> DNS is UDP packet.Or have other reason.

The m0n0wall can operate as a DNS forwarder. This allows the clients to use
the m0n0wall as DNS server. The m0n0wall of course just queries the real DNS
servers in the internet to resolve host names.

Alternatively, the m0n0wall can tell the clients to use the real DNS servers
in the internet (via DHCP, if enabled).

What kind of configuration are you currently using at your site? (DHCP on
WAN, DHCP on LAN, DNS forwarder?)

- Klaus

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