GRE over IPSEC with different end points

From: Ganesh Iyyappan (GaneshI@virtusa.com)
Date: Sun Aug 15 2004 - 12:33:47 GMT-3


Our side Client network
                GRE tunnel 10.10.10.2(pub ip) 50.50.50.1 (pub ip)
PIX-------------> 1750 Router -------------
Internet----------------------------- GRE/IPSEC Router
10.10.10.1 | |
(pub ip) | |
                Host1 20.20.20.1 40.40.40.1 Host2

Hi,

Requirement is,

Traffic from Host1 to Host2 should gothrough GRE tunnel over IPSEC,

Our client has configured IPSEC tunnel and GRE on the same router, and he want
us to do the same at our end, but the router doesn't have enough flash to load
the correct required IOS, So I have created a IPSEC tunnel on the PIX and
intiating GRE from the 1750 router. If I intiate traffic from the host1 to
host2, its flowing through the GRE then hits the PIX and the IPSEC tunnel get
created. ISKAKMP & IPSEC negoatiations completed without any errors, But there
are #send errors and traffic is not getting encrypted.

One problem here is on the client GRE/IPSEC router the tunnel end points for
both GRE & IPSEC is 10.10.10.1 (PIX), Will this work If I ask the client to
change the tunnel end points as below,

GRE end point - 10.10.10.2 (tunnel destination)
IPSEC end point - 10.10.10.1

Please guide me to get this done.

Thanks
Ganesh

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