Question

Cisco ASA5505 - Ping Hostname

Asked by: MrPrince

Hi,

How do I enable my ASA5505 to ping external hostnames? Pinging IPs is fine. ie.

FW-5505-01# ping www.google.co.uk
                               ^
ERROR: % Invalid Hostname

dns domain-lookup Outside is enabled as well as DNS servers and ISP Domain name.

Thanks.

This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.

Subscribe now for full access to Experts Exchange and get

Instant Access to this Solution

  • Plus...
  • 30 Day FREE access, no risk, no obligation
  • Collaborate with the world's top tech experts
  • Unlimited access to our exclusive solution database
  • Never be left without tech help again

Subscribe Now

Asked On
2009-04-08 at 00:16:24ID24304729
Tags

Cisco

,

ASA

,

ASA5505

,

Ping

Topics

Networking Hardware Firewalls

,

Cisco PIX Firewall

Participating Experts
2
Points
75
Comments
10

Trusted by hundreds of thousands everyday for fast, accurate and reliable tech support.

  • "The time we save is the biggest benefit of Experts Exchange to Warner Bros. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange." Mike Kapnisakis, Warner Bros.
  • "Our team likes having a resource that is more secure than just using Google and most experts using this service really know their stuff. It's nice to look here first versus using Google." Dayna Sellner, Lockheed Martin
  • "Anytime that I've been stumped with a problem, 9 out of 10 times Experts Exchange has either the accepted solution or an open discussion of the potential solution to the problem." Kenny Red, eBay Inc.

See what Experts Exchange can do for you.

Got a question?

We've got the answer.

Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.

Screenshot of Experts Exchange Knowledgebase

Need individual assistance?

Our experts are ready to help.

If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.

Screenshot of Experts Exchange Knowledgebase

Want to learn from the best?

Read articles from industry experts.

Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.

Screenshot of an Article

Working on a long term project?

Store your work and research.

Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.

Screenshot of Experts Exchange Knowledgebase

Access the answers to your technology questions today.

Subscribe Now

30-day free trial. Register in 60 seconds.

What Makes Experts Exchange Unique?

Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.

Trusted by the world's most respected brands.

image of each brand's logo

Faithfully serving IT professionals since 1996.

Experts Exchange Logo

Try it out and discover for yourself.

Subscribe Now

30-day free trial. Register in 60 seconds.

Related Solutions

  1. Cisco ASA5505 NATing issue
    Hi I have a Cisco ASA5505 50 User box I have been trying to setup for a few days now. I can do the initial basic setup of the box but once I add a static NAT it either stops DNS traffic or stops all IP traffic to the internet all together. Even after removing the static NAT i...
  2. DNS not routing through ASA5505
    I have a Cisco ASA5505 as a entry point to our lan. We have configured the VPN and have downloaded the client. The problem we're running into is: we're connecting successfully but cannot look up any machines on the "HQ" end (where the ASA is) by name. We can see ...
  3. ASA5505 port forwarding question
    Hello and thank you for your help if you are looking at this. I have an ASA 5505 that i have deployed in the field. Everything appears to be working on this device with the exception of getting to the mail server. We can ping the mail server by its internal ip address (10....
  4. Cisco VPN with ASA5505 and PIX506E
    Hello I have to configure a vpn between a CISCO ASA5505 and PIX506E. I''ve done some research on the net and configured the vpn to some extent. My vpn is up but I cannot ping the other side of the vpn. My network looks like this: On the cisco asa5505 external ip 81.196.151.17...
  5. Need help with basic Cisco ASA5505 configuration
    I need help with the following: 1. I am unable to access the internet. The problem appears to be the lack of a route from the Internal network to the external network. I receive an error that states "Failed to locate egress interface for UDP from inside:192.168.1.5/49...
  6. Another ASA5505 question
    Hello all, I am in the process of moving away from a D-Link DFL-1100 and into a Cisco ASA5505. So far so good. I have received a lot of help from several people and for the most part, I think I have this ready for the switch over. I am having one issue though, and I am be...

