free open source ipsec vpn

Hi All,

Would like to ask if there are free open source vpn software that supports gre ipsec vpn. because I have a problem with our vpn topology wherein our satellite office has to establish ipsec vpn with our 3 network at corporate office. IPSec vpn could not support this because our satellite office only has a flat network while our corporate office has a ton of network (cannot summarize the network).
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Matt VConnect With a Mentor Commented:
What kind of routers are you using to connect the offices to the Internet?  

GRE is a Cisco developed protocol, but some other vendors might support it.
junyapAuthor Commented:
Its Cisco Linksys RV042.
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