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I have Clearos Enterprise 5.2 in Gateway mode. I have 3 NICs, one external (eth0), one lan with 3 subnets (eth1, eth2, eth3) and one hotlan (eth4). For a few weeks now I have been having an issue with DNS. It works most of the time, but then all of a sudden I can do nothing on my lan with DNS. IPs work fine and Internet works fine. I have not found anything that fixes this problem even temporarily. The only thing I can do is wait and within a day or two everything works again. I've googled and searched these forums but I cannot find anything that solves my problem.
Friday, July 15 2016, 04:55 PM
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    Saturday, August 13 2016, 01:31 PM - #Permalink
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    We use Proxmox to host our VMs.
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    Tuesday, August 02 2016, 10:59 PM - #Permalink
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    Calvin, off topic but out of intrest witch hypervisor do you use?
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    Tuesday, August 02 2016, 02:57 PM - #Permalink
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    The problem is another DNS server on the network. OpenWRT routers have an option 'This is the only DHCP in the local network'. Disabling that fixes the problem.
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    Saturday, July 16 2016, 01:21 PM - #Permalink
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    That's right, it's in a VM. It really works great and I'm not even sure if this is a Clearos problem. But since the problem is only LAN DNS I couldn't figure out any better possibilities. I'll keep working at this.
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    Saturday, July 16 2016, 08:04 AM - #Permalink
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    Hmm. That looks like you are running ClearOS in A VM. I'm not going to be able to help as there are too many factors I don't understand.
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  • Accepted Answer

    Friday, July 15 2016, 08:20 PM - #Permalink
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    lspci -v | grep Eth
    00:12.0 Ethernet controller: Red Hat, Inc Virtio network device
    00:13.0 Ethernet controller: Red Hat, Inc Virtio network device
    00:14.0 Ethernet controller: Red Hat, Inc Virtio network device
    00:15.0 Ethernet controller: Red Hat, Inc Virtio network device
    00:16.0 Ethernet controller: Red Hat, Inc Virtio network device


    grep eth /etc/modprobe.conf
    alias eth2 virtio_net
    alias eth3 virtio_net
    alias eth0 virtio_net
    alias eth1 virtio_net
    alias eth4 virtio_net


    uname -r
    2.6.18-308.1.1.v5PAE
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  • Accepted Answer

    Friday, July 15 2016, 06:28 PM - #Permalink
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    5.2 has gone end of life now so there is minimal support. I'm struggling to remember much about it. Can you give the output of:
    lspci -v | grep Eth
    grep eth /etc/modprobe.conf
    uname -r
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