Free Tech Articles

  1. WARNING: 5 Reasons why you should NEVER fix a computer for free.
    It is in our nature to love the puzzle. We are obsessed. The lot of us. We love puzzles. We love the challenge. We thrive on finding the answer. We hate disarray. It bothers us deep in our soul. W...
  2. SCCM OSD Basic troubleshooting
    SCCM 2007 OSD is a fantastic way to deploy operating systems, however, like most things SCCM issues can sometimes be difficult to resolve due to the sheer volume of logs to sift through and the dispe...
  3. Migrate Small Business Server 2003 to Exchange 2010 and Windows 2008 R2
    This guide is intended to provide step by step instructions on how to migrate from Small Business Server 2003 to Windows 2008 R2 with Exchange 2010. For this migration to work you will need the fo...
  4. Create a Win7 Gadget
    This article shows you how to create a simple "Gadget" -- a sort of mini-application supported by Windows 7 and Vista. Gadgets can be dropped anywhere on the desktop to provide instant information, ...
  5. Outlook continually prompting for username and password
    There have been a lot of questions recently regarding Outlook prompting for a username and password whilst using Exchange 2007. There are a few reasons why this would happen and I will try to cover t...
  6. Backup Exchange 2010 Information Store using Windows Backup
    There seems to be quite a lot of confusion around the ability to backup Exchange 2010 using the built in Windows Backup feature. This stems from the omission of this feature prior to Exchange 2007 s...

Cloud Class Webinars

  1. Avoiding Bugs in Microsoft Access
    Alison Balter takes and in-depth look at avoiding bugs in Access. In this webinar you will learn about using the immediate window to debug your applications, invoking the debugger, using breakpoints to troubleshoot, stepping through code, setting the next statement to execute, ...
  2. Top 10 Best New Features in Visio 2010
    Scott Helmers gives live demonstrations of the top 10 new features in Visio 2010. This webinar will teach you how to create compelling diagrams by adding shapes to the page with a single click, linking the shapes in a diagram to data in Excel (or SQL Server, or SharePoint), ...
  3. IT Consultant Business Secrets Revealed
    Michael Munger, Experts Exchange tech pro and IT consultant, pulls back the curtain on his very successful businesses and answers question on every IT consultant and business owner should know about. He shares secrets on what he did to solve the 5 most common problems in IT, ...
  4. Disaster Recovery and Business Continuity
    Quest CTO, Mike Billon, gives an overview of the steps involved in building a dunamic disaster recovery plan. Through case studies and an examination of software/hardware tooles for monitoring and testing, you'll gain a better understandin of where you are, where you want ...
  5. Organize Your Visio Diagrams with Containers and Lists
    Scott Helmers uses cross functional flowcharts, wireframe diagrams, data graphic legends and seating charts to teach you: how to ustilize all three new structured diagram components in Visio 2010, the best practices for organizeing shapes in previous version of Visio, how to organize ...
  6. How to Us Objects, Properties, Events and Methods in Microsoft Access
    Alison Dalter gives an in-depbth look at objects, properties, events and methods in Microsoft Access. In this webinar you will learn about using the object browser, referring to objects, working with properties and methods, working with object variables, understanding the ...

Join the Community

Give a Little. Get a Lot.

Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.

Join the Community

Answers

 

by: mitrushiPosted on 2009-04-08 at 02:05:35ID: 24095073

It should work fine if you have
dns domain-lookup Outside
dns server-group DefaultDNS
 name-server x.x.x.x

you can debug dns queries by entering debug dns 1 or debug dns 2

 

by: PeteLongPosted on 2009-04-08 at 03:04:10ID: 24095336

 

by: MrPrincePosted on 2009-04-08 at 12:05:41ID: 24100672

My config for that is currently:

dns domain-lookup Outside
dns server-group ISP_DNS_Servers
 name-server xxx.xxx.xxx.xxx [actual DNS server]
 name-server xxx.xxx.xxx.xxx [actual DNS server]
 domain-name xxxxxx.net [actual ISP domian name]

Must I use dns server-group DefaultDNS?

Thanks.

 

by: mitrushiPosted on 2009-04-08 at 12:16:21ID: 24100749

no you don't. what about a debug dns 2? where you able to run this debug?

 

by: MrPrincePosted on 2009-04-08 at 14:01:07ID: 24101711

Unit is at home, so will try then and get back.

Thanks.

