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DDNS Problem 7 years 3 months ago #35992

Dear all,

have Cisco 837 router in the main office for a company so there are 10 branches should be connected with the main office using VPN so the configuration is opertional and tested by making a connection using Cisco VPN client program but the problem now is changing the ip address so I did the following:

1- create an account in no-ip website the account is :

2- do the ddns configuration as the following:
sh run
Building configuration...

Current configuration : 4096 bytes
version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
hostname Router
memory-size iomem 5
no logging buffered
enable secret 5 $1$/M.M$JyYjWejFmPXvEpxgP6A5k.
aaa new-model
aaa authentication login default local
aaa authentication login sdm_vpn_xauth_ml_1 local
--More-- aaa authorization exec default local
aaa authorization network sdm_vpn_group_ml_1 local
aaa session-id common
resource policy
ip subnet-zero
no ip dhcp use vrf connected
ip dhcp pool cisco
ip cef
ip name-server
ip name-server
no ip ips deny-action ips-interface
ip ddns update method MYUPDATE
--More-- interval maximum 0 0 5 0
username test privilege 15 password 0 123456
username admin privilege 15 password 0 123456
crypto isakmp policy 1
encr 3des
authentication pre-share
group 2
crypto isakmp xauth timeout 15

crypto isakmp client configuration group CISCOGROUP
key cisco123
pool SDM_POOL_1
acl 100
--More-- !
crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac
crypto dynamic-map SDM_DYNMAP_1 1
set transform-set ESP-3DES-SHA
crypto map SDM_CMAP_1 client authentication list sdm_vpn_xauth_ml_1
crypto map SDM_CMAP_1 isakmp authorization list sdm_vpn_group_ml_1
crypto map SDM_CMAP_1 client configuration address respond
crypto map SDM_CMAP_1 65535 ipsec-isakmp dynamic SDM_DYNMAP_1
interface Ethernet0
ip address
ip nat inside
ip virtual-reassembly
ip tcp adjust-mss 1412
hold-queue 100 out
interface Ethernet2
--More-- no ip address
hold-queue 100 out
interface ATM0
no ip address
no atm ilmi-keepalive
dsl operating-mode auto
interface ATM0.1 point-to-point
pvc 8/35
pppoe-client dial-pool-number 1
interface FastEthernet1
duplex auto
speed auto
interface FastEthernet2
duplex auto
speed auto
interface FastEthernet3
--More-- duplex auto
speed auto
interface FastEthernet4
duplex auto
speed auto
interface Dialer0
ip ddns update hostname
ip ddns update MYUPDATE
ip address negotiated
ip mtu 1492
ip nat outside
ip virtual-reassembly
encapsulation ppp
dialer pool 1
dialer-group 1
ppp authentication chap pap callin
ppp chap hostname munee1
ppp chap password 0 123456
ppp pap sent-username muneer1 password 0 123456
crypto map SDM_CMAP_1
--More-- ip local pool SDM_POOL_1
ip classless
ip route Dialer0
ip http server
no ip http secure-server
ip dns server
ip nat inside source route-map SDM_RMAP_1 interface Dialer0 overload
access-list 1 remark SDM_ACL Category=16
access-list 1 permit
access-list 100 remark SDM_ACL Category=4
access-list 100 permit ip any
access-list 101 remark SDM_ACL Category=2
access-list 101 deny ip host
access-list 101 deny ip host
access-list 101 deny ip host
access-list 101 deny ip host
access-list 101 deny ip host
access-list 101 deny ip host
access-list 101 deny ip host
access-list 101 deny ip host
access-list 101 deny ip host
--More-- access-list 101 deny ip host
access-list 101 deny ip host
access-list 101 permit ip any
dialer-list 1 protocol ip permit
route-map SDM_RMAP_1 permit 1
match ip address 101
line con 0
no modem enable
line aux 0
line vty 0 4
password cisco
scheduler max-task-time 5000


And this is the debug output:
*Mar 1 10:29:36.971: DYNDNSUPD: Adding DNS mapping for <=
*Mar 1 10:29:36.971: HTTPDNS: Update add called for <=>
*Mar 1 10:29:36.971: HTTPDNSUPD: Session ID = 0x17
*Mar 1 10:29:36.971: HTTPDNSUPD: URL = ''
*Mar 1 10:29:36.971: HTTPDNSUPD: Sending request
*Mar 1 10:29:57.023: HTTPDNSUPD: Call returned Connection time out for update m <=>
*Mar 1 10:29:57.023: DYNDNSUPD: Another update completed (outstanding=0, total=
*Mar 1 10:29:57.023: HTTPDNSUPD: Clearing all session 23 info

Please note this:
This ip [] which appear in the debug is the current ip address for the dialer 0 and that is good but when I ping to the reply return from the ip address which written when I added the host in the no-ip account as shown in the attached image so this is written [ like something static ] how can the router change it !! ?? or maybe the host creation is wrong.

Waiting for your answer ..


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