Linux Network Configuration. Linux TCP/IP Network Configuration Files. File. Description/etc/resolv. List DNS servers for internet domain name resolution. ![]() Ham Radio Software on Centos Linux - Configuring multitudes of Amateur / HAM Radio software for Centos6 / Centos5 Linux. En este artículo voy explicar paso a paso cómo instalar CentOS 7, con en el entorno de escritorio KDE. In this article we will explain how to set up a VPN server using OpenVPN with two remote clients (a Linux box and a Windows machine) on a RHEL/CentOS 7 box. Linux Network Configuration Networking, set-up and administration. This Linux tutorial covers TCP/IP networking, network administration and system configuration basics. Manual page for: /etc/resolv. Lists hosts to be resolved locally (not by DNS). Manual page for: /etc/hosts/etc/nsswitch. List order of host name search. Typically look at local files, then NIS server, then DNS server. Manual page for: /etc/nsswitch. Red Hat/Fedora/Cent. OS: /etc/sysconfig/network. Specify network configuration. Static IP, DHCP, NIS, etc. Red Hat/Fedora/Cent. OS: /etc/sysconfig/network- scripts/ifcfg- device. Specify TCP network information. Ubuntu/Debian: /etc/network/interfaces. Specify network configuration and devices. Static IP and info, DHCP, etc. Domain Resolution Configuration Files. File: /etc/resolv. Name of your domain or ISP's domain if using their name server. XXX. XXX. XXX. XXX - IP address of primary name server. XXX. XXX. XXX. XXX - IP address of secondary name server. This configures Linux so that it knows which DNS server will be resolving. IP addresses. If using DHCP client, this will automatically. ISP and loaded into this file as part of the DHCP protocol. If using a static. IP address, ask the ISP or check another machine on your network. Red Hat/Fedora GUI: /usr/sbin/system- config- network (select tab "DNS"). File: /etc/hosts- locally resolve node names to IP addresses. XXX. XXX. XXX. XXXnode- name. Note when adding hosts to this file, place the fully qualified name. It helps sendmail identify your server correctly) i. XXX. XXX. XXX. XXX superserver. This informs Linux of local systems on the network which are. DNS server. (or for all systems in your LAN if you are not using DNS or NIS). The file format for the hosts file is specified by RFC 9. Red Hat/Fedora configuration GUI: /usr/sbin/system- config- network (select tab "Hosts"). File: /etc/nsswitch. System Databases and Name Service Switch configuration file. This example tells Linux to first resolve a host name by looking at the. DNS server as defined by /etc/resolv. NIS server. In the past this file has had the following names. Fedora / Red Hat Network Configuration Files. Red Hat network configuration file used by the system during the boot process. File: /etc/sysconfig/network- scripts/ifcfg- eth. Configuration settings for your first ethernet port (0). Your. second port is eth. File. /etc/modprobe. Example statement for Intel ethernet card. Modules for other devices on the system will also be listed. This tells the kernel which device driver to use if configured as a. Red Hat). Fedora / Red Hat Network GUI Configuration Tools. The following GUI tools edit the system configuration files. There is no difference in the configuration developed with the GUI tools and. TCP/IP ethernet configuration: Network configuration. FC- 2/3) GUI shown here - -- >. RH 7. 2+ FC- 1). Text console configuration tool. Text User Interface (TUI) for Fedora Core 2/3). RH 9. 0 - FC- 1). Text console network configuration tool. First interface only - eth. GUI) (last available with RH 7. Gnome Desktop: Gnome Desktop Network Configuration. RH 9. 0 - FC- 3). Proxy configuration. Choose one of three options. Direct internet connection. Manual proxy configuration (specify proxy and port). Automatic proxy configuration (give URL). Assigning an IP address. Computers may be assigned a static IP address or assigned one dynamically. Typically a server will require a static IP while a workstation will use DHCP (dynamic IP assignment). The Linux server requires a static IP so that those who wish to use its resources can find the system. It is more easily found if the IP address does not change and is static. This is not important for the Linux client workstation and thus it is easier to use an automated Dynamic Host Configuration Protocol (DHCP) for IP address assignment. Static IP address assignment. Choose one of the following methods. Network address by convention would be the lowest: 1. Broadcast address by convention would be the highest: 1. The gateway can be anything, but following convention: 1. Note: the highest and lowest addresses are based on the netmask. The previous example is based on a netmask of 2. Red Hat / Fedora GUI tools. Gnome GUI network administration tool. Handles all interfaces. Configure for Static IP or DHCP client. First available with Red Hat 7. Handles all interfaces) (last