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Can't Resolve Host Name on UTM side from Red appliance.

TCF
I have a RED50 it is setup in split/transparent mode. I am getting my IP Address from the Router on the RED side. Everything is working great except DNS doesn't seem to be working properly. I can surf the internet but if I want to connect to a server on the UTM side I have to used the IP address instead of the Host Name.

ex: 192.168.0.1 instead of \MYFILESERVER


I have the same policies in place for the Red device as computers on the UTM . A firewall policy is set for the RED to use DNS.

In the UTM -> DNS

I have our DNS servers listed as forwarders and request routing.


Any ideas? Or things I should check for.


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  • 0
    Do you also have configured a DNS suffix? Otherwise \SERVERNAME will only be a NETBIOS (broadcast) name which will not traverse over the RED link. With a Suffix set your client will try:

    SERVERNAME.domainname.tld even when you just enter SERVERNAME. 

    This can also be influenced by DHCP option 046 (WINS/NBT Node Type).

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

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  • 0
    Do you also have configured a DNS suffix? Otherwise \SERVERNAME will only be a NETBIOS (broadcast) name which will not traverse over the RED link. With a Suffix set your client will try:

    SERVERNAME.domainname.tld even when you just enter SERVERNAME. 

    This can also be influenced by DHCP option 046 (WINS/NBT Node Type).

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

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