Tag Archives: ip

Renewing DHCP Lease from Ubuntu 24.04 Server

Posted on February 21, 2025 by Ahmed Tawfik

Just found out that Ubuntu 24.04 server doesn’t use dhclient anymore and uses dhcpcd instead for obtaining dhcp address leases. To renew your dhcp address, do the following: That’s it, Enjoy! Sources: https://askubuntu.com/questions/1511816/how-to-renew-ip-address-with-ubuntu-24-04

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How to use the ip command to bring up/down the network interface on Linux

Posted on January 21, 2018 by Ahmed Tawfik

The ip command is replacing ifconfig, which is getting deprecated and some distros have already removed it. To bring a network interface down, simply run the following: sudo ip link set enp0s25 down To bring it back up: sudo ip … Continue reading →

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Fix Slow SFTP/SCP File Upload Rate and Stalling caused by TCP SACK

Posted on July 26, 2017 by Ahmed Tawfik

In brief, sometimes a conflict occurs between some firewalls and the TCP SACK. In my case, the upload was severely affected and reached upload speeds of a few kilobytes over a LAN! The following command disables TCP SACK and fixes … Continue reading →

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How to configure network settings in CentOS (from dhcp to static)

Posted on October 25, 2014 by Ahmed Tawfik

It’s a bit different from what we’re used to do in Ubuntu, here are the instructions, assuming our network interface is eth0: Take a backup from the “/etc/sysconfig/network-scripts/ifcfg-eth0” file, e.g. by the following command: “cp /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-eth0.bak” Open the “/etc/sysconfig/network-scripts/ifcfg-eth0” file for … Continue reading →

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