GRE/IP Tunneling in Cisco 803

[VPhilip]

I use a 803 ISDN Router to connect to the Corporate Office. The corporate office has setup a tunnel protocol with GRE/IP initialized, on a 3640.

The 803 config is as follows:

interface Tunnel0
bandwidth 64
ip unnumbered Dialer0
no ip directed-broadcast
tunnel source 192.77.2.4
tunnel destination 192.77.2.2
tunnel sequence-datagrams
tunnel checksum
!
description connected to EthernetLAN
ip address 160.170.81.70 255.255.255.192
no ip directed-broadcast
no keepalive
!
interface Dialer0
ip address 192.77.2.4 255.255.255.0
no ip directed-broadcast
encapsulation ppp
dialer idle-timeout 300
dialer string 5555555
dialer pool 1
dialer-group 1
!
ip route 160.170.13.0 255.255.255.0 Tunnel0
ip route 192.77.2.0 255.255.255.0 Dialer0
ip route 210.208.106.0 255.255.255.0 Tunnel0
!
access-list 101 permit ip any any
dialer-list 1 protocol ip permit
!

The call gets initiated but I cannot access any host on the 160. LAN or the 210. LAN. When I check the Tunnel interface on the 803 it shows this statement:

Tunnel protocol/transport uninitialized, key disabled
instead of
Tunnel protocol/transport GRE/IP, key disabled

which is what shows up on the 3640 Router.

What am I doing wrong? Thanks in advance.

 

[ditleporc]

I think i have the same problem, my GRE tunnel works fine but from the 2 end router i can't ping the other side IP adresses.
I can't ping the other side of the tunnel, then i think my OSPF routing can't work... Do you kwon how to ping the other side of a tunnel from the originator router ?

 

[VPhilip]

Try pinging from any host on the LANs on either side. You may also ping the other router's assigned IP address from the first router's telnet/console session.

I have solved my problem with a bit of tweaking. The tunnel protocols on both routers must be setup similar. Specifically check the bandwidth parameter and the MTU parameter. Set these such that they are identical on both routers.

Bye