Most IPsec clients give you a choice. You can force all traffic through the VPN tunnel (sometimes called restricted mode) or have the VPN carry only traffic destined for the LAN addresses behind the associated VPN gateway (split tunnels). Some IPsec VPN implementations even let you setup complex routing schema so you can have really fine-grained control over how and where packets go.
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Related Q&A from Retired Expert - Mark Tuomenoksa
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