问网关 mac 的 ARP 的包很多，这个现象并不必然说明问题是私设 IP 造成的。
私设 IP，只要这个人私设的 IP 不是网关的 IP，顶多就是冲突掉另一个用户，不会造成大规模的用户故障。 询问网关的 ARP 包多，恰恰说明大面积用户经常出现与网关连通出现故障的问题（正是因为连不上了，所以才去用 ARP 问）。所以要调查你们的交换机和网关的连通性的问题，先从物理线路查起。 本邮件具有数字签名，敬请核对。 王邈 清华大学计算机科学与技术系 电话：+86 130-5186-7712 通信地址：北京市海淀区清华大学紫荆公寓2号楼307A 100084 Please verify the digital signature attached with the e-mail. Miao Wang Department of Computer Science and Technology, Tsinghua University Tel.: +86 130-5186-7712 Add.: Room 307A, No.2 Zijing Building, Tsinghua University, Peking. P.R.C. 100084 > 在 2016年4月21日，14:30，杨海宇 <[email protected]> 写道： > > 在 2016年4月20日星期三 UTC+8下午2:03:55，Justin Wong写道： >> 话不能这么说，大家都是学生。TUNA 这么多项目，也没赚过一分钱，都是技术兴趣。 >> >> >> >> >> 如果真要按报酬来，业界标准￥100-200/hr，可能我们两小时解决了，也就几百块钱。 >> >> >> >> >> 跑题了，敢问楼主的问题解决的怎样？ >> >> >> >> >> >> -- >> >> >> Justin Wong >> >> >> >> >> On Wed, Apr 20, 2016, at 13:34, Xin Yue wrote: >> >> >> >> >> 说句良心话，华三都搞不定的问题，巨巨给你解决了，才只是帮助争取一下勤工助学的报酬。。。 >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> -- >> >> >> "Across the Great Wall we can reach every corner in the world" >> >> >> >> >> >> >> >> >> >> >> >> >> >> 在 2016年4月20日 下午1:25，Justin Wong <[email protected]>写道： >> >> >> >> >> >> >> 抓住个滥用ARP的现行 >> >> >> >> >> >> >> -- >> >> >> Justin Wong >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> On Wed, Apr 20, 2016, at 13:24, Sam Stoelinga wrote: >> >> >> >> 你可以试试分配IP后，保证IP不会被别人抢了，通过不停的发ARP broadcast。 >> >> >> >> >> >> arping -I enp0s25 -U -b 166.111.144.152 >> >> >> >> >> >> 166.111.144.152 should be IP that the dhcp server gave you. >> >> >> >> >> >> >> >> >> 2016-04-19 16:11 GMT+08:00 Wang Shanker <[email protected] >> <http://gmail.com/>>: >> >> >> 这么搞也可以防止 arp 攻击。 >> >> >> >> >> >> >> >> >> >> >>> 在 2016年4月19日，16:10，Justin Wong <[email protected] <http://bigeagle.me/>> 写道： >> >> >>> >> >> >>> 打开DHCP snooping可以禁止手动设置IP，ARP攻击怎么防我还真不知道 >> >> >>> >> >> >>> -- >> >> >>> Justin Wong >> >> >>> >> >> >>> On Tue, Apr 19, 2016, at 16:09, 杨海宇 wrote: >> >> >>>> 在 2016年4月19日星期二 UTC+8下午4:03:26，Justin Wong写道： >> >> >>>>> 难道说因为 IP 不够分引起了一些人不爽所以发起 ARP 攻击抢 IP？ >> >> >>>>> >> >> >>>>> -- >> >> >>>>> Justin Wong >> >> >>>>> >> >> >>>>> On Tue, Apr 19, 2016, at 16:01, Wang Shanker wrote: >> >> >>>>>> 不会，如果 ip 分光了， dhcp 服务器会拒绝继续分配 ip 地址，不会出现时断时续的问题。 >> >> >>>>>> >> >> >>>>>> 发自我的 iPhone >> >> >>>>>> >> >> >>>>>>> 在 2016年4月19日，15:59，杨海宇 <[email protected] <http://gmail.com/>> 写道： >> >> >>>>>>> >> >> >>>>>>> 有同学觉得是ip地址不够分配了，毕竟我们整个系只有/24一个段。可是如果是ip不够用会是这个现象吗？ >> >> >>>>>>> >> >> >>>>>>> >> >> >>>>>>> 在 2016年4月19日星期二 UTC+8下午2:06:19，杨海宇写道： >> >> >>>>>>>> 各位巨巨好， >> >> >>>>>>>> 我是热能系的硕士，潜水N年。现在李兆基大楼网络有很多问题，到网关和同网段ip丢包严重，平均60％。经常性出现ip冲突。因为负责网络的人非常不靠谱，只好找金枪鱼求助，恳请有时间的巨巨来指导一下。 >> >> >>>>>>>> 李兆基大楼现在是机械学院很多系的系馆，包括热能系汽车系训练中心。目前环境是光纤到实验室，实验室自己配置交换机。不同系在不同vlan下面，热能系ip段101.6.62.1/24，汽车系166.111.144.1/24（不确定）。行政上，网络由华三提供的解决方案，出问题应该由大楼物业负责，然而物业的网管师傅水平很渣，只会检查网线和光纤通不通。华三的人也来过，但没有查出什么问题。现在的问题是到网关和同网段ip丢包严重（mtr结果在后面），热能系、汽车系不同实验室都存在相同的问题，应该能排除自己交换机的问题。不知道如果是可供使用的ip不够，是否会出现这个问题？ >> >> >>>>>>>> 实验室老板让我看看怎么搞，我说另请高明吧，我实在也不是谦虚。老板说系里决定了，由你负责解决。我当时并没有念诗，所以只好求助网管会的各位巨巨。需要巨巨们到现场看一下环境，排查一下问题。