Category Archives: Linux

Linux DHCP server config for PXE/BMP boot

Dell switches support Bare-metal provisioning(BMP) where a switch can be provisioned to automatically download image and config file from a remote server and boot up with that image file. In a nutshell, the process involves:

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VNC-server on Linux

VNC-server settings on Linux Continue reading

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Configuring NIC Teaming in Linux

Link Bonding/NIC Teaming – In some scenarios, to increase the bandwidth we may need to bundle two or more physical interfaces to a single virtual bonding interface on the host. Below steps show how to configure link bonding (also called … Continue reading

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Configuring a Linux Host as NTP Server

  Network devices may need an NTP server to sync its clock; so that all devices in the network display same time…We can configure a Linux host as an NTP server. Check whether NTP daemon is installed in Linux: [Tested … Continue reading

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Tcpdump

tcpdump – to dump the network traffic in Linux platforms. Format: “tcpdump <options> <expressions>” · By default, ‘tcpdump’ will dump traffic on first found lowest numbered interface from the list and continues to dump packets unless a stop signal is … Continue reading

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Ifconfig – Linux

ifconfig– to display interface status in Linux Without any arguments it displays all active interfaces. With “–a” it shows both active and inactive interfaces

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Traceroute

Traceroute – to print the path from local host to destination address. Traceroute can be send UDP probe(by default), TCP SYN or ICMP-Echo with TTL value incremented for each hop. Tracing completes once it receives ICMP “port unreachable” message or … Continue reading

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Ping

Ping/ping6 – to check connectivity to ipv4/ipv6 host. Available options: -b : to ping broadcast IP

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Route

route– to show kernel routing table and to add/delete static route in linux Routing table is saved in /proc/net/route file (for IPv4)

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Netstat

netstat– to display TCP/UDP connections/interface statistics/routing table By default, this command displays all open sockets only. Options: -r: to display routing table -g: to display multicast group -i : to display all network interfaces -s: to display IP, ICMP, TCP, … Continue reading

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