王邈说的是对的，应该先查二层连接是否正常，收到大量ARP请求，可能说明楼层一级的接入交换机到网关之间的链路出现问题。 p.s. 跑个题，尽量不要在邮件底部回复，有些折叠不太智能的客户端要找好久…… -- Justin Wong On Thu, Apr 21, 2016, at 14:36, Wang Shanker wrote: > 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][1]>: >>> >>> >>> 这么搞也可以防止 arp 攻击。 >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>>> 在 2016年4月19日，16:10，Justin Wong <[email protected][2]> 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][3]> 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][4] / [email protected][5] >>> >>> >>>>>>>>> >>> >>> >>>>>>>>> >>> >>> >>>>>>>>> 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][6]. >>> >>> >>>>>>>> To post to this group, send email to tuna- >>>>>>>> [email protected][7]. >>> >>> >>>>>>>> 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][8]. >>> >>> >>>>>>> To post to this group, send email to tuna- >>>>>>> [email protected][9]. >>> >>> >>>>>>> For more options, visit 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][10]. >>> >>> >>>>> To post to this group, send email to tuna- >>>>> [email protected][11]. >>> >>> >>>>> 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][12]. >>> >>> >>>> To post to this group, send email to tuna- >>>> [email protected][13]. >>> >>> >>>> 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][14]. >>> >>> >>> To post to this group, send email to [email protected][15]. >>> >>> >>> 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][16]. >>> >>> >>> To post to this group, send email to [email protected][17]. >>> >>> >>> 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][18]. >>> >>> >>> To post to this group, send email to [email protected][19]. >>> >>> >>> 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][20]. >>> >>> >>> To post to this group, send email to [email protected][21]. >>> >>> >>> For more options, visit 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. > > Email had 1 attachment:
> * smime.p7s 6k (application/pkcs7-signature) Links: 1. http://gmail.com/ 2. http://bigeagle.me/ 3. http://gmail.com/ 4. http://foxmail.com/ 5. http://gmail.com/ 6. http://googlegroups.com/ 7. http://googlegroups.com/ 8. http://googlegroups.com/ 9. http://googlegroups.com/ 10. http://googlegroups.com/ 11. http://googlegroups.com/ 12. http://googlegroups.com/ 13. http://googlegroups.com/ 14. http://googlegroups.com/ 15. http://googlegroups.com/ 16. http://googlegroups.com/ 17. http://googlegroups.com/ 18. http://googlegroups.com/ 19. http://googlegroups.com/ 20. http://googlegroups.com/ 21. http://googlegroups.com/ -- --- 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.
