How to connect to the Internet on CentOS?

CentOS connect to the internet

  • I installed CentOS, but it didn't automatically connect to the internet. Is that the normal behavior? I have Ethernet Broadband Router DI-604 and WebStar DPX2203 series Cablemodem with EMTA . What should I do to connect to the internet? Update: A cousin told me my ethernet adapter or network board will depend on my motherboard. My computer upgrade document says the motherboard is GBabyte video onboard. I heard GBabyte's network adapters are GBabit or Realtek. In CentOS, System -> Administration -> Network -> New -> Ethernet, first, only "Other Network Board" was listed, so I selected it and clicked Next, then there wasn't GBabit, but there was Realtek, so I selected Realtek. I heard with Net Virtua selecting dhcp the things first answered asked me to tell first answerer are automatically configured. So I tried Realtek with dhcp, but eth0 wasn't found. See asterisks: we didn't upgrade that time, the motherboard is Asus. /sbin/lspci -v shows that the Ethernet controller is Atheros L2, subsystem is Asustek. ifconfig output: lo Link encap:Loopback Local inet end.: 127.0.0.1 Masc:255.0.0.0 endereço inet6: ::1/128 Escopo:Máquina UP LOOPBACKRUNNING MTU:16436 Métrica:1 RX packets:2509 errors:0 dropped:0 overruns:0 frame:0 TX packets:2509 errors:0 dropped:0 overruns:0 carrier:0 colisões:0 txqueuelen:0 RX bytes:2650372 (2.5 MiB) TX bytes:2650372 (2.5 MiB) virbr0 Link encap:Ethernet Endereço de HW 00:00:00:00:00:00 inet end.: 192.168.122.1 Bcast:192.168.122.255 Masc:255.255.255.0 endereço inet6: fe80::200:Firefox:fe00:0/64 Escopo:Link UP BROADCASTRUNNING MULTICAST MTU:1500 Métrica:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:43 errors:0 dropped:0 overruns:0 carrier:0 colisões:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:7306 (7.1 KiB) xenbr0 Link encap:Ethernet Endereço de HW 00:00:00:00:00:00 UP BROADCASTRUNNING NOARP MTU:1500 Métrica:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 colisões:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) dhclient output: bash: /sbin/dhclien: Arquivo ou diretório não encontrado [root@localhost deltrem]# /sbin/dhclient Internet Systems Consortium DHCP Client V3.0.5-RedHat Copyright 2004-2006 Internet Systems Consortium. All rights reserved. For info, please visit http://www.isc.org/sw/dhcp/ /sbin/dhclient-script: configuration for xenbr0 not found. Continuing with defaults. /etc/sysconfig/network-scripts/network-functions: line 78: xenbr0: Arquivo ou diretório não encontrado /sbin/dhclient-script: configuration for veth3 not found. Continuing with defaults. /etc/sysconfig/network-scripts/network-functions: line 78: veth3: Arquivo ou diretório não encontrado /sbin/dhclient-script: configuration for vif0.3 not found. Continuing with defaults. /etc/sysconfig/network-scripts/network-functions: line 78: vif0.3: Arquivo ou diretório não encontrado /sbin/dhclient-script: configuration for veth2 not found. Continuing with defaults. /etc/sysconfig/network-scripts/network-functions: line 78: veth2: Arquivo ou diretório não encontrado /sbin/dhclient-script: configuration for vif0.2 not found. Continuing with defaults. /etc/sysconfig/network-scripts/network-functions: line 78: vif0.2: Arquivo ou diretório não encontrado /sbin/dhclient-script: configuration for veth1 not found. Continuing with defaults. /etc/sysconfig/network-scripts/network-functions: