Comments on: Voice lab – Running GNS3 as root

By: Chiguidagui

Chiguidagui — Sat, 10 Apr 2010 04:44:51 +0000

It works !!! Thank you very much !!!

By: Chiguidagui

Chiguidagui — Fri, 09 Apr 2010 15:46:01 +0000

Ok I will…
Thanks again…

By: Josh

Josh — Fri, 09 Apr 2010 14:36:56 +0000

Chiguidagui,

It sounds like you are having a problem with bridging. Try this tutorial.

http://www.blindhog.net/linux-bridging-for-gns3-lan-communications/

Josh

By: Chiguidagui

Chiguidagui — Fri, 09 Apr 2010 08:42:03 +0000

Hi Josh,
I forgot to tell you that:
1.- I have try clearing arp on both machines (XP and Ubuntu);
2.- I had rebooted all the PCs and restarted all conections from scratch;
3.- I had sniffed the traffic;
4.- I had controlled the arp table over and over again.
5.- I had debugged the ip and arp traffic from R1
6.- I had manually populated the arp table with the missing values, but it does not help at all…

No matter what I try the arp table has always an “incomplete” value for the other device on the Ubuntu machine…

Meaning (and this happens only on the Ubuntu PC):
1.- On R1, there is an incomplete entry for the Cloud (“nio_gen_eth:eth0″ – 10.0.0.5/29)
2.- On the Cloud, there is and incomplete entry for R1 (on GNS3 – ios 7200, – 10.0.0.2/29)

Do you think that there may be a default firewall (on Ubuntu) protecting any of these devices ???

Thank you,
Tony

By: Chiguidagui

Chiguidagui — Thu, 08 Apr 2010 21:13:31 +0000

Hi Josh,
The problem is on the Ubuntu machine…

I am able to ping from both Ubuntu/GNS3 devices to XP and from XP to both Ubuntu/GNS3 devices.

I am not able to ping none of the devices on Ubuntu from the other Ubuntu device…
Meaning: I am not able to ping the Cloud (Ubuntu/GNS3 “nio_gen_eth:eth0″ at 10.0.0.5/29), from R1 (Ubuntu/GNS3 – ios 7200, at 10.0.0.2/29) neither the other way around.

The problem is on the Ubuntu/GNS3 devices.

Ubuntu eth0 does not see GNS3 R1 and vice versa…

Thanks

By: Josh

Josh — Thu, 08 Apr 2010 06:31:06 +0000

Chiguidagui,

If you are not able to ping the xp machine from the ubuntu machine or the router, the problem is most likely the windows firewall. It needs to be disabled.

It looks like all machines are on the same subnet. You might check arp tables on both machines and the router.

Windows – arp -a
IOS – show arp
Linux – arp -a

In regards to purchasing a new machine…I would suggest anything with at least a dual-core processor and 8GB RAM for complex topologies.

Josh

By: Chiguidagui

Chiguidagui — Thu, 08 Apr 2010 04:55:19 +0000

Hi Josh, I am sorry for the delay.
Let me explain it in my limited English…
I am attempting to run SDM on Ubuntu (to which I am new)…
I already put SDM to work through wine, and it runs…
I logged on to Ubuntu as root, and created a topology consisting in:
1. – Just one Router “R1”, with ios 7200, at 10.0.0.2/29;
2. – And a Cloud, associated to nio_gen_eth:eth0 at 10.0.0.5/29,

All done as your tutorial indicates.
The link went on immediately with no errors.

Well, the thing is that I am non able to ping any of these devices from the other…
Meaning: the Cloud do not ping R1, neither R1 pings the Cloud…

Ironically, I can ping both from a wired XP box, located at 10.0.0.4/29, from which it
is possible to run SDM to manage R1.

The .net file is as follows…

autostart = False
[localhost:7200]
workingdir = sdm_working
udp = 10000
[[7200]]
image = /home/tony/Desktop/GNS3/Cisco_ios/ios-7200/c7200-jk9o3s-mz.124-17/C7200-JK.BIN
ghostios = True
[[ROUTER R1]]
console = 2000
cnfg = /root/Desktop/GNS3/General/SDM/sdm_configs/R1.cfg
slot0 = C7200-IO-2FE
f0/0 = nio_gen_eth:eth0
x = -139.0
y = -104.0
[GNS3-DATA]
configs = sdm_configs
workdir = sdm_working
[[Cloud C2]]
x = -7.5
y = -105.0
connections = R1:f0/0:nio_gen_eth:eth0

P.S. I am ignorant on hardware, but it seems to me that GNS3 needs lots, and
lots, and even more lots of resources…
I am planning to build a PC to run much more complicated topologies…
Which hardware combinations you suggest?

Thank you again,
Tony

By: Josh

Josh — Tue, 06 Apr 2010 02:58:42 +0000

Chiguidagui,

I am not sure what you are trying to do. How are you trying to connect the devices?

Josh

By: Chiguidagui

Chiguidagui — Sat, 03 Apr 2010 21:48:12 +0000

Thanks for your lab Josh.
I would like to ask you a question.
I follow your lab, and I was able to create a link between a 7200 router and a cloud on Ubuntu. Unfortunately, there is no connectivity between the devices.
Any ideas?
Thanks again!

By: crown

crown — Tue, 30 Mar 2010 21:17:06 +0000

have made a silly mistake with (actually without) “NOT”

Do not really anderstand WHY to se +x, or even run as root, when THE problem is NOT permission related…

It is port binding problem.. People ar being confused !!!
Performe this steps to resolve problem’s root:
1 check your dynamips config (preferences) settings >> default setting are that Base UDP uses 10000 UDP port.

Just typed >> netstat |grep 10000 got
unix 3 [ ] STREAM CONNECTED 10000 ;
UPD 1000 is ALREADY being used by your lihnux/unix system (socket connection), thats why it doesn’t work!!!!!!!!

Increase UPD base port to be like 10045 (after that make changes in your net file) and EVERETHING will work fine.