Cent Os IP Tunnel

We have one real datacenter which we anounce our ip blocks and AS number in izmir and we have a virtual datacenter in istanbul which other datacenter anounce our ip addresses    (2 x /24 class)

for some reason we want to use the some ip addresses (for ex 185.xx.xx.2 and 185.xx.xx.5) in izmir (which is actually anounced by the datacenter in istanbul)

we decide to install 2 cent os and create an ip tunnel but could not figure it out how to do it.

should some body help us ?

note : we do not have any layer 3 equiqment in istanbul
FireBallITAsked:
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gheistConnect With a Mentor Commented:
EOIP is microtik's name for GRE VPN - old unencrypted style.
Normal processor core of today will do couple of gigagbits AES256. There is no sane reason to prefer dinosaur droppings to modern protocol with integrated security.
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gheistCommented:
stunnel
openvpn
IPSEC known as LibreSWAN in centos
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FireBallITAuthor Commented:
we are not looking for a vpn software we want to create a direct tunnel between two locations which other servers can conenct directly while trying to get ip address
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gheistCommented:
It is still VPN
If servers have fixed IPs - IPSEC
If not - OpenVPN
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nociSoftware EngineerCommented:
GRE is another possibility.
But why the resentment against IPSEC / OpenVPN.
In the current era it should be considered irresponsible  not to encrypt data in transit.
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FireBallITAuthor Commented:
What about eoip
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