We have about 16 PCs in our office LAN that use a Netopia 3347-02 DSL modem/router for internet access (AT&T Business DSL). All PCs obtain their IP address from this router via DHCP and the router acts as the DNS server for the LAN as well. The results of the nslookup command shows the IP address of the Netopia as the DNS server. Throughout the day, all DNS lookups will suddenly fail, but the PCs can still ping the IP address of hosts on the internet. We can resolve the issue only by cycling power on the router. Once the router is powered up the name resolution begins to work again for a while.