Network traffic: Difference between revisions

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|status=Draft
|owner=Knowledge Agent
|last_update=2026-07-16
|review=Pending
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== Overview ==
== Overview ==


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* 왜 필요한가? - HPC 및 서버 환경에서 필수 개념
* 왜 필요한가? - HPC 및 서버 환경에서 필수 개념
* 언제 사용하는가? - 서버 구성, 성능 튜닝, 문제 해결 시
* 언제 사용하는가? - 서버 구성, 성능 튜닝, 문제 해결 시


== Purpose ==
== Purpose ==
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* Scope: Network traffic의 개념, 사용법, 설정
* Scope: Network traffic의 개념, 사용법, 설정
* Non-goals: 다른 주제로의 확장
* Non-goals: 다른 주제로의 확장


== Key Concepts ==
== Key Concepts ==
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| [[Linux]], [[Server]]
| [[Linux]], [[Server]]
|}
|}


== Detailed Explanation ==
== Detailed Explanation ==
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* [https://github.com/raboof/nethogs#readme nethogs] monitors traffic going to/from a machine, per process
* [https://github.com/raboof/nethogs#readme nethogs] monitors traffic going to/from a machine, per process
* nettop shows packet types, sorts by either size or number of packets.
* nettop shows packet types, sorts by either size or number of packets.


== Best Practices ==
== Best Practices ==
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* 공식 문서 참고
* 공식 문서 참고
* 테스트 환경에서 먼저 검증
* 테스트 환경에서 먼저 검증


== References ==
== References ==


* [https://wiki.hpcmate.com Network traffic]
* [https://wiki.hpcmate.com Network traffic]


== Related Pages ==
== Related Pages ==
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* [[Hardware]]
* [[Hardware]]
* [[Network]]
* [[Network]]


[[Category:Network]]
[[Category:Network]]

Latest revision as of 13:25, 2 October 2026

Overview

Network traffic에 대한 기술 문서입니다.

Summary

  • 무엇인가? - Network traffic
  • 왜 필요한가? - HPC 및 서버 환경에서 필수 개념
  • 언제 사용하는가? - 서버 구성, 성능 튜닝, 문제 해결 시

Purpose

이 문서가 존재하는 이유

  • Goal: Network traffic에 대한 기술 정보 제공
  • Scope: Network traffic의 개념, 사용법, 설정
  • Non-goals: 다른 주제로의 확장

Key Concepts

Concept Description Related
Network traffic HPC/서버 환경에서 중요한 기술 개념 Linux, Server

Detailed Explanation

In freebsd, session table provides real time rx/tx information for each connection. In Linux netfilter router, connections table only includes information on end of connections by default. from Linux kernel version >= 2.6.18, we can use conntract or conntrackd daemon[1], This tool can be used to search, list, inspect and maintain the connection tracking subsystem of the Linux kernel.

Conntrack points in Netfilter[2]

conntrack module traces the connection status of trackable protocols (specific protocols, not all.) Set nf_contrack_acct $ sysctl -w net.netfilter.nf_conntrack_acct=1[3] Install contrack utility, if you do not have yet $sudo apt-get install conntrack # conntrack -L #conntrack -L -p tcp --dport 22 #conntrack -U -p tcp --dport 22 --mark 10 it can also block TCP traffic when

  • stateful rule-set that drops traffic in INVALID state
  • /proc/sys/net/netfilter/nf_conntrack_tcp_loose to zero.
  • # conntrack -D -p tcp --dport 22

#conntrack -E There are bunch of network monitoring tools are available and this discussion shows most of them

  • nethogs monitors traffic going to/from a machine, per process
  • nettop shows packet types, sorts by either size or number of packets.

Best Practices

  • 최신 버전 사용 권장
  • 공식 문서 참고
  • 테스트 환경에서 먼저 검증

References

Related Pages

Knowledge Graph

Related

→ Network performance test → RDMA → NIC Bonding → Network → IPMI → SDN → NFS