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Cannot resolve hostname via RED

jmtheron
I can access devices at the main site using the FQDN but not via hostname.

ping honstname.domain.com works
ping IP works
ping honstname does not work.

I am using RED with Standard split mode.


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  • 0
    How are the DNS and DHCP settings at the remote site?
    All handled by the UTM?

    Please give more info, this way we can't help...

    ----------
    Sophos user, admin and reseller.
    Private Setup:

    • XG: HPE DL20 Gen9 (Core i3-7300, 8GB RAM, 120GB SSD) | XG 18.0 (Home License) with: Web Protection, Site-to-Site-VPN (IPSec, RED-Tunnel), Remote Access (SSL, HTML5)
    • UTM: 2 vCPUs, 2GB RAM, 50GB vHDD, 2 vNICs on vServer (KVM) | UTM 9.7 (Home License) with: Email Protection, Webserver Protection, RED-Tunnel (server)
  • 0
    Yes the UTM is the DHCP server for the remote site.
    At the remote site the DNS server is the IP of the RED.

    At the main site the remote network is added to the DNS allowed networks, openDNS servers are being used for DNS forwarders,  and request routing is inplace for the internal domain.
  • 0
    Have you added your domain name in the "Domain" field of the DHCP config for that site?

    ----------
    Sophos user, admin and reseller.
    Private Setup:

    • XG: HPE DL20 Gen9 (Core i3-7300, 8GB RAM, 120GB SSD) | XG 18.0 (Home License) with: Web Protection, Site-to-Site-VPN (IPSec, RED-Tunnel), Remote Access (SSL, HTML5)
    • UTM: 2 vCPUs, 2GB RAM, 50GB vHDD, 2 vNICs on vServer (KVM) | UTM 9.7 (Home License) with: Email Protection, Webserver Protection, RED-Tunnel (server)
  • 0
    Since the computername is a NETBIOS name this will normally be not able to respond to pings from remote subnets since NETBIOS is a broadcast protocol.
    If you still want to ping machinename from remote site, you will need to append the domain name to your host by DHCP and maybe even use DHCP options 15 and/or 119.

    The other option is running a WINS-server and have DHCP tell you where it is. You will need to install a WINS-server first to do this however.

    If it's just one or two machines you need to access by hostname, you could also add it in the HOSTS file of the machines that need to access is from the RED's location. But this would only work if you have fixed IP-addresses for these hostnames.

    Managing several Sophos UTMs and Sophos XGs both at work and at some home locations, dedicated to continuously improve IT-security and feeling well helping others with their IT-security challenges.

    Sometimes I post some useful tips on my blog, see blog.pijnappels.eu/category/sophos/ for Sophos related posts.

  • 0
    Thank you scorpionking,

    It is working now that i added the domain to the DHCP server.
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