Category Archives: Uncategorized

#tail -f /var/log/messages-2014-10-23 (to see which directory it is read as e.g. /dev/sdb1 , once plugged in) #cat /proc/partitions (to see which /dev/ directory it is plugged into) or #fdisk -l #mkdir /tmp/usb (create a mount point) #mount /dev/sdb1 /tmp/usb #cp /var/archive/backup123. /tmp/usb #unmount /tmp/usb

#vmstat (summary information for system load and usage, but does not show individual processes) #ps aux (display all processes running on the Linux system)(to search for specific processes or list them all) #ps aux | grep auth (all the processes that have auth in them) #ps auxf | sort -nr -k 4 | head -10Continue reading “System information commands”

#uptime or #watch -n 1 uptime

iftop -i ethF iftop -i ethF -f “dst host Linux.com” iftop -i ethF -f “dst host 8.8.8.8”

To see the number of concurrent DNS requests at a time through the Smoothwall: netstat -anp | grep dnsmasq | wc -l To see the number of sessions open through the external connection: netstat -an | wc -l To see the process ID ofthe windows process using netstat: netstat -a -n -o

ip link show ethX ip link set dev ethX down ip link set dev ethX address XX:XX:XX:XX:XX:XX ip link set dev ethX up

Install iperf client on windows from: https://iperf.fr/ or Ubuntu using: sudo apt-get install iperf Try the following from the client machines inside the network and/or from the Smoothwall: (using speedtest sites through the Smoothwall are not recommended) iperf -c iperf.securityinspection.com iperf -c iperf.saratov.ertelecom.ru iperf -c st2.nn.ertelecom.ru iperf -c iperf.ips.versatel.de iperf -c iperf.testdebit.info iperf -c iperf.cds.comContinue reading “Speed test (speedtest) / slow speed issue”

watch -n 1 /sbin/ifconfig ethC To check the latest NIC drivers in the database for the Smoothwall’s linux kernel #lspci -nnn (to check the ethernet controllers and the hardware detected by smoothwall)(To check the company ID and the unique hardware ID i.e. PCI-ID) (to check the ethernet controllers and the hardware detected by smoothwall) orContinue reading “To see live traffic on an interface especially external interface (updates every second)”

#ip link set ethX up #ip link set ethX down

Script to run top command after every 5 minutes CPU utilization: #!/bin/sh top -b -n 1 | head -17 >> /var/log/logging.txt echo “=========” >> /var/log/logging.txt To show CPU and process information (press q to quit): #top (resource usage and running processes) (uptime and the load average) (CPU usage: us for users, sy for system andContinue reading “CPU usage Linux scripts and commands”