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To access the web server and mail server from the internet your public ip and hostname should be in the /etc/resolv.conf like:

127.0.0.1 localhost
172.56.35.63 example.net example

For dynamic ip use dynamic dns servers like zoneedit.com , dnsexit.com, freedns.afraid.org and dns.he.net.

Setup the ddclient for zoneedit:

copy the ddclient to the /usr/sbin, make a dir /etc/ddclient and copy the ddclient.conf to it, create a dir /var/cache/ddclient and /var/run/ddcleint.
These are the changes in ddclient.conf for zoneedit.com:

#daemon=300    # check every 300 seconds
syslog=yes    # log update msgs to syslog
mail=root    # mail all msgs to root
mail-failure=root    # mail failed update msgs to root
pid=/var/run/ddclient.pid    # record PID in file.
ssl=yes    # use ssl-support. Works with
use=if,    if=ppp0    # via interfaces
## ZoneEdit (zoneedit.com)
##
server=legacy.zoneedit.com,    \
protocol=zoneedit1,    \
login= ,    \
password=     \
example.net,  www.example.net,  mail.example.net


Add the ddclient to the ip-up.local then ddcleint will update the ip in zoneedit.com server in every dialup connection.
For the other servers use their dns clients.

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