Intermittent Cable/DSL Connection Using a Router
These are the primary reasons for intermittent router Internet connectivity:
1) The firmware needs upgrading.
Upgrade the firmware. MAKE SURE to read the instructions and warnings. Be especially cautious upgrading to "beta" firmware, since NETGEAR does not give customer support for it.
2) Anti-virus or other firewall programs are contending with the NETGEAR firewall. This is particularly a problem with Windows XP, which in some cases automatically starts a firewall.
Remove or disable the non-NETGEAR software.
3) If the connection stays off, it may be that your ISP is terminating the connection when renegotiating DHCP.
Contact your ISP about their policies.
4) Problems with dynamic IP address.
Set the IP to static. However, it may be difficult and expensive to do this. Some ISPs want to give static IPs only to businesses.
Less likely possibilities:
5) Idle time needs to be set to 0.
6) You have changed MTU size from the default.
Set the MTU back to the default value. The value depends on which router and firmware you use: it may be 1458, 1492, or 1500.
Doc ID: N100772.asp