We are trying to configure our new Cisco SA520w with our Internet connection.
As soon as we replace our existing Linksys RV042 with the Cisco SA520w, we find that DNS lookups start to take longer and longer to resovle. For example, an nslookup against yahoo.com will timeout, or take 10-12 seconds. Web browser requests simillarly take 30-45 seconds to resolve.
We've tried using both Google's and OpenDNS servers, as well as our ISP's nameservers. In all cases, the long DNS resolution takes place.
At first we thought that the firewall was misconfigured. However, we removed all firwall rules, and continued to experience the problem.
We've tried checking and unchecking the DNSProxy checkbox, but this doesn't seem to have any noticeable impact.
Does anyone have any idea about which setting impact DNS looksups, or what else we might try to troubleshoot this issue?