请教如何检查链路问题？我还是觉得链路没有问题，毕竟N个实验室都有相同的问题。。 另外我用XArp确实检测到了大量大量的arp攻击
Justin Wong <[email protected]>于2016年4月21日周四 下午2:53写道： > 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]>: > > > 这么搞也可以防止 arp 攻击。 > > > > > > > > > > > > 在 2016年4月19日，16:10，Justin Wong <[email protected]> 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]> 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] / [email protected] > > > > > > > > > > > > > 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]. > > > > > 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 > > > > > 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]. > > > > > 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. > > > > > > > -- > > > > > > --- > > > 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. > > > > > > > > > > > > > -- > > > > > --- > > > 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. > > > > > 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) > > > > -- > > --- > You received this message because you are subscribed to a topic in the > Google Groups "TUNA 主邮件列表" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/tuna-general/EDgtI-p6rmQ/unsubscribe. > To unsubscribe from this group and all its topics, 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.
