Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

Cisco vpn client dns problems

Posted on 2006-06-23
8
Medium Priority
?
595 Views
Last Modified: 2008-01-09
We have recently setup vpn remote access to our company and everything, but one thing is working great.  When a user connects by the cisco vpn client they are not able to access the servers here on site by the dns name.  For example we have a server by the name of pylon_server.  A vpn remote user cannot connect to the server by using \\pylon_server, but instead must use the ip address of \\10.1.1.5.  This may be a simple problem to fix, but the COO just called wanting to access the server by name, so I need an answer quickly.
0
Comment
Question by:icarus2256
  • 4
  • 3
8 Comments
 
LVL 13

Expert Comment

by:prashsax
ID: 16971798
The quick solution would be to add entries in the host file on this computer.

Other wise, you need to check if you have allowed access to your internal DNS Server. This could be due to split tunnel VPN config.

What kind of VPN are you using.
0
 

Author Comment

by:icarus2256
ID: 16971814
The VPN termination point is a Cisco ASA 5510.  The remote users are using the Cisco VPN client.  I am not looking for a quick fix, but the correct fix.
0
 
LVL 13

Expert Comment

by:prashsax
ID: 16971831
What is the access-list for the VPN users.

Have you configured your internal DNS IP address for VPN clients as well.

Does your access-list allow UDP/53 from VPN clients.
0
Managing Security & Risk at the Speed of Business

Gartner Research VP, Neil McDonald & AlgoSec CTO, Prof. Avishai Wool, discuss the business-driven approach to automated security policy management, its benefits and how to align security policy management with business processes to address today's security challenges.

 

Author Comment

by:icarus2256
ID: 16971851
We are using the permit-ipsec rule so the outside access-list doesn't filter VPN traffic.
0
 
LVL 9

Assisted Solution

by:NYtechGuy
NYtechGuy earned 800 total points
ID: 16971928

In the VPN config, you can specify what DNS servers your clients will be issued when they connect.  

/Justin
0
 
LVL 13

Expert Comment

by:prashsax
ID: 16971944
permit-ipsec is used so that you do not have to allow ipsec traffic inside your firewall.

But once this traffic is decrypted, it is again evaulated against an access-list.

Since this traffic is originating from subnet different from your internal their must exist some acl for the VPN IP Pool.

look for access-list where source ip is from pool you have defined for vpn clients.

Also make sure you have specified a valid DNS server in the configuration.

e.g

vpngroup group_name dns-server x.x.x.x
0
 

Author Comment

by:icarus2256
ID: 16972007
Do you know where you specify the DNS servers when using the Cisco ASDM interface?  Sorry about the permit-ipsec comment, we do allow all ip traffic from remote vpn connections into the company.
0
 
LVL 13

Accepted Solution

by:
prashsax earned 800 total points
ID: 16972054
Configuration > VPN > General > Group Policy > Add/Edit > Internal Group Policy > General Tab

See this link.
http://www.cisco.com/en/US/products/ps6121/products_user_guide_chapter09186a00806a2fc9.html

0

Featured Post

Who's Defending Your Organization from Threats?

Protecting against advanced threats requires an IT dream team – a well-oiled machine of people and solutions working together to defend your organization. Download our resource kit today to learn more about the tools you need to build you IT Dream Team!

Question has a verified solution.

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

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.
In this article, WatchGuard's Director of Security Strategy and Research Teri Radichel, takes a look at insider threats, the risk they can pose to your organization, and the best ways to defend against them.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…

572 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