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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Route classifier in tc(8)					       Linux						 Route classifier in tc(8)

NAME
route - route traffic control filter SYNOPSIS
tc filter ... route [ from REALM | fromif TAG ] [ to REALM ] [ classid CLASSID ] [ action ACTION_SPEC ] DESCRIPTION
Match packets based on routing table entries. This filter centers around the possibility to assign a realm to routing table entries. For any packet to be classified by this filter, a routing table lookup is performed and the returned realm is used to decide on whether the packet is a match or not. OPTIONS
action ACTION_SPEC Apply an action from the generic actions framework on matching packets. classid CLASSID Push matching packets into the class identified by CLASSID. from REALM fromif TAG Perform source route lookups. TAG is the name of an interface which must be present on the system at the time of tc invocation. to REALM Match if normal (i.e., destination) routing returns the given REALM. EXAMPLES
Consider the subnet 192.168.2.0/24 being attached to eth0: ip route add 192.168.2.0/24 dev eth0 realm 2 The following route filter will then match packets from that subnet: tc filter add ... route from 2 classid 1:2 and pass packets on to class 1:2. NOTES
Due to implementation details, realm values must be in a range from 0 to 255, inclusive. Alternatively, a verbose name defined in /etc/iproute2/rt_realms may be given instead. SEE ALSO
tc(8), ip-route(8) iproute2 21 Oct 2015 Route classifier in tc(8)

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