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dhandy

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Yesterday we upgraded to 6.5.0 -- now today clients which connect are having DNS issues. We are using DHCP with DNS forwarding, and the same settings we have used for years (since WinRoute 4.x).

In the debug log, we do get this showing up:

{pktdrop} packet dropped: cannot perform NAT, no NAT address (from LAN Ethernet, proto:UDP, len:63, ip/port:xx.xx.xx.xx(source IP):xxxxx -> xx.xx.xx.xx(firewall IP):53, udplen:35)

If I enable DNS messages in the debug log, it appears the DNS query works, but it can't return the answer to the client:

{dns} Querying server 24.220.0.10, query id=13434
{dns} DnsResolver: DNS name 78.46.47.166 resolved from cache as ws.geonames.org
{dns} Reply from 24.220.0.10:53 id 13434.
{dns} Got answer from 24.220.0.10, id=13434
{dns} Host not found
{pktdrop} packet dropped: cannot perform NAT, no NAT address (from LAN Ethernet, proto:UDP, len:63, (etc)

We have rebooted, cleared the DNS cashe, disabled the cache all to no avail.

In case the traffic policy for DNS is corrupt, I created a new one and put it above the current policy:

source: interface connected to ethernet (local) LAN
dest: any
service: DNS
action: permit
translation: NAT

Any ideas on what now causes the "cannot perform NAT, no NAT address" message in the debug logs?

So far the only circumvention we have found is to put an explicit DNS server in the client PCs instead of using DHCP for the DNS entry. But we don't want to have to visit each PC to do that.
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