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DNS Host for External IP

jdmoore0883

I have a Sophos GW with a Dynamic external IP address. I want to have my internal hosts resolve a domain to that external interface.

So, I define a host object, test.tld, and define it with a "static" ip that matches up to the external interface. From my internal network, if i run "nslookup test.tld", it resolved properly.

Problem is, that since my external interface is a dynamic IP, that host entry will be valid for a limited time only. When my external IP eventually gets renewed (and changed), I will have to go back in and find the object and re-define it. This very quickly loses practicality once you start defining many such hosts.

So how can I define a host to resolve to the external IP, regardless of what the IP actually is?



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    Hi,

    In situations situations where your network is not guaranteed to always have the same public IP, it is not practical to manually update the public DNS record every time the ISP dips the line and the IP changes. Thankfully, Sophos UTM supports Dynamic DNS which makes it easy to deploy these features even when you don’t have a static public IP.

    Register with a free dynamic DNS services available online. Later, configure Sophos UTM to make use of the service you just registered for.

    1. Log into the Sophos UTM Web Admin interface
    2. Select Network Services | DNS | DynDNS and click + New DynDNS
    3. Select the correct type (the service you registered for)
    4. For IP strategy select Web service (IPv4)
    5. For the hostname filed specify the hostname you defined when signing up for the Dynamic DNS service
    6. Specify the username and password for the service
    7. Click Save

    Finally, configure your router for inbound traffic forwarding on Sophos external interface.

    Thanks

    Sachin Gurung
    Team Lead | Sophos Technical Support
    Knowledge Base  |  @SophosSupport  |  Video tutorials
    Remember to like a post.  If a post (on a question thread) solves your question use the 'This helped me' link.

  • 0 in reply to sachingurung

    sachingurung said:

    Hi,

    In situations situations where your network is not guaranteed to always have the same public IP, it is not practical to manually update the public DNS record every time the ISP dips the line and the IP changes. Thankfully, Sophos UTM supports Dynamic DNS which makes it easy to deploy these features even when you don’t have a static public IP.

    Register with a free dynamic DNS services available online. Later, configure Sophos UTM to make use of the service you just registered for.

    1. Log into the Sophos UTM Web Admin interface
    2. Select Network Services | DNS | DynDNS and click + New DynDNS
    3. Select the correct type (the service you registered for)
    4. For IP strategy select Web service (IPv4)
    5. For the hostname filed specify the hostname you defined when signing up for the Dynamic DNS service
    6. Specify the username and password for the service
    7. Click Save

    Finally, configure your router for inbound traffic forwarding on Sophos external interface.

    Thanks

    What would be nice, is to have a user defined dyn service. if we could define our dyn service provider we wouldn't have to put up with the short list Sophos provides us with. Is it Possible?

Reply
  • 0 in reply to sachingurung

    sachingurung said:

    Hi,

    In situations situations where your network is not guaranteed to always have the same public IP, it is not practical to manually update the public DNS record every time the ISP dips the line and the IP changes. Thankfully, Sophos UTM supports Dynamic DNS which makes it easy to deploy these features even when you don’t have a static public IP.

    Register with a free dynamic DNS services available online. Later, configure Sophos UTM to make use of the service you just registered for.

    1. Log into the Sophos UTM Web Admin interface
    2. Select Network Services | DNS | DynDNS and click + New DynDNS
    3. Select the correct type (the service you registered for)
    4. For IP strategy select Web service (IPv4)
    5. For the hostname filed specify the hostname you defined when signing up for the Dynamic DNS service
    6. Specify the username and password for the service
    7. Click Save

    Finally, configure your router for inbound traffic forwarding on Sophos external interface.

    Thanks

    What would be nice, is to have a user defined dyn service. if we could define our dyn service provider we wouldn't have to put up with the short list Sophos provides us with. Is it Possible?

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