GRE on router 800 serie

[pcfreak49]

I have a question how can you GRE tunnel on a cisco router 800 series set for a site to site vpn ipsec + gre who can help me?

[rizwanr74]

You cannot do much but you have to re-IP your LAN and WLAN.

R1

ip address 10.10.10.0 255.255.255.0 for LAN

ip address 10.10.20.0 255.255.255.0 for WLAN

R2

ip address 10.20.10.0 255.255.255.0 for LAN

ip address 10.20.20.0 255.255.255.0 for WLAN

Thanks

[pcfreak49]

you should do that for each range of IP addresses

[rizwanr74]

yes re-ip your network which will fix your duplicate fragmented networks from both ends.

you dont want to add individual static-route for individual network to tunnel interface on each router, then introduce routing protocol, which will exchange routes dynamically over the tunnel interface.

[rizwanr74]

Please rate helpful post.

thanks

[pcfreak49]

, it is possible to do so by means of a routing protocol such as OSPF and BGP in place of a static route to add

[rizwanr74]

"it is possible to do so by means of a routing protocol such as OSPF and BGP in place of a static route to add"

Yes, stay with OSPF or EIGRP and you do with BGP as well but BGP is for bigger network with gears about 1000 or more.

Please rate helpful posts.

thanks

[pcfreak49]

would configure OSPF how you do that though because then I tried to connect to another router

R1

router ospf 123

network 10.10.10.0 0.0.0.255 area 0

network 10.10.10.0 0.0.0.255 area 0

R2

router ospf 123

network 10.20.10.0 0.0.0.255 area 0

network 10.20.10.0 0.0.0.255 area 0

[rizwanr74]

Apply this on Router1

interface Tunnel0

ip address 11.11.11.1 255.255.255.252

exit

router ospf 123

network 11.11.11.0 0.0.0.3

----------------------------------------------

Apply this on Router2

interface Tunnel0

ip address 11.11.11.2 255.255.255.252

exit

router ospf 123
network 11.11.11.0 0.0.0.3

-------------------------------------------------------------

When done, look for ospf neighbor on network 11.11.11.0

Piece of strong advise, please use tunnel interface on /30 mask, othewise if your network grows you will run into problems and please make sure your tunnel interface contain private-ip address "11.11.11.0" is a public address.

Hope that helps.

thanks

[pcfreak49]

that have applied but can not connect to the other router?

[rizwanr74]

Can you ping the public address of the each other routers?

[pcfreak49]

yes I can ping the public ip address from R1 to R2 and to otherwise

[rizwanr74]

I do not get this, why your default-gateway going to same IP on both routers: 195.197.160.1?

Try this on router one.

on router one:

ip route 84.197.174.182 255.255.255.255 GigabitEthernet0

on router two:

ip route 84.197.161.59 255.255.255.255 GigabitEthernet0

Just to be sure, please also add this line below on both routers, "ip routing"

Please let me know.

thanks

[pcfreak49]

I did it but can not connect to the other router

[rizwanr74]

Hi there,

I did test your similar setup on my home lab, it was 100 successful.

Please review the config attached.

thanks

Rizwan Rafeek

[pcfreak49]

I tried as your router then restart it stops working