It is currently Sun Oct 25, 2020 11:47 am


All times are UTC




Post new topic Reply to topic  [ 3 posts ] 
Author Message
 Post subject: Ping problems in GNS3 VBE between VBox and a router
PostPosted: Wed Oct 05, 2011 12:32 am 
Offline

Joined: Tue Oct 04, 2011 4:49 am
Posts: 7
Hi, I'm new to this forum and inexperienced with GNS3, I have just upgraded to GNS3 VBE edition and set up microcore in the latest Virtualbox, including a microcore clone with each having one network adapter attached as a host only adapter (vboxnet0).

I had problems when attaching VBox1 eth0 to router R1 interface, I could not get it to ping.

However I eventually found that on starting the VirtualBox instance in GNS3, VirtualBox had created a second interface as a UDP tunnel, this appeared on the VBox1 instance as eth1, I removed the ip address from eth0 and added an IP address to eth1 (even though I was still attached between router interface f2/0 and eth0), and lo, I could now ping