dev&nbsp;eth0&nbsp;or&nbsp;eth1&nbsp;<BR>the&nbsp;problem&nbsp;is&nbsp;with&nbsp;the&nbsp;external&nbsp;part,&nbsp;it&nbsp;is&nbsp;safer&nbsp;to&nbsp;do&nbsp;<BR>/sbin/route&nbsp;add&nbsp;-net&nbsp;XXX.XXX.XXX.0&nbsp;netmask&nbsp;255.255.255.240&nbsp;dev&nbsp;eth1&nbsp;or&nbsp;eth0&nbsp;&nbsp;<BR>/sbin/route&nbsp;add&nbsp;-net&nbsp;XXX.XXX.XXX.16&nbsp;netmask&nbsp;255.255.255.240&nbsp;dev&nbsp;eth1&nbsp;or&nbsp;eth0&nbsp;&nbsp;<BR>and&nbsp;so&nbsp;on&nbsp;<BR>∶<I>&nbsp;2:&nbsp;如果上级router不改变路由表，他就不知道存在子网B,&nbsp;则必然&nbsp;</I><BR>∶<I>&nbsp;arp得不到正确的子网内机器的mac地址。如果proxy&nbsp;arp能使上级&nbsp;</I><BR>∶<I>&nbsp;路由将所有送到子网B的包都送到该router,&nbsp;然后再转给子网内的&nbsp;</I><BR>∶<I>&nbsp;机器。设proxy&nbsp;arp时相关router的设置有什么？&nbsp;</I><BR>∶<I>&nbsp;请omega详细解释一下&nbsp;</I><BR>you&nbsp;can&nbsp;use&nbsp;arp&nbsp;proxy&nbsp;like&nbsp;this&nbsp;<BR>/sbin/arp&nbsp;-s&nbsp;XXX.XXX.XXX.XXX.b&nbsp;&lt;mac&nbsp;addr.&nbsp;of&nbsp;the&nbsp;card&nbsp;in&nbsp;external&nbsp;part&gt;&nbsp;\&nbsp;<BR>netmask&nbsp;255.255.255.240&nbsp;pub&nbsp;<BR>&nbsp;<BR>That&nbsp;is&nbsp;to&nbsp;tell&nbsp;all&nbsp;hosts&nbsp;in&nbsp;the&nbsp;department&nbsp;network&nbsp;that&nbsp;your&nbsp;A&nbsp;card&nbsp;should&nbsp;<BR>answer&nbsp;for&nbsp;subnet&nbsp;B.&nbsp;<BR>&nbsp;<BR>Any&nbsp;the&nbsp;way&nbsp;is&nbsp;to&nbsp;use&nbsp;ip_masquerating,&nbsp;in&nbsp;this&nbsp;case&nbsp;the&nbsp;external&nbsp;network&nbsp;will&nbsp;<BR>not&nbsp;see&nbsp;your&nbsp;subnet,&nbsp;external&nbsp;hosts&nbsp;consider&nbsp;they&nbsp;are&nbsp;talking&nbsp;just&nbsp;with&nbsp;your&nbsp;<BR>subnet&nbsp;router.&nbsp;<BR>&nbsp;<BR>Depends&nbsp;what&nbsp;exactly&nbsp;you&nbsp;want&nbsp;to&nbsp;do,&nbsp;if&nbsp;you&nbsp;want&nbsp;to&nbsp;restrict&nbsp;the&nbsp;access&nbsp;to&nbsp;<BR>external&nbsp;netwaork&nbsp;and&nbsp;protecting&nbsp;your&nbsp;subnet,&nbsp;the&nbsp;ip_masquerating&nbsp;is&nbsp;better.&nbsp;<BR>&nbsp;<BR>If&nbsp;you&nbsp;just&nbsp;want&nbsp;to&nbsp;ensure&nbsp;Inetrnet&nbsp;access&nbsp;to&nbsp;hosts&nbsp;on&nbsp;your&nbsp;subnet,&nbsp;an&nbsp;easier&nbsp;<BR>way&nbsp;is&nbsp;to&nbsp;set&nbsp;your&nbsp;router&nbsp;as&nbsp;a&nbsp;IP&nbsp;bridge,&nbsp;Linux&nbsp;supports&nbsp;is.&nbsp;In&nbsp;this&nbsp;case&nbsp;all&nbsp;<BR>the&nbsp;hosts&nbsp;on&nbsp;your&nbsp;subnet&nbsp;act&nbsp;just&nbsp;as&nbsp;the&nbsp;was&nbsp;directly&nbsp;connected&nbsp;to&nbsp;the&nbsp;&nbsp;<BR>deparment&nbsp;network.&nbsp;<BR>&nbsp;<BR>Good&nbsp;luck!&nbsp;&nbsp;<BR>&nbsp;<BR>--&nbsp;<BR>※&nbsp;来源:·BBS&nbsp;水木清华站&nbsp;bbs.net.tsinghua.edu.cn·[FROM:&nbsp;pics16.cis.PKU.]&nbsp;<BR><CENTER><H1>BBS水木清华站∶精华区</H1></CENTER></BODY></HTML>

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