 

by: MrPrincePosted on 2009-04-08 at 21:34:36ID: 24104041

OK, I turned on debugging for DNS and tried a ping again. This is what I got:

FW-5505-01# ping www.google.co.uk
DNS: get global group DefaultDNS handle 1533b4d
DNS: Resolve request for 'www.google.co.uk' group DefaultDNS
DNS: No Context name servers defined
DNS: get global group DefaultDNS handle 1533b4d
                 ^
ERROR: % Invalid Hostname
FW-5505-01# DNS: Resolve request for 'www.google.co.uk' group DefaultDNS
DNS: No Context name servers defined

I then deleted my old DNS Server-Group since it looks like it was looking for DefaultDNS and added a new one in called DefaultDNS and tried again. This is what I got:

DNS: get global group DefaultDNS handle 1533b4d
DNS: Resolve request for 'www.google.co.uk' group DefaultDNS
DNS: No response
DNS: No response
DNS: No response
DNS: No response
DNS: No response
DNS: No response
DNS: get global group DefaultDNS handle 1533b4d
DNS: Resolve request for 'www.google.co.uk' group DefaultDNS
DNS: No response
DNS: No response
DNS: No response
DNS: No response
DNS: No response
DNS: No response

Strange my clients can resolve hostnames but my ASA can't. Here's the relavant section of my outbound ACL concerning DNS.

object-group network ISP_DNS_Servers
 network-object 64.59.114.18 255.255.255.255
 network-object 64.59.114.19 255.255.255.255

access-list Outbound remark Allow DNS
access-list Outbound extended permit udp 10.1.5.0 255.255.255.248 object-group ISP_DNS_Servers eq domain

Points upped. Thanks.

 

by: mitrushiPosted on 2009-04-09 at 10:52:36ID: 24109696

I am not sure but it can be an acl blocking traffic. I am running the same dns config on my lab without any problem so I am assuming it is not a config problem.

 

by: MrPrincePosted on 2009-04-09 at 13:59:04ID: 24111543

Could it by due to a policy map? My config for that is:

policy-map type inspect dns preset_dns_map
 parameters
  message-length maximum 512
  id-randomization
  id-mismatch action log
policy-map global_policy
 class inspection_default
  inspect dns preset_dns_map

Is there anything I need to do to my ACLs to allow traffic outbound from the FW itself?

 

by: mitrushiPosted on 2009-04-09 at 23:45:53ID: 24113747

You can try and remove this policy map in order to see the result although this policy will affect all traffic and you are saying that PCs behind ASA can resolve names correctly. I am assuming that you have not changed default settings for management access ACL and it works fine with default settings. Can you post complete config so we can have a look? Also you can run the packet capture tool and use a network analyzer to see in details what is going on with dns queries originating from the outside interface.

 

by: MrPrincePosted on 2009-04-13 at 09:41:55ID: 24130999

Hi, thanks for the info. Problem turned out to be one hop along at the perimeter router. I noticed NAT wasn't properly working so the packets weren't traversing the Internet properly. Fixed the issue and now the FW is ping with IPs and Hostnames.

Im splitting the points since your suggestions did lead to the eventual fix.

Cheers.

20120131-EE-VQP-002

3 Ways to Join

30-Day Free Trial

The Experts

98% positive feedback on 31,087 answers since March 2000. angeliii is a Microsoft Most Valuable Professional for his work with MS SQL Server & Develoment.

He has also proven his knowledge of Visual Basic Programming, PHP Scripting and Oracle Databases.

The Experts

97% positive feedback on 10,752 answers since July 2000. lrmoore has more than 18 years experience in the networking industry.

The six-time Mircosoft MVPs specialties include firewalls, virtual private networking, and network management.

Testimonials

"...and excellent source for support... Kind of like having your very own IT dept." Electriciansnet

Testimonials

"I was apprehensive at signing up at first. However... it has already made my life as an IT administrator much easier." JaCrews

Testimonials

"WOW! You guys have great, active, and knowledgeable people on here." moore50

Business Clients

Business Clients

In the Press

"If you’ve got a question... Experts Exchange can supply an answer.”

In the Press

"...an invaluable aid for both IT professionals and those who require tech support."

In the Press

"where IT professionals provide quick answers on just about any topic"

Business Account Plans

Loading Advertisement...