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2025-09-14 22:26:17 +00:00

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# 【XJ-NPM现场】功能端sapp间断丢包
| ID | Creation Date | Assignee | Status |
|----|----------------|----------|--------|
| OMPUB-484 | 2022-05-16T10:39:32.000+0800 | 贾依蒙 | 已关闭 |
---
在nezha监控中发现rx_drops_total sapp 间断性丢包。如图1所示。 !图1.png|thumbnail!**yangwei** commented on *2022-05-16T11:39:08.844+0800*:
* 据4月25号交流结果当时报{*}省口移动机房{*}有20台左右功能端存在丢包较多的情况NEZHA监控信息如下
!image-2022-05-16-11-23-25-277.png|width=600,height=262!
monit_stream查看信息如下初步判断为{*}单网卡流量过载(ens1f0网卡上Rx+Drop >1.2Mpps远大于ens2f0上的152K pps){*}
!image-2022-05-16-11-25-54-223.png|width=645,height=210!
* 初步交流确认当时没有新增策略排查因为策略扫描命中率导致丢包的原因进一步查看NEZHA上较长时间范围内sapp丢包曲线如下
* !image-2022-05-16-11-28-07-255.png|width=787,height=362!
* 定位到一台正在丢包现场的功能端执行monit_stream -IHs --per-stream按线程查看sapp处理情况如下
* !image-2022-05-16-11-28-57-505.png|width=667,height=294!
* 进一步判断原因为2号和12号包处理线程流量过载两个线程drop约1.7Mpps包,比其他包处理线程正常处理的包(609K pps)高约3倍
* 通过在丢包功能端对应工作线程捕包发现异常流量基本来自相同二元组疑似DoS
* !image-2022-05-16-11-37-13-225.png|width=901,height=183!
* 小结4月25号丢包的原因基本判定为二元组DoS攻击->单线程分流不匀->功能端工作线程过载建议改为四元组分流可以缓解这种简单的DoS攻击对于DDoS仍然存在问题
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**yangwei** commented on *2022-05-16T11:39:52.170+0800*:
请[~jiayimeng] 补充IDC机房环境出现丢包的详细情况
---
**jiayimeng** commented on *2022-05-16T17:00:10.073+0800*:
新疆联通IDC环境有10台左右的功能端出现间断丢包现象查看monit_device结果显示不丢包查看monit_stream -lHs --per-stream单线程存在分流不均导致的丢包 ,因丢包现象不持续,按线程抓包未能准确在丢包时抓取。
!image-2022-05-16-16-56-18-321.png|thumbnail!
查看sysinfo.log功能端记录的链路质量显示丢包率百分之3多
!screenshot-1.png|thumbnail!
根据省口处理经验修改mrzcpd分流模式为内层四元组分流目前修改了0.14,待观察。
---
**jiayimeng** commented on *2022-05-17T16:17:43.464+0800*:
172.16.0.14修改分流模式后未出现丢包17日中午修改全部TSG-X分流模式为内层四元组。
当前24小时内丢包情况如下。
!image-2022-05-17-16-16-42-319.png|thumbnail!
待明日观察今晚流量高峰期丢包情况。
---
**jiayimeng** commented on *2022-05-18T10:41:50.778+0800*:
今日功能端丢包情况,几乎无丢包。
!image-2022-05-18-10-41-34-224.png|thumbnail!
---
# Attachments
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