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// Monitoring & logging

Port 6343: sFlow traffic monitoring

Port 6343 is assigned by IANA to sflow (sFlow traffic monitoring).

6343

How sflow works

Monitoring & logging
monitoringdevicesflow monitoringdevicesflow

The monitoring server collects metrics, alerts or logs from devices over port 6343.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Monitoring & logging
01 Security

Is port 6343 dangerous?

We have no specific security note for port 6343. Its risk depends on the program actually listening on it. General advice for monitoring & logging services:

  • Restrict management and monitoring protocols to the monitoring network.
  • Replace community strings and default credentials.
  • Send logs over TLS.
02 Registry

IANA registry entries for port 6343

ServicePortTransportDescriptionReferenceUpdated
sflow 6343 TCP, UDP sFlow traffic monitoring - 2003-06

// source: IANA service name and port number registry

03 Check it

Which program uses port 6343, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6343'      # process listening on 6343
sudo lsof -nP -i :6343

macOS

sudo lsof -nP -i :6343

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6343 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6343
netstat -ano | findstr :6343

From another machine

nmap -p 6343 -sV <host>
sudo nmap -sU -p 6343 <host>
nc -zv <host> 6343

Block it in the firewall

sudo ufw deny 6343/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6343" -Direction Inbound -LocalPort 6343 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6343 used for?

Port 6343 is assigned by IANA to sflow (sFlow traffic monitoring).

Is port 6343 TCP or UDP?

Port 6343 is registered for TCP and UDP.

Is it safe to open port 6343?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Restrict management and monitoring protocols to the monitoring network.

How do I check if port 6343 is open?

On Linux run "ss -ltnup 'sport = :6343'", on macOS "lsof -nP -i :6343", and on Windows "netstat -ano | findstr :6343" to see the local process. From another machine, "nmap -p 6343 <host>" shows whether it is reachable.

05 Related
:161 SNMP udp · tcp · high risk :162 SNMP trap udp · tcp · moderate risk :9090 Prometheus / admin consoles tcp · udp · high risk :514 Syslog udp · tcp · moderate risk :6514 Syslog over TLS tcp · udp · dccp · low risk :5601 Kibana tcp · udp · high risk :391 SynOptics SNMP Relay Port tcp · udp :412 Trap Convention Port tcp · udp

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