Dynamic
DNS service is provided by dyndns.com (no-ip.org is good as well). ddclient script is called at system
startup. This periodically checks what IP address has been assigned to the PPP
interface and contacts the Dynamic DNS
server to update the DNS entry. Thus the router is always reachable using a
domain name even though the WAN IP address may change whenever the PPP session
is restarted.
root@voyage:/etc/init.d#
ls
README
killprocs
php-fastcgi ssh
bootlogs
klogd
pppd-dns sudo
bootmisc.sh
kmod
procps sysklogd
checkfs.sh live
radvd udev
checkroot.sh
live-config
rc udev-mtab
cron
mountall-bootclean.sh rc.local umountfs
ddclient mountall.sh
rcS umountnfs.sh
dibbler-client mountdevsubfs.sh
reboot umountroot
dnsmasq
mountkernfs.sh
resolvconf urandom
ebtables mountnfs-bootclean.sh
rmnologin voyage-pxe
halt
mountnfs.sh
rpcbind voyage-sync
hostapd
mountoverflowtmp
rsync voyage-util
hostname.sh
mtab.sh
sendsigs watchdog
hwclock.sh
networking
single wd_keepalive
ifplugd
nocatsplash
skeleton wide-dhcpv6-client
ddclient
gets settings from /etc/ddclient.conf
root@voyage:~# cat /etc/ddclient.conf
daemon=600
# check every 600 seconds
# log update msgs to syslog
syslog=yes
# Mail failed updates to user
mail-failure=lorcan@horrorthon.com
# record PID in file.
pid=/var/run/ddclient.pid
## Detect IP with our CheckIP server
use=web, web=checkip.dyndns.com/, web-skip='IP
Address'
## DynDNS username and password here
login=xxxxxx
password=xxxxxx
## Default options
protocol=dyndns2
server=members.dyndns.org
## Dynamic DNS hosts
xxxxxxxx.dyndns-remote.com
To debug dynamic DNS, run ddclient in debug mode
root@voyage:~# ddclient
-daemon=0 -noquiet -debug
DEBUG: proxy =
DEBUG: url =
checkip.dyndns.com
DEBUG: server = checkip.dyndns.com
DEBUG: get_ip: using web,
checkip.dyndns.com reports xx.xx.xx.xx
WARNING: cannot update xxxxxx.dyndns-remote.com
from xx.xx.xx.xx to xx.xx.xx.xx until after Thu Jan 1 00:00:30 1970.
DEBUG: proxy =
DEBUG: url =
myip.dnsomatic.com
DEBUG: server = myip.dnsomatic.com
DEBUG: get_ip: using web,
myip.dnsomatic.com reports xx.xx.xx.xx
WARNING:
cannot update opendns_network_label from xx.xx.xx.xx to xx.xx.xx.xx until after
Thu Jan 1 00:00:30 1970.
It's not working in this case, and
the error is related to the system date. What date does it think it is?
root@voyage:~# date
Sat Dec 12 19:05:29 GMT 1914
Not sure what's gone wrong there,
but might as well install NTP to keep the system time up to date.
root@voyage:~# apt-get
install ntp
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
libcap2 libopts25
Suggested packages:
ntp-doc
The following NEW packages will be installed:
libcap2 libopts25 ntp
0 upgraded, 3 newly installed, 0 to remove and 112 not
upgraded.
Need to get 628 kB of archives.
After this operation, 1448 kB of additional disk space
will be used.
Do you want to continue [Y/n]? Y
Get:1 http://cdn.debian.net/debian/ wheezy/main libcap2
i386 1:2.22-1.2 [14.0 kB]
Get:2 http://cdn.debian.net/debian/ wheezy/main
libopts25 i386 1:5.12-0.1 [72.2 kB]
Get:3 http://cdn.debian.net/debian/ wheezy/main ntp
i386 1:4.2.6.p5+dfsg-2 [542 kB]
Fetched 628 kB in 5s (122 kB/s)
Selecting previously unselected package libcap2:i386.
(Reading database ... 18045 files and directories
currently installed.)
Unpacking libcap2:i386 (from
.../libcap2_1%3a2.22-1.2_i386.deb) ...
Selecting previously unselected package libopts25.
Unpacking libopts25 (from
.../libopts25_1%3a5.12-0.1_i386.deb) ...
Selecting previously unselected package ntp.
Unpacking ntp (from
.../ntp_1%3a4.2.6.p5+dfsg-2_i386.deb) ...
Setting up libcap2:i386 (1:2.22-1.2) ...
Setting up libopts25 (1:5.12-0.1) ...
Setting up ntp (1:4.2.6.p5+dfsg-2) ...
[ ok ] Starting NTP server: ntpd.
Check NTP. These timeservers are
installed by default.
root@voyage:~# ntpq
-p
remote
refid st t when poll reach
delay offset jitter
==============================================================================
-ns1.ooonet.ru
89.109.251.23 2 u 9
64 1 132.414 1.078 0.737
+service0-eth4.d 195.111.98.17 2
u 7 64 1
79.145 -5.807 0.906
+ntp.goneco.de 129.69.1.153
2 u 5 64 1
66.232 -4.427 1.494
*hosted.by.pcext 193.190.230.66 2
u 3 64 1
46.044 -5.622 0.631
Check the date again
root@voyage:~# date
Wed Jul 17 22:06:58 GMT 2013
Restart ddclient in debug mode
again
root@voyage:~# ddclient -daemon=0 -noquiet -debug
DEBUG: proxy =
DEBUG: url =
checkip.dyndns.com
DEBUG: server = checkip.dyndns.com
DEBUG: get_ip: using web,
checkip.dyndns.com reports xx.xx.xx.xx
DEBUG: proxy =
DEBUG: url = myip.dnsomatic.com
DEBUG: server = myip.dnsomatic.com
DEBUG: get_ip: using web,
myip.dnsomatic.com reports xx.xx.xx.xx
DEBUG:
DEBUG: nic_dyndns2_update
-------------------
DEBUG: proxy =
DEBUG: url =
http://members.dyndns.org/nic/update?system=dyndns&hostname=xxxxxx.dyndns-remote.com&myip=86.40.184.26
DEBUG: server = members.dyndns.org
SUCCESS:
updating xxxxxx.dyndns-remote.com: good: IP address set to xx.xx.xx.xx
