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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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WVDIAL(1)						      General Commands Manual							 WVDIAL(1)

NAME
wvdial - PPP dialer with built-in intelligence. SYNOPSIS
wvdial [ OPTIONS ] [ SECTION ] ... DESCRIPTION
wvdial is an intelligent PPP dialer, which means that it dials a modem and starts PPP in order to connect to the Internet. It is something like the chat(8) program, except that it uses heuristics to guess how to dial and log into your server rather than forcing you to write a login script. When wvdial starts, it first loads its configuration from /etc/wvdial.conf and ~/.wvdialrc which contains basic information about the modem port, speed, and init string, along with information about your Internet Service Provider (ISP), such as the phone number, your username, and your password. Then it initializes your modem and dials the server and waits for a connection (a CONNECT string from the modem). It understands and responds to typical connection problems (like BUSY and NO DIALTONE). Any time after connecting, wvdial will start PPP if it sees a PPP sequence from the server. Otherwise, it tries to convince the server to start PPP by doing the following: o responding to any login/password prompts it sees; o interpreting "choose one of the following"-style menus; o eventually, sending the word "ppp" (a common terminal server command). If all of this fails, wvdial just runs pppd(8) and hopes for the best. It will bring up the connection, and then wait patiently for you to drop the link by pressing CTRL-C. OPTIONS
Several options are recognized by wvdial. -c, --chat Run wvdial as a chat replacement from within pppd, instead of the more normal method of having wvdial negotiate the connection and then call pppd. -C, --config=CONFIGFILE Run wvdial with CONFIGFILE as the configuration file, instead of /etc/wvdial.conf. This is mainly useful only if you want to have per-user configurations, or you want to avoid having dial-up information (usernames, passwords, calling card numbers, etc.) in a system wide configuration file. -n, --no-syslog Don't output debug information to the syslog daemon (only useful together with --chat). wvdial is normally run without command line options, in which case it reads its configuration from the [Dialer Defaults] section of /etc/wvdial.conf. (The configuration file is described in more detail in wvdial.conf(5) manual page.) One or more SECTIONs of /etc/wvdial.conf may be specified on the command line. Settings in these sections will override settings in [Dialer Defaults]. For example, the command: wvdial phone2 will read default options from the [Dialer Defaults] section, then override any or all of the options with those found in the [Dialer phone2] section. If more than one section is specified, they are processed in the order they are given. Each section will override all the sections that came before it. For example, the command: wvdial phone2 pulse shh will read default options from the [Dialer Defaults] section, then override any or all of the options with those found in the [Dialer phone2] section, followed by the [Dialer pulse] section, and lastly the [Dialer shh] section. Using this method, it is possible to easily configure wvdial to switch between different internet providers, modem init strings, account names, and so on without specifying the same configuration information over and over. BUGS
"Intelligent" programs are frustrating when they don't work right. This version of wvdial has only minimal support for disabling or over- riding its "intelligence", with the "Stupid Mode", "Login Prompt", and "Password Prompt" options. So, in general if you have a nice ISP, it will probably work, and if you have a weird ISP, it might not. Still, it's not much good if it doesn't work for you, right? Don't be fooled by the fact that wvdial finally made it to version 1.00; it could well contain many bugs and misfeatures. Let us know if you have problems by sending e-mail to <wvdial-list@lists.nit.ca>. You may encounter some error messages if you don't have write access to /etc/ppp/pap-secrets and /etc/ppp/chap-secrets. Unfortunately, there's really no nice way around this yet. FILES
/etc/wvdial.conf Configuration file which contains modem, dialing, and login information. See wvdial.conf(5). /dev/ttyS* Serial port devices. /etc/ppp/peers/wvdial Required for correct authentication in pppd version 2.3.0 or newer. /etc/ppp/{pap,chap}-secrets Contains a list of usernames and passwords used by pppd for authentication. wvdial maintains this list automatically. AUTHORS
Dave Coombs and Avery Pennarun for Net Integration Technologies. We would also like to thank SuSE and RedHat for adding a number of vari- ous cool features to wvdial. Thanks guys! SEE ALSO
wvdial.conf(5), wvdialconf(1), pppd(8), chat(8). WvDial December 2005 WVDIAL(1)
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