Windows xp dual-nic NAT awareness

Source: Internet
Author: User
Solution to a Single Windows XP dual-nic NAT problem --


Windows XP, dual network card, one connected to the internet, the other connected to the Intranet, do not work! Finally, I found out the crux of the problem... a concept: the number of hops.

The number of hops indicates the routing overhead, usually the number of hops to the IP target location. Everything on the local subnet is a hop, and every router that passes through it is another hop. If multiple routes have different hops to the same targetSelect the route with the lowest number of hops.



Windows XP sp2

Internet connection: 10 M [binding IP addresses to MAC addresses]

LAN connection: 100 M

Problem: After the M internal network card is enabled, you cannot access the Internet. Disable it! This problem causes NAT failure.

[1] initially suspected route problems, route print has

Active Routes:
Network Destination Netmask Gateway Interface Metric

Problem detected: the number of external network hops is greater than the number of Intranet hops.

Solution: modify the number of Intranet and Internet hops. After modification, the route print includes:

Active Routes:
Network Destination Netmask Gateway Interface Metric

Local Internet access and NAT are normal.

The actual process took several hours.

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