The site in question has a 3620 running IOS 12.1. Its upstream ISP uses DHCP to transfer things like IP address and DNS server address(es), so the router will have its upstream Ethernet interface configured as a DHCP client.
The downstream LAN, connected to the other Ethernet interface, will use static /24 addressing (192.168.1.x) and NAT in the usual manner.
Question: How do we configure the router to forward DNS queries to the ISP's dynamically provided DNS server addresses? We don't necessarily want the router acting as a DNS server, or even a DNS cache. It just needs to transparently forward the queries and return the responses - like a $20 wireless router from Netgear will do.
I found the "dns forwarding" command but it is associated with DNS views which don't appear until IOS 12.4. Besides, this capability must have been around for a lot longer than 12.4. I just can't find how to do it in the IOS docs.
I'm happy to RTFM if someone will point me in the correct direction. Thanks!