?
Solved

VPN solution

Posted on 2007-04-04
1
Medium Priority
?
240 Views
Last Modified: 2010-04-12
This question is more educational than an actual technical/configuration issue. I currently run a small network with an edge c2620 router and a layer 2 3560G switch which does VLAN trunking to a linux firewall/gateway for my end hosts.

My firewall, which sits on the DMZ, is also currently running OpenVPN so users can remotely VPN into the internal network. As this is just currently a beta network, certificate based authentication is all that's used.

Now, this is where my slight dilemma falls into place. I need to allow a set of users to VPN who I don't trust as much. I don't necessarily feel it's a great idea to give them certificate based auth cause they can just toss the certificate on any client and be able to VPN. Also, I'm not responsible for security on their workstations, so if they get compromised, the attacker will have access to my network.

I'd like to figure out a solution to the above. My end users, located in an overseas office, do not have access to their gateway. That, and I'm not entirely sure any of my network equipment have an IOS that supports VPN, but I may be wrong.

Will OpenVPN still be an adequate solution? Should I just make all users authenticate against LDAP? Is there anyway to leave certain users on just certificate based auth and others on LDAP based auth?

0
Comment
Question by:stevefNYC
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
1 Comment
 
LVL 11

Accepted Solution

by:
kblack05 earned 2000 total points
ID: 18883476
OpenVPN is a great solution. The alternatives are IPSec, which is prone to breakage, and also buying a Cisco concentrator or similar (which is phenomenally expensive). Here is a great article which covers all the caviets of the comparison: http://www.linuxjournal.com/article/7949

With respects to your claim of clients hopping on any node they wish and copying the keys, there is a simple solution for this. Add clients allowed by network block in IP Tables rather than opening OpenVPN ports up to the globe.

A basic iptables rules looks like this:
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -A INPUT -i eth0 -p udp -s ip_addr_of_the_other_router --sport 1194 --dport 1194 -j ACCEPT
iptables -A OUTPUT -o eth0 -p udp -d ip_addr_of_the_other_router --dport 1194 --sport 1194 -j ACCEPT
iptables -A INPUT -i tun0 -j ACCEPT
iptables -A OUTPUT -o tun0 -j ACCEPT
iptables -A FORWARD -i tun0 -j ACCEPT

http://www.linuxhorizon.ro/openvpn-brief.html
0

Featured Post

Percona Live Europe 2017 | Sep 25 - 27, 2017

The Percona Live Open Source Database Conference Europe 2017 is the premier event for the diverse and active European open source database community, as well as businesses that develop and use open source database software.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

When you try to share a printer , you may receive one of the following error messages. Error message when you use the Add Printer Wizard to share a printer: Windows could not share your printer. Operation could not be completed (Error 0x000006…
This article explains the fundamentals of industrial networking which ultimately is the backbone network which is providing communications for process devices like robots and other not so interesting stuff.
If you're a developer or IT admin, you’re probably tasked with managing multiple websites, servers, applications, and levels of security on a daily basis. While this can be extremely time consuming, it can also be frustrating when systems aren't wor…
There's a multitude of different network monitoring solutions out there, and you're probably wondering what makes NetCrunch so special. It's completely agentless, but does let you create an agent, if you desire. It offers powerful scalability …
Suggested Courses

800 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question