We have a lease line connected to a Linksys router. From the Linksys we take it to NetGear and Vonage. Here is the problem i have. When i give obtain ip address automatically everything works fine. But when i give 'use following ip address' and configure the ip, subnet and default gateway outlook does not work and google.com throws 500 error frequently (but not consistently). Most of the other sites work fine.
What could be the issue?