Question

ppp0 not picking up VNC connection

Asked by: shaunwingin

Say, when I try connect to CentOS server with VNC viewer to ip: 42.44.6.139 nothing gets logged.But if I ping or ssh it is picked up. I can login via vnc to eth0. VNC server listening on all ports.Please help.
This is my routing
[root@localhost sysconfig]# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
dsl-146-152-01. *               255.255.255.255 UH    0      0        0 ppp0
192.168.1.0     *               255.255.255.0   U     0      0        0 eth1
192.168.10.0    *               255.255.255.0   U     0      0        0 eth0
169.254.0.0     *               255.255.0.0     U     0      0        0 eth1
default         *               0.0.0.0         U     0      0        0 ppp0

and my Firewall:
Saving firewall rules to /etc/sysconfig/iptables:          [  OK  ]
Chain INPUT (policy DROP 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination
    8   320 ACCEPT     tcp  --  any    any     anywhere             anywhere            tcp dpt:ssh
    0     0 LOG        all  --  any    any     anywhere             anywhere            LOG level warning
    0     0 ACCEPT     all  --  lo     any     anywhere             anywhere
    0     0 ACCEPT     all  --  eth0   any     anywhere             anywhere
    0     0 ACCEPT     all  --  ppp0   any     anywhere             anywhere
    0     0 ACCEPT     all  --  any    any     anywhere             anywhere            state RELATED,ESTABLISHED

Chain FORWARD (policy DROP 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination

Chain OUTPUT (policy ACCEPT 6 packets, 756 bytes)
 pkts bytes target     prot opt in     out     source               destination
and
[root@localhost sysconfig]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:02:E3:4C:A0:05
          inet addr:192.168.10.77  Bcast:192.168.10.255  Mask:255.255.255.0
          inet6 addr: fe80::202:e3ff:fe4c:a005/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:29066996 errors:1 dropped:0 overruns:0 frame:0
          TX packets:29066454 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:2074256317 (1.9 GiB)  TX bytes:374799651 (357.4 MiB)
          Interrupt:201

eth1      Link encap:Ethernet  HWaddr 00:06:4F:7D:17:05
          inet addr:192.168.1.100  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::206:4fff:fe7d:1705/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:29452 errors:0 dropped:0 overruns:0 frame:0
          TX packets:58244 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:3449712 (3.2 MiB)  TX bytes:4473441 (4.2 MiB)
          Interrupt:177 Base address:0xcc00

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:1868 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1868 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:3674111 (3.5 MiB)  TX bytes:3674111 (3.5 MiB)

ppp0      Link encap:Point-to-Point Protocol
          inet addr:42.44.6.139  P-t-P:164.144.152.1  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1492  Metric:1
          RX packets:275 errors:0 dropped:0 overruns:0 frame:0
          TX packets:589 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3
          RX bytes:43357 (42.3 KiB)  TX bytes:37983 (37.0 KiB)

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
2009-08-19 at 08:17:26ID24665112
Topics

Linux Network Security

,

CentOS

,

Linux Networking

Participating Experts
2
Points
500
Comments
4

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. Install VNC on Linux
    I have a deticated server, It seems to have XWindows installed. How can i install VNC on it? I only access the server using putty or Ftp at the moment. Is there a command I can use in putty that wil install and run the vnc server?
  2. VNC
    I got several machines on my Local network, as for some reasons, I need to enable access to a certain machine which is not within the LAN, e.g. Machine A , through VNC. What should I do for that? As the machine A's IP is not a real IP. Would there be any ports I need to open...
  3. Turning on VNC on a linux server via SSH
    How do I turn VNC on, on a linux server? I have a connection via SSH, but not sure how to turn the VNC on so that I can get a GUI display through Chicken of the VNC.

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: nociPosted on 2009-08-20 at 00:36:45ID: 25139987

I dont known what rules are used excatly for LOG...
But ssh is picked up BEFORE the log rule, so the logrule never matches. If there is an -p tcp in the logrule then it won't match icmp (=PING and more).

please if you show iptables configuration dor
iptables -L -nv
and present that output.

 

by: shaunwinginPosted on 2009-08-20 at 08:18:01ID: 25143608

Tx. I found a workaround with ssh tunnel Tx.

 

by: KeremEPosted on 2009-08-20 at 19:06:11ID: 25148611

BTW how can you VNC to the eth0 from outside? It seems that you're trying to VNC to ppp port from inside. Which would work only routing is active. You can activate it using:

echo "1" > /proc/sys/net/ipv4/ip_forward

 

by: nociPosted on 2009-08-21 at 02:19:16ID: 25150107

Hm ssh tunnel works & vnc doesn't? The definitely makes no sense as ip has no special cases based on portnumbers.....

The difference is the you connect with ssh to the local interface and then locally access the outside interface..... (if coming from inside)...
then why not connect to VNC using the local interface.... Now you are using ssh as a special tunnel routing tool

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...