available in Red Hat 7. Red Hat / Fedora Console tools. Text User Interface). Only seems to work for the first network interface eth. Directly edit configuration files/scripts. See format below. The ifconfig command does NOT store this information permanently. Upon reboot this information is lost. Manually add the network configuration to /etc/sysconfig/network- scripts/ifcfg- eth. Red Hat/Fedora/Cent. OS) for the first NIC, ifcfg- eth. Ubuntu) as shown below. Any other commands you may want to add to the system boot sequence can be added to the end of the file /etc/rc. The commands netcfg and netconfig make permanent changes to system network configuration files located in /etc/sysconfig/network- scripts/. The IANA has allocated IP addresses in the range of 1. Command line IP Configuration: ifconfig. TCP/IP, default), inet. IPv. 6), ax. 25 (AMPR Packet Radio), ddp (Appletalk Phase 2), ipx (Novell IPX) or netrom (AMPR Packet radio). Option. Descriptionup. Activate the interface. Implied if IP addresses are specified. Shut down interfacearp. Enable ARP protocol on this interface. Allow ARP to detect the addresses of computer hosts attached to the network.- arp. Disable ARP protocol on this interfacepromisc. Enable promiscuous mode. Receive all packets on the network not just those destined for this interface.- promisc. Disable promiscuous mode. Specify the Maximum Transfer Unit (MTU) of the interface. The MTU is the maximum number of octets the interface is able to handle in a single transaction. Defaults: Ethernet: 1. SLIP: 2. 96broadcast XXX. XXX. XXX. XXXSet the network broadcast address for this interface. XXX. XXX. XXX. XXXSet the IP network mask for this interface. Man page: ifconfig. Ubuntu / Debian IP Configuration Files. File: /etc/network/interfaces. Static IP example. Dynamic IP (DHCP) example. Loopback interface (network within your system without slowing down for the real ethernet based network). First ethernet interface card. First wireless network interface. Also see "man interfaces". Ubuntu GUI Network Tools. Red Hat / Fedora / Cent. OS IP Configuration Files. The Red Hat configuration tools store the configuration information in the file. They will also allow one to configure routing information. File: /etc/sysconfig/network. Static IP address Configuration: (Configure gateway address). HOSTNAME=my- hostname- Hostname is defined here and by command hostname. FORWARD_IPV4=true - True for NAT firewall gateways and linux routers. False for everyone else - desktops and servers. GATEWAY="XXX. XXX. XXX. YYY" - Used if your network is connected to another network or the internet. Static IP configuration. Gateway not defined here for DHCP client. OR for DHCP client configuration. HOSTNAME=my- hostname- Hostname is defined here and by command hostname. Gateway is assigned by DHCP server.). OR for NIS client configuration. HOSTNAME=my- hostname- Hostname is defined here and by command hostname. NISDOMAIN=NISProject. NIS domain to attach. File (Red Hat/Fedora): /etc/sysconfig/network- scripts/ifcfg- eth. S. u. s. e.: /etc/sysconfig/network/ifcfg- eth- id- XX: XX: XX: XX: XX). This file used by the command scripts ifup and ifdown. Static IP address configuration. BOOTPROTO=static. BROADCAST=XXX. XXX. XXX. 2. 55. IPADDR=XXX. XXX. XXX. XXX. NETMASK=2. NETWORK=XXX. XXX. XXX. 0. ONBOOT=yes - Will activate upon system boot. RHEL4/FC3 additions. TYPE=Ethernet. HWADDR=XX: XX: XX: XX: XX: XXGATEWAY=XXX. XXX. XXX. XXX. OR for DHCP client configuration. RHEL4/FC3 additions. IPV6. INIT=no. USERCTL=no. PEERDNS=yes. TYPE=Ethernet. HWADDR=XX: XX: XX: XX: XX: XX. Used by script /etc/sysconfig/network- scripts/ifup to bring the various network interfaces on- line). To disable DHCP change BOOTPROTO=dhcp to BOOTPROTO=none. In order for updated information in any of these files to take effect. Network IP aliasing. Assign more than one IP address to one ethernet card. XXX. XXX. XXX. XXX netmask 2. XXX. XXX. XXX. 2. XXX. XXX. XXX. XXX dev eth. In this example 0 and 1 are aliases in addition to the regular eth. The result of the ifconfig command. Link encap: Ethernet HWaddr 0. C: 2. 5: 7. A: 3. F. inet addr: XXX. XXX. XXX. XXX Bcast: XXX. XXX. XXX. 2. 55 Mask: 2. UP BROADCAST RUNNING MULTICAST MTU: 1. Ham Radio Software on Centos Linux - Configuring multitudes of Amateur / HAM Radio software for Centos. Centos. 5 Linux. http: //www. HAM/Centos. Digital. Modes/hampacketizing- centos. KI6. ZHD. Enabling everything HAM radio on Centos Linux! This document is my journey into Linux- assisted HAM. Centos. This covers many different topics along my personal discovery which started with. AX. 2. 5 packet radio, then into HF digital modes, and most recently SDR and D*star technologies! This. doc will be constantly evolving (mostly focused on Centos. Centos. 5). but here is the index to give you an idea of what it covers today.
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