Hi,
I have some issue about GRE tunnel on router 3945 use c3900-universalk9-mz.SPA.151-4.M2 software by I create GRE tunnel connect to my site but it come up around 5 minute and line protocol is go down although I'm delete and recreate this interface but it has same issue. Below is GRE configuration detail:
interface Tunnel169
description *** BKK3-169-United-Center (TOT 768K) ***
bandwidth 768
ip address 10.245.94.121 255.255.255.252
ip mtu 1400
ip tcp adjust-mss 1300
ip ospf cost 20
load-interval 30
shutdown
qos pre-classify
keepalive 10 3
tunnel source 10.242.224.29
tunnel destination 10.242.224.30
end
and I show idb on router it show:
Router#sh idb
!
H 147 182 A,U,U Tunnel169 (IP features on swidbs(7), IPv6 features on swidbs(10))
!
I'm sure on my router not enable ipv6 but I don't know why idb showing seem like this GRE has been enabled ipv6. It will be root cause of this case. Kindly everyone ever meet this issue please share how you are fix it.
Thank you very much