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ISP VPS, routing traffic

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Routing traffic from ISP datacenter to enterprise LAN

Hi guys

I need to setup server/router in my firm. We got from our ISP dedicated server in their data center. It has a static IP and it servers as replacement for out DSL connection. I configured our internal server to be border gateway and to connects to data center. "Remote" admin installed squid and IT staff can access to the websites but other can't. I want to remove that proxy server. I think I really don't need it.

Here is the picture how above situation looks

Image

Server router has two NICs, one is connected to ISP router which we can't access, and one nic is connected to our private LAN. I use CentOS Linux 6.5 x64 to act as router. I added in iptables firewall to forward all traffic from eth0 to eth1 (from internal to public) and allowed traffic to leave server. All output traffic is nated.

Problem is on the other site. I'm not a network engineer but only with some knowledge in networking and formal IT education at the firm. My problem is I can't ping anything on the Internet while our VPS can. On that same server only port 80 and 22 are opened. People who setup proxy can connect to outside world but can't ping, can't use other networking software.

I have some questions:

How I can see my private LAN from ISP network, I will need to setup VPN in the short time ?
Is possible to avoid proxy and just with firewall NAT get data from the net back to the hosts in the private LAN ?

I am afraid to mess with ISP server because they administrate that server, we are and I really won't to understand how configure a network.

Thanks for reading and suggestions.

Last edited by solaris_user; 07-16-2014 at 07:26 PM..
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dtc-xen_migrate(8)					      System Manager's Manual						dtc-xen_migrate(8)

NAME
dtc-xen_migrate - migrate a VPS to another Xen server SYNOPSIS
LOCAL_VPS_ID DESTINATION_HOSTNAME [ DEST_VPS_ID ] DESCRIPTION
dtc-xen_migrate This shell script is a part of the dtc-xen package that is to be used by the dtc panel to manage a Xen VPS server. Note that you need rsync in both the source and the destination dom0. This script is used to move the content of a Xen virtual machine (VM) managed with dtc-xen to another Xen server of the same type. The VM destination will first be prepared, then the local VM will be shut down, then it's content will be transfered over using rsync. Note that this is NOT a live migration, and down time of approximatively the time needed for the rsync will occure. PARAMETERS
LOCAL_VPS_ID The DTC-Xen id of the VM, from 00 to 99. DESTINATION_HOSTNAME Destination Xen server hostname to migrate to. DEST_VPS_ID Destination DTC-Xen id of the VM, from 00 to 99. EXAMPLE
dtc-xen_migrate 19 alpha.example.com 21 This will migrate the content of xen19 on the local machine to the destination server alpha.example.com using xen21 as VM name. SEE ALSO
dtc_reinstall_os(8), dtc_kill_vps_disk(8) dtc-xen_migrate(8)

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