After continuing to work with Zywall support it was determined that this issue was caused by the large port forwarding range that had been setup for our VOIP phone system
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Zywall 35 DNS lookup Problem
We have a Zyxel Zywall 35 on the UTM 4.0.4(WZ.6) firmware - it exhibited the same behaviour on the 4.0.2(WZ.2) firmware - that is blocking DNS lookups. The dns servers are properly configured under the DNS section, on both the main tab and the DHCP tab, and we have all logging enabled but are unable to identify any apparent culprit in the logs. This firewall is intended to replace an existing pfsense firewall, and has been configured to mirror the pfsense's settings. We can swap the pfsense box in and everything works fine, but when we switch to the Zywall, we lose dns lookups from our workstations and our DNS servers. We still have internet connectivity and are able to ping, browse and connect via ip address, but are unable to resolve names. Any suggestions are appreciated.
Thanks,
Matt
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by: dpk_walPosted on 2009-11-01 at 04:46:24ID: 25713534
Are you using Zywall IP as DNS server; many firewalls cannot act as DNS Server itself; but can forward DNS requests; can you try specifying DNS server as given by ISP to be included in your DHCP scope [if applicable] and check results.
Use nslookup website dns-server-ip from CLI to check results.
Please check and update.
Thank you.