line 78: veth1: Arquivo ou diretório não encontrado /sbin/dhclient-script: configuration for vif0.1 not found. Continuing with defaults. /etc/sysconfig/network-scripts/network-functions: line 78: vif0.1: Arquivo ou diretório não encontrado /sbin/dhclient-script: configuration for veth0 not found. Continuing with defaults. /etc/sysconfig/network-scripts/network-functions: line 78: veth0: Arquivo ou diretório não encontrado /sbin/dhclient-script: configuration for vif0.0 not found. Continuing with defaults. /etc/sysconfig/network-scripts/network-functions: line 78: vif0.0: Arquivo ou diretório não encontrado /sbin/dhclient-script: configuration for virbr0 not found. Continuing with defaults. /etc/sysconfig/network-scripts/network-functions: line 78: virbr0: Arquivo ou diretório não encontrado Listening on LPF/xenbr0/00:00:00:00:00:00 Sending on LPF/xenbr0/00:00:00:00:00:00 Listening on LPF/veth3/00:00:00:00:00:00 Sending on LPF/veth3/00:00:00:00:00:00 Listening on LPF/vif0.3/fe:Firefox:Firefox:Firefox:Firefox:Firefox Sending on LPF/vif0.3/fe:Firefox:Firefox:Firefox:Firefox:Firefox Listening on LPF/veth2/00:00:00:00:00:00 Sending on LPF/veth2/00:00:00:00:00:00 Listening on LPF/vif0.2/fe:Firefox:Firefox:Firefox:Firefox:Firefox Sending on LPF/vif0.2/fe:Firefox:Firefox:Firefox:Firefox:Firefox Listening on LPF/veth1/00:00:00:00:00:00 Sending on LPF/veth1/00:00:00:00:00:00 Listening on LPF/vif0.1/fe:Firefox:Firefox:Firefox:Firefox:Firefox Sending on LPF/vif0.1/fe:Firefox:Firefox:Firefox:Firefox:Firefox Listening on LPF/veth0/00:00:00:00:00:00 Sending on LPF/veth0/00:00:00:00:00:00 Listening on LPF/vif0.0/fe:Firefox:Firefox:Firefox:Firefox:Firefox Sending on LPF/vif0.0/fe:Firefox:Firefox:Firefox:Firefox:Firefox Listening on LPF/virbr0/00:00:00:00:00:00 Sending on LPF/virbr0/00:00:00:00:00:00 Sending on Socket/fallback DHCPDISCOVER on xenbr0 to 255.255.255.255 port 67 interval 5 DHCPDISCOVER on veth3 to 255.255.255.255 port 67 interval 8 DHCPDISCOVER on vif0.3 to 255.255.255.255 port 67 interval 8 DHCPDISCOVER on veth2 to 255.255.255.255 port 67 interval 7 DHCPDISCOVER on vif0.2 to 255.255.255.255 port 67 interval 8 DHCPDISCOVER on veth1 to 255.255.255.255 port 67 interval 5 DHCPDISCOVER on vif0.1 to 255.255.255.255 port 67 interval 6 DHCPDISCOVER on veth0 to 255.255.255.255 port 67 interval 3 DHCPDISCOVER on vif0.0 to 255.255.255.255 port 67 interval 6 DHCPDISCOVER on virbr0 to 255.255.255.255 port 67 interval 7 DHCPDISCOVER on veth0 to 255.255.255.255 port 67 interval 6 DHCPDISCOVER on xenbr0 to 255.255.255.255 port 67 interval 13 DHCPDISCOVER on veth1 to 255.255.255.255 port 67 interval 8 DHCPDISCOVER on vif0.1 to 255.255.255.255 port 67 interval 12 DHCPDISCOVER on vif0.0 to 255.255.255.255 port 67 interval 11 DHCPDISCOVER on veth2 to 255.255.255.255 port 67 interval 7 DHCPDISCOVER on virbr0 to 255.255.255.255 port 67 interval 8 DHCPDISCOVER on veth3 to 255.255.255.255 port 67 interval 20 DHCPDISCOVER on vif0.3 to 255.255.255.255 port 67 interval 15 DHCPDISCOVER on vif0.2 to 255.255.255.255 port 67 interval 14 DHCPDISCOVER on veth0 to 255.255.255.255 port 67 interval 11 DHCPDISCOVER on veth1 to 255.255.255.255 port 67 interval 21 DHCPDISCOVER on veth2 to 255.255.255.255 port 67 interval 11 DHCPDISCOVER on virbr0 to 255.255.255.255 port 67 interval 16 DHCPDISCOVER on vif0.0 to 255.255.255.255 port 67 interval 14 DHCPDISCOVER