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Configuring the Cisco router

Using Cisco IOS, you would configure the Cisco router as follows, using the addresses from the example:

config ter

crypto ipsec transform-set myset esp-3des esp-md5-hmac

no mode

exit

no ip access-list extended tunnel

ip access-list extended tunnel

permit gre host 192.168.5.113 host 172.20.120.141

exit

interface Tunnel1

ip address 10.0.1.2 255.255.255.0

tunnel source 192.168.5.113

tunnel destination 172.20.120.141

!

ip route 10.11.101.0 255.255.255.0 Tunnel1

end

clea crypto sa

clea crypto isakmp

For transport mode, change no mode to mode transport.

This is only the portion of the Cisco router configuration that applies to the GRE-over-IPsec tunnel. For more information, refer to the Cisco documentation.