Debian nic config file

If neither one is supported, you may have to set parameters directly on the kernel driver module. Identify which driver module you're using by reading the output of dmesg and lsmod.

You can use modinfo even on modules that are not loaded, for comparison. ToDo : where does one set kernel module parameters? Next, try to change the settings of the interface while it's operating.

You'll need to be root, of course. Either: ethtool -s eth0 speed duplex full autoneg off assuming Mbps and full duplex mii-tool -F baseTx-FD eth0 same assumption In each case, re-check to see whether the interface settings actually changed, and then try sending some data in and out of the system to see whether the NIC is operating correctly.

However, before you do that, you should understand that some drivers and devices behave differently than others. When the driver module is loaded, the NIC may begin autonegotiation without any way to stop it particularly with drivers that do not accept parameters. The settings from interfaces are applied at some point after that, which may be right in the middle of the negotiation. So, some people find it necessary to delay the ethtool or mii-tool command by a few seconds.

Thus: iface eth0 inet static address Or the analogous mii-tool command. Reboot the machine to make sure it comes up correctly, and be prepared to intervene manually e. Bringing up an interface without an IP address To create a network interface without an IP address at all use the manual method and use pre-up and post-down commands to bring the interface up and down.

You also have to install the vlan package. Just configure the bridge, and the VLAN interface will be created automatically when creating the bridge see below. Defining the DNS Nameservers Before a computer can connect to an external network resource say, for example, a web server , it must have a means of converting any alpha-numeric names e. The Internet uses these structured numeric IP addresses as network addresses.

In the simplest case, that is the file to edit to set the list of name servers. But note that various other programs for dynamic configuration will be happy to overwrite your settings: The resolvconf program The network-manager daemon DHCP clients In most situations, the file to edit is the configuration file for such a program. In the most complex situations, using resolvconf really is the way to go, though in more simple configurations it is probably overkill.

The resolv. Note: Do not confuse this configuration file with the program resolvconf , which unfortunately has a nearly identical name. There will be a line or lines that look like this: nameserver Simply edit the file and enter the IP addresses of the nameservers you need to use after each nameserver.

Add more nameserver lines if you have more nameservers. Don't use this method if you have the resolvconf program installed. See man resolv. The resolvconf program The resolvconf program keeps track of system information about the currently available nameservers. It should not be confused with the configuration file resolv. The resolvconf program is optional on a Debian system.

The configuration file resolv. However, when multiple programs need to dynamically modify the resolv. The resolvconf program addresses this problem. It acts as an intermediary between programs that supply nameserver information e. DEBUG: enable debugging when logging. If the pre-up command fails the network card activation wont take place. Will run the firewall before the network interface gets enabled, if iptables fails to start the network interface wont turn on.

These instructions are optionals are valid for any method, they can be reiterated, alternatively if you want to run script when enabling and disabling network interfaces you can save them inside the directories:. Keep following LinuxHint for additional updates and tips on Linux and Networking.

It makes configuring a network really easy. Network Manager has command line utilities for network configuration. If you have minimal server version of Debian 9 Stretch installed, you may not have Network Manager installed. In that case, you have to install Network Manager. Network Manager has nmtui terminal based interactive tool that you can use to configure networking on Debian 9 Stretch.

You should see the following window. To create a connection, go to Edit a connection. Now select your connection method. I am going for Ethernet as I have a wired connection. Now type in a Profile name.