on xenbr0 to 255.255.255.255 port 67 interval 17 DHCPDISCOVER on vif0.1 to 255.255.255.255 port 67 interval 21 DHCPDISCOVER on veth0 to 255.255.255.255 port 67 interval 21 DHCPDISCOVER on vif0.2 to 255.255.255.255 port 67 interval 14 DHCPDISCOVER on vif0.3 to 255.255.255.255 port 67 interval 12 DHCPDISCOVER on veth2 to 255.255.255.255 port 67 interval 19 DHCPDISCOVER on veth3 to 255.255.255.255 port 67 interval 15 DHCPDISCOVER on virbr0 to 255.255.255.255 port 67 interval 13 DHCPDISCOVER on vif0.0 to 255.255.255.255 port 67 interval 14 DHCPDISCOVER on veth1 to 255.255.255.255 port 67 interval 13 DHCPDISCOVER on xenbr0 to 255.255.255.255 port 67 interval 8 DHCPDISCOVER on vif0.3 to 255.255.255.255 port 67 interval 16 DHCPDISCOVER on vif0.2 to 255.255.255.255 port 67 interval 9 DHCPDISCOVER on vif0.1 to 255.255.255.255 port 67 interval 20 DHCPDISCOVER on veth0 to 255.255.255.255 port 67 interval 11 DHCPDISCOVER on veth3 to 255.255.255.255 port 67 interval 10 DHCPDISCOVER on xenbr0 to 255.255.255.255 port 67 interval 13 DHCPDISCOVER on veth2 to 255.255.255.255 port 67 interval 17 DHCPDISCOVER on virbr0 to 255.255.255.255 port 67 interval 17 DHCPDISCOVER on vif0.0 to 255.255.255.255 port 67 interval 16 DHCPDISCOVER on vif0.2 to 255.255.255.255 port 67 interval 14 DHCPDISCOVER on veth1 to 255.255.255.255 port 67 interval 14 DHCPDISCOVER on vif0.3 to 255.255.255.255 port 67 interval 10 DHCPDISCOVER on veth0 to 255.255.255.255 port 67 interval 9 DHCPDISCOVER on veth3 to 255.255.255.255 port 67 interval 8 DHCPDISCOVER on xenbr0 to 255.255.255.255 port 67 interval 5 DHCPDISCOVER on vif0.1 to 255.255.255.255 port 67 interval 2 DHCPDISCOVER on vif0.2 to 255.255.255.255 port 67 interval 2 No DHCPOFFERS received. No working leases in persistent database - sleeping. /sbin/dhclient-script: configuration for veth2 not found. Continuing with defaults. /etc/sysconfig/network-scripts/network-functions: line 78: veth2: Arquivo ou diretório não encontrado Update: Installing Atheros L2. make install says: make -C /lib/modules/2.6.18-194.el5xen/build SUBDIRS=/home/deltrem/l2/src modules make[1]: Entrando no diretório `/usr/src/kernels/2.6.18-194.el5-xen-i686' CC [M] /home/deltrem/l2/src/at_main.o In file included from /home/deltrem/l2/src/at.h:30, from /home/deltrem/l2/src/at_main.c:28: /home/deltrem/l2/src/kcompat.h:1084: error: redefinition of typedef ‘irq_handler_t’ include/Linux/interrupt.h:67: error: previous declaration of ‘irq_handler_t’ was here make[2]: ** [/home/deltrem/l2/src/at_main.o] Erro 1 make[1]: ** [_module_/home/deltrem/l2/src] Erro 2 make[1]: Saindo do diretório `/usr/src/kernels/2.6.18-194.el5-xen-i686' make: ** [default] Erro 2 Take a look here too: http://www.linuxquestions.org/questions/Linux-networking-3/unable-to-activate-eth0-attansic-l2-on-centos-5-1-a-619969/

  • Answer:

    What happens when you try to connect? Are you able to connect to or ping the router? What is the logical IP configuration (the CentOS box's IP address, netmask, broadcast address, route; similar info for the router)? What about the physical hookup? What cables are connected to what ports, and what's the hardware configuration? (E.g., crossover or straight cable? And hooking up a 10BaseT half-duplex card to a GigE only port will not work regardless of the cable.)

Delirium tremens at Super User Visit the source

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