Hello ,
I have a DMVPN cloud with 40 spokes and 2 Hubs. The routing protocol is EIGRP. Some of the spokes are behind an ADSL modem and some are behind a 3G router(the spoke ip address is getting Natted to the modem public IP). Clearly the spokes does not have a fixed public IP. So now am facing an issue that when the 3G modem or ADSL modem restarts the public IP changes and the spokes looses the connection to hub. I tried isakmp keepalives and invalid-spi-recovery. I ran packet capture on the hub and found that even after the spoke up address is changed the hub sending the packets to the old ip address.Please help me to resolve the issue ASAP.
The spoke config is
crypto isakmp policy 1
encr 3des
hash md5
authentication pre-share
group 2
crypto isakmp key xxxxxx
crypto ipsec transform-set DMVPN-TS esp-aes esp-sha256-hmac
mode transport
crypto ipsec profile xxxxxxxxxxx
set security-association lifetime seconds 86400
set transform-set DMVPN-TS
interface Tunnel0
description ***To HQ Primary WAN Router***
ip address x.x.x.x 255.255.255.0
no ip redirects
ip mtu 1400
ip nhrp authentication xxxxx
ip nhrp map multicast dynamic
ip nhrp map multicast x.x.x.x
ip nhrp map x.x.x.x x.x.x.x
ip nhrp network-id 1
ip nhrp nhs x.x.x.x
ip tcp adjust-mss 1360
no ip split-horizon eigrp 101
tunnel source g0/1
tunnel mode gre multipoint
tunnel key x.x.x.x
tunnel protection ipsec profile xxxxxxxxxx
The Hub config is
crypto isakmp policy 1
encr 3des
hash md5
authentication pre-share
group 2
crypto isakmp key xxxxxxxxxxxx
crypto ipsec profile xxxxxxxxxxxx
set security-association lifetime seconds 86400
set transform-set DMVPN-TS
interface Tunnel0
description *** To BRANCHES ***
ip address x.x.x.x x.x.x.x
no ip redirects
ip mtu 1400
no ip split-horizon eigrp 101
ip nhrp authentication xxxxx
ip nhrp map multicast dynamic
ip nhrp network-id 1
ip nhrp shortcut
ip nhrp redirect
ip tcp adjust-mss 1360
tunnel source GigabitEthernet0/1
tunnel mode gre multipoint
tunnel key xxxxxxxxxx
tunnel protection ipsec profile xxxxxxxxxx
end
Thanks in advance
Shabeeb
