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DNS, internet, adsl, vdsl based some problems

One of my customer have 1 head office and 2 branches different locations. They have a server and two internet lines (ADSL and VDSL2)  in head office. Branchs have own servers and internet lines. All lines have static ip's. Servers are linux ubuntu.  They have 3 web sites, mail server (postfix),  mysql, etc.
On modems, nat and dhcp services is working. They have noip.com service for nameservers.
Problems :
1) Internal users cannot access to internal web sites via domains. (server and users in same subnet)
2) They using just one line actively, second line for backup. How can to use two internet connections same time in a network ?

2 Solutions
On point 1, are they running internal and external DNS servers?   IF their .com zone is defined on their internal dns server, all of the external addresses have to be entered here as well..
Does the server have an internal address as well as an external address?  If it has both, internal users can access ther server by its domain name.

On point 2, there are dsl aggregators (i think linksys/cisco makes one) that will let you configure either load balancing or redundancy of dsl lines.
To load balance and use both lines you need a load balancer.
This is not that all expensive.

if you need something more robust

next level up is fatpipe, which is more enterprise level.
sanatciAuthor Commented:
Thanks to all
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