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Full Discussion: ISP VPS, routing traffic
Special Forums IP Networking Proxy Server ISP VPS, routing traffic Post 302909414 by solaris_user on Wednesday 16th of July 2014 06:16:39 PM
Old 07-16-2014
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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SHOREWALL-RTRULES(5)						  [FIXME: manual]					      SHOREWALL-RTRULES(5)

NAME
rtrules - Shorewall Routing Rules file SYNOPSIS
/etc/shorewall/rtrules DESCRIPTION
Entries in this file cause traffic to be routed to one of the providers listed in shorewall-providers[1](5). The columns in the file are as follows. SOURCE (Optional) - {-|[&]interface|address|interface:address} An ip address (network or host) that matches the source IP address in a packet. May also be specified as an interface name optionally followed by ":" and an address. If the device lo is specified, the packet must originate from the firewall itself. Beginning with Shorewall 4.5.0, you may specify &interface in this column to indicate that the source is the primary IP address of the named interface. DEST (Optional) - {-|address} An ip address (network or host) that matches the destination IP address in a packet. If you choose to omit either SOURCE or DEST, place "-" in that column. Note that you may not omit both SOURCE and DEST. PROVIDER - {provider-name|provider-number|main} The provider to route the traffic through. May be expressed either as the provider name or the provider number. May also be main or 254 for the main routing table. This can be used in combination with VPN tunnels, see example 2 below. PRIORITY - priority The rule's numeric priority which determines the order in which the rules are processed. Rules with equal priority are applied in the order in which they appear in the file. 1000-1999 Before Shorewall-generated 'MARK' rules 11000-11999 After 'MARK' rules but before Shorewall-generated rules for ISP interfaces. 26000-26999 After ISP interface rules but before 'default' rule. MARK - {-|mark[/mask]} Optional -- added in Shorewall 4.4.25. For this rule to be applied to a packet, the packet's mark value must match the mark when logically anded with the mask. If a mask is not supplied, Shorewall supplies a suitable provider mask. EXAMPLES
Example 1: You want all traffic coming in on eth1 to be routed to the ISP1 provider. #SOURCE DEST PROVIDER PRIORITY MASK eth1 - ISP1 1000 Example 2: You use OpenVPN (routed setup /tunX) in combination with multiple providers. In this case you have to set up a rule to ensure that the OpenVPN traffic is routed back through the tunX interface(s) rather than through any of the providers. 10.8.0.0/24 is the subnet chosen in your OpenVPN configuration (server 10.8.0.0 255.255.255.0). #SOURCE DEST PROVIDER PRIORITY MASK - 10.8.0.0/24 main 1000 FILES
/etc/shorewall/rtrules SEE ALSO
http://shorewall.net/MultiISP.html http://shorewall.net/configuration_file_basics.htm#Pairs shorewall(8), shorewall-accounting(5), shorewall-actions(5), shorewall-blacklist(5), shorewall-hosts(5), shorewall_interfaces(5), shorewall-ipsets(5), shorewall-maclist(5), shorewall-masq(5), shorewall-nat(5), shorewall-netmap(5), shorewall-params(5), shorewall-policy(5), shorewall-providers(5), shorewall-proxyarp(5), shorewall-routestopped(5), shorewall-rules(5), shorewall.conf(5), shorewall-secmarks(5), shorewall-tcclasses(5), shorewall-tcdevices(5), shorewall-tcrules(5), shorewall-tos(5), shorewall-tunnels(5), shorewall-zones(5) NOTES
1. shorewall-providers http://www.shorewall.net/manpages/shorewall-providers.html [FIXME: source] 06/28/2012 SHOREWALL-RTRULES(5)
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