如果需要的话，我会和老板争取一下报酬，通过勤工助学的方式给巨巨一些补贴。 >> >> >>>>>>>> 如果哪位巨巨有时间有兴趣，请联系我：15210582389，微信：yang_hai_yu，email: >> >> >>>>>>>> [email protected] <http://foxmail.com/> / [email protected] >>>>>>>> <http://gmail.com/> >> >> >>>>>>>> >> >> >>>>>>>> >> >> >>>>>>>> 一些结果： >> >> >>>>>>> >> >> >>>>>>> -- >> >> >>>>>>> >> >> >>>>>>> --- >> >> >>>>>>> You received this message because you are subscribed to the Google >>>>>>> Groups "TUNA 主邮件列表" group. >> >> >>>>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>>>> an email to [email protected] <http://googlegroups.com/>. >> >> >>>>>>> To post to this group, send email to [email protected] >>>>>>> <http://googlegroups.com/>. >> >> >>>>>>> For more options, visit https://groups.google.com/d/optout >>>>>>> <https://groups.google.com/d/optout>. >> >> >>>>>> >> >> >>>>>> -- >> >> >>>>>> >> >> >>>>>> --- >> >> >>>>>> You received this message because you are subscribed to the Google Groups >> >> >>>>>> "TUNA 主邮件列表" group. >> >> >>>>>> To unsubscribe from this group and stop receiving emails from it, send an >> >> >>>>>> email to [email protected] <http://googlegroups.com/>. >> >> >>>>>> To post to this group, send email to [email protected] >>>>>> <http://googlegroups.com/>. >> >> >>>>>> For more options, visit https://groups.google.com/d/optout >>>>>> <https://groups.google.com/d/optout>. >> >> >>>>>> Email had 1 attachment: >> >> >>>>>> + smime.p7s >> >> >>>>>> 3k (application/pkcs7-signature) >> >> >>>> >> >> >>>> 我明天去检查一下arp。 >> >> >>>> 另外，只打开dhcp snooping可以防止arp攻击吗，可以禁止手动设置ip吗？ >> >> >>>> >> >> >>>> -- >> >> >>>> >> >> >>>> --- >> >> >>>> You received this message because you are subscribed to the Google Groups >> >> >>>> "TUNA 主邮件列表" group. >> >> >>>> To unsubscribe from this group and stop receiving emails from it, send an >> >> >>>> email to [email protected] <http://googlegroups.com/>. >> >> >>>> To post to this group, send email to [email protected] >>>> <http://googlegroups.com/>. >> >> >>>> For more options, visit https://groups.google.com/d/optout >>>> <https://groups.google.com/d/optout>. >> >> >>> >> >> >>> -- >> >> >>> >> >> >>> --- >> >> >>> You received this message because you are subscribed to the Google Groups >>> "TUNA 主邮件列表" group. >> >> >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to [email protected] <http://googlegroups.com/>. >> >> >>> To post to this group, send email to [email protected] >>> <http://googlegroups.com/>. >> >> >>> For more options, visit https://groups.google.com/d/optout >>> <https://groups.google.com/d/optout>. >> >> >> >> >> >> -- >> >> >> >> >> >> --- >> >> >> You received this message because you are subscribed to the Google Groups >> "TUNA 主邮件列表" group. >> >> >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <http://googlegroups.com/>. >> >> >> To post to this group, send email to [email protected] >> <http://googlegroups.com/>. >> >> >> For more options, visit https://groups.google.com/d/optout >> <https://groups.google.com/d/optout>. >> >> >> >> >> >> >> >> >> >> >> >> -- >> >> >> >> >> >> --- >> >> >> You received this message because