Solve : Multiple gateway settings problem?

1.	Solve : Multiple gateway settings problem?
Answer» There's a PC which is PROVIDES kinda update service for all workstations in my company. It gets updates from the internet every hour. The PC stations in DEFAULT site A. And apart from workstations in site A, workstations in site B needs to get updates as WELL, with different gateway IP. However, while the internet gateway is set, workstations from site B will be unable to connect to get updates. How to set the 2 gateways which it can goes to the internet and ALLOW site B workstation to connect at the same time, without changing gateway time to time?

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