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eth0 up but ifcfg-eth0 missing

Discussion in 'General Discussion' started by carock, May 22, 2018.

  1. carock

    carock Well-Known Member

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    I feel like an idiot, but I can't figure this one out.

    My server has a nice static IP on eth0. Comes up every time I boot.

    It also has a few alias IP's added through WHM.

    I noticed the netmask was wrong on its main original IP.

    I was going to edit the ifcfg-eth0 file to fix it, but this file doesn't exist. ifcfg-eth1 exists, but not one for eth0.

    Where does the eth0 interface configuration come from?

    It's CentOS 7 VM on Xen. WHM 70

    The only other configuration files I have found reside in /root/network but that ifcfg-eth0 file has the correct mask/prefix so I don't think that is it.

    Any ideas?

    Thanks,
    Chuck
     
  2. 24x7server

    24x7server Well-Known Member

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    Hi,

    You will have to check what ethernet actually system has made an entry of. Use the below command to check what ethernet device is named by the system:

    # ip addr show
    Check if it is eth, ens or any other.
     
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  3. carock

    carock Well-Known Member

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    It also says eth0, notice it's a /24 and the additional IP's are the correct /29

    #ip addr show
    1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
    valid_lft forever preferred_lft forever
    2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 5a:37:82:63:6e:12 brd ff:ff:ff:ff:ff:ff
    inet 68.90.69.102/24 brd 68.90.69.255 scope global noprefixroute eth0
    valid_lft forever preferred_lft forever
    inet 68.90.69.108/29 brd 68.90.69.111 scope global eth0:cp1
    valid_lft forever preferred_lft forever
    inet 68.90.69.98/29 brd 68.90.69.103 scope global eth0:cp3
    valid_lft forever preferred_lft forever
    inet 68.90.69.107/29 brd 68.90.69.111 scope global secondary eth0:cp2
    valid_lft forever preferred_lft forever
    inet 68.90.69.101/29 brd 68.90.69.103 scope global secondary eth0:cp4
    valid_lft forever preferred_lft forever
    inet6 fe80::5837:82ff:fe63:6e12/64 scope link
    valid_lft forever preferred_lft forever
    3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 96:25:1e:80:9a:b5 brd ff:ff:ff:ff:ff:ff
    ..
    ...


    Directory list of /etc/sysconfig/network-scripts/

    drwxr-xr-x. 2 root root 4096 May 19 00:19 ./
    drwxr-xr-x. 6 root root 4096 May 19 00:19 ../
    -rw------- 1 root root 335 Oct 21 2017 ifcfg-eth1
    -rw------- 1 root root 272 Apr 4 15:49 ifcfg-eth1:0
    -rw-r--r-- 1 root root 254 Jan 2 10:29 ifcfg-lo
    -rw-r--r-- 1 root root 421 Oct 21 2017 ifcfg-Wired_connection_1
    lrwxrwxrwx 1 root root 24 May 11 00:21 ifdown -> ../../../usr/sbin/ifdown*
    -rwxr-xr-x 1 root root 654 Jan 2 10:29 ifdown-bnep*
    -rwxr-xr-x 1 root root 6569 Jan 2 10:29 ifdown-eth*
    -rwxr-xr-x 1 root root 6190 May 16 06:18 ifdown-ib*
    -rwxr-xr-x 1 root root 781 Jan 2 10:29 ifdown-ippp*
    -rwxr-xr-x 1 root root 4540 Jan 2 10:29 ifdown-ipv6*
    lrwxrwxrwx 1 root root 11 May 11 00:21 ifdown-isdn -> ifdown-ippp*
    -rwxr-xr-x 1 root root 2102 Jan 2 10:29 ifdown-post*
    -rwxr-xr-x 1 root root 1068 Jan 2 10:29 ifdown-ppp*
    -rwxr-xr-x 1 root root 870 Jan 2 10:29 ifdown-routes*
    -rwxr-xr-x 1 root root 1456 Jan 2 10:29 ifdown-sit*
    -rwxr-xr-x 1 root root 1621 Mar 17 2017 ifdown-Team*
    -rwxr-xr-x 1 root root 1556 Mar 17 2017 ifdown-TeamPort*
    -rwxr-xr-x 1 root root 1462 Jan 2 10:29 ifdown-tunnel*
    lrwxrwxrwx 1 root root 22 May 11 00:21 ifup -> ../../../usr/sbin/ifup*
    -rwxr-xr-x 1 root root 12415 Jan 2 10:29 ifup-aliases*
    -rwxr-xr-x 1 root root 910 Jan 2 10:29 ifup-bnep*
    -rwxr-xr-x 1 root root 13442 Jan 2 10:29 ifup-eth*
    -rwxr-xr-x 1 root root 10114 May 16 06:18 ifup-ib*
    -rwxr-xr-x 1 root root 12075 Jan 2 10:29 ifup-ippp*
    -rwxr-xr-x 1 root root 11893 Jan 2 10:29 ifup-ipv6*
    lrwxrwxrwx 1 root root 9 May 11 00:21 ifup-isdn -> ifup-ippp*
    -rwxr-xr-x 1 root root 650 Jan 2 10:29 ifup-plip*
    -rwxr-xr-x 1 root root 1064 Jan 2 10:29 ifup-plusb*
    -rwxr-xr-x 1 root root 4981 Jan 2 10:29 ifup-post*
    -rwxr-xr-x 1 root root 4154 Jan 2 10:29 ifup-ppp*
    -rwxr-xr-x 1 root root 2001 Jan 2 10:29 ifup-routes*
    -rwxr-xr-x 1 root root 3303 Jan 2 10:29 ifup-sit*
    -rwxr-xr-x 1 root root 1755 Mar 17 2017 ifup-Team*
    -rwxr-xr-x 1 root root 1876 Mar 17 2017 ifup-TeamPort*
    -rwxr-xr-x 1 root root 2711 Jan 2 10:29 ifup-tunnel*
    -rwxr-xr-x 1 root root 1836 Jan 2 10:29 ifup-wireless*
    -rwxr-xr-x 1 root root 5419 Jan 2 10:29 init.ipv6-global*
    -rw-r--r-- 1 root root 19948 Jan 2 10:29 network-functions
    -rw-r--r-- 1 root root 31027 Jan 2 10:29 network-functions-ipv6
    -rw-r--r-- 1 root root 157 Oct 21 2017 route-eth1
     
  4. cPanelLauren

    cPanelLauren Forums Analyst II
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    Hi @carock


    The name of the file doesn't necessarily mean it's the "device name" whats the output of the following:

    Code:
    grep -r DEVICE /etc/sysconfig/network-scripts/ifcfg-*
    Thanks!
     
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  5. carock

    carock Well-Known Member

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    Location:
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    /etc/sysconfig/network-scripts/ifcfg-eth1:DEVICE=eth1
    /etc/sysconfig/network-scripts/ifcfg-eth1:0:DEVICE=eth1:0
    /etc/sysconfig/network-scripts/ifcfg-lo:DEVICE=lo

    I found the recommendation today about disabling Network Manager for cPanel installations.

    I disabled it and created that ifcfg-eth0 file.

    Restarted the network services, but nothing changed. I'm going to try a reboot tonight and see if that helps.
     
  6. 24x7server

    24x7server Well-Known Member

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    Hi,

    Create ifcff-eth0 file with HWADDR as 5a:37:82:63:6e:12 and then try to restart the network daemon.
     
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