you are subscribed to the Google Groups >> "TUNA 主邮件列表" group. >> >> >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <http://googlegroups.com/>. >> >> >> To post to this group, send email to [email protected] >> <http://googlegroups.com/>. >> >> >> For more options, visit https://groups.google.com/d/optout >> <https://groups.google.com/d/optout>. >> >> >> >> >> >> >> >> >> >> >> >> >> -- >> >> >> >> >> --- >> >> >> You received this message because you are subscribed to the Google Groups >> "TUNA 主邮件列表" group. >> >> >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <http://googlegroups.com/>. >> >> >> To post to this group, send email to [email protected] >> <http://googlegroups.com/>. >> >> >> For more options, visit https://groups.google.com/d/optout >> <https://groups.google.com/d/optout>. >> >> >> >> >> >> >> >> >> >> >> -- >> >> >> >> >> --- >> >> >> You received this message because you are subscribed to the Google Groups >> "TUNA 主邮件列表" group. >> >> >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <http://googlegroups.com/>. >> >> >> To post to this group, send email to [email protected] >> <http://googlegroups.com/>. >> >> >> For more options, visit https://groups.google.com/d/optout >> <https://groups.google.com/d/optout>. >> >> >> > 确实有非常多到网关的arp请求。而且还看到了duplicate use of xxx. > > 我们系自己的学生网管建议过别的学生和老师如果dhcp分不到ip，就自己手动设置一个。。。所以现在肯定有一些人的ip是自己设置的静态ip，不是从dhcp那里拿到的。会不会与问题有关？ > 自己试了一下，给自己设置一个静态ip是可以用的，但是我要求华三的人在所有楼层交换机上打开dhcp > snooping了（可能并不是华三的人，只是个代理商或者只是给大楼建网络的公司的人）。 > 上次的问题是有人把路由器接反了，导致很多人分到了192.168.0.1/24的私有ip，打开了dhcp > snooping之后没再出现这种问题。难道是华三的这个功能我理解错了？或者干脆就没有打开？ > 华三某配置指南上有写： > >> 为防止非法用户通过配置静态 IP 地址的方式接入网络,在用户所在 VLAN 内启用 ARP Detection > 功能(本例为缺省 VLAN 1 内),基于 DHCP Snooping 表项对用户进行合法性检查,保证合法用户可以正常转发报文 > > dhcp snooping和ARP Detection是什么关系？ > > PS：话说为什么回复不能加附件了。。。粘贴了一些抓包的结果 > > 7451 76.294550000 Giga-Byt_44:29:8f Broadcast ARP 60 > Who has 101.6.62.1? Tell 101.6.62.195 (duplicate use of 101.6.62.195 > detected!) > 7453 76.332446000 Micro-St_b4:a0:85 Broadcast ARP 60 > Who has 101.6.62.1? Tell 101.6.62.233 > 7454 76.334221000 SuperMic_6c:a8:1b Broadcast ARP 60 > Who has 101.6.62.1? Tell 101.6.62.91 > 7458 76.351186000 Tp-LinkT_e8:79:f4 Broadcast ARP 60 > Who has 192.168.1.105? Tell 192.168.1.1 (duplicate use of 192.168.1.1 > detected!) > 7466 76.377746000 WistronI_b3:79:99 Broadcast ARP 60 > Who has 101.6.62.1? Tell 101.6.62.176 > 7475 76.576748000 Dell_ae:c3:97 Broadcast ARP 60 Who has > 101.6.62.1? Tell 101.6.62.62 > 7482 76.676673000 HewlettP_5a:54:b7 Broadcast ARP 60 > Who has 101.6.62.145? Tell 101.6.62.148 > > -- > > --- > You received this message because you are subscribed to the Google Groups > "TUNA 主邮件列表" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > For more options, visit https://groups.google.com/d/optout. -- --- You received this message because you are subscribed to the Google Groups "TUNA 主邮件列表" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. For more options, visit https://groups.google.com/d/optout.
smime.p7s
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