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Sophos xg can't resolve own hostname and internal server

initB10r

Hello all,

I am currently trying to configure Sophos xg to replace my Fritzbox.

From problems with certificates, I have become aware that my DNS resolution for internal hosts and the xg itself is not working.

Currently I have only a test client, which has the xg entered as the default gateway and DNS server.

When accessing blocked websites I always had problems with the certificate and had read somewhere that I should choose the hostname of the firewall as redirection page so that there are no problems with the CN.
Here I found out that I can not make a ping on the name of the XG. Now I added the XG as DNS-HOST, but it still does not work. Also other host, which are meanwhile also registered as DNS host I can not reach via ping.

Does anyone have an idea what I have configured wrong?

Many greetings
Marc



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  • 0 in reply to initB10r

    Hi,

    Please post a copy of your DNS setup, there appears to be an issue with the XG DNS configuration. Also check the DNS setting on your test device.

    Ian

    XG115W - v20 GA - Home

    XG on VM 8 - v20 GA

    If a post solves your question please use the 'Verify Answer' button.

  • 0 in reply to rfcat_vk

    Hello Ian,

    hopefully here are all the information:

    Have I forgotten a configuration? I'm currently having a bit of trouble with the configuration. I had administered an asg8 years ago.

    Regards
    Marc

  • 0 in reply to initB10r

    Hi,

    thank you for all there screenshots.

    The XG should be using an external DNS, where you would add the XG as an internal DNS is in the DHCP settings.

    Ian

    XG115W - v20 GA - Home

    XG on VM 8 - v20 GA

    If a post solves your question please use the 'Verify Answer' button.

  • 0 in reply to rfcat_vk

    Hello Ian,

    is it not possible to have only the XG as DNS server?

    Regards
    Marc

  • 0 in reply to initB10r

    Yes,  it is but on the internal side not the external side. You need to provide some external DNS access to resolve lookups.

    Ian

    XG115W - v20 GA - Home

    XG on VM 8 - v20 GA

    If a post solves your question please use the 'Verify Answer' button.

  • 0 in reply to rfcat_vk

    Hello Ian,

    thanks for the answer

    Doesn't the lookup of external names work automatically via the WAN interface? I am not sure what I need to change.

    Sorry for possible stupid questions.

    Regards
    Marc

  • 0 in reply to initB10r

    But, you have told the WAN interface to use the internal address of the XG as its lookup.

    In the DNS settings change the DNS to use DHCP settings for the WAN interface or used fixed as you have.

    I have mine set to use my ISP's DNS IP4 and IPv6, alot of people use 8.8.8.8 or 4.4.4.4 or 1.1.1.1 which are a mix of Google and Cloudflare DNS.

    Ian

    XG115W - v20 GA - Home

    XG on VM 8 - v20 GA

    If a post solves your question please use the 'Verify Answer' button.

  • 0 in reply to rfcat_vk

    Hi Ian,

    now I changed DNS 1 to 8.8.8.8 and the dns query configuration

    The network configuration on my client looks like this:

       IPv4-Adresse  . . . . . . . . . . : 172.16.3.100
       Subnetzmaske  . . . . . . . . . . : 255.255.248.0
       Standardgateway . . . . . . . . . : 172.16.0.2 (XG)
       DNS-Server  . . . . . . . . . . . : 172.16.0.2(XG)

    Unfortunately, it still doesn't work.

    Even ipconfig /flushdns on the client does not help.

    Regards

    Marc

  • 0 in reply to initB10r

    Please remove the 127 address, that is an internal nonevroutable address and should not be on the external interface.

    then allow time for the XG to update its tables.

    ian

    XG115W - v20 GA - Home

    XG on VM 8 - v20 GA

    If a post solves your question please use the 'Verify Answer' button.

  • 0 in reply to rfcat_vk

    Hi Ian,

    I have now removed 127 and waited about 3 hours. Unfortunately without success. Restarting the XG does not work either.

    What I notice is that when I execute the following command on my client, a DNS error occurs:

        netsh interface ipv4 set dnsservers name="Ethernet 2" static 172.16.0.2

        The configured DNS server is incorrect or does not exist.
        
    Any idea?

    Regards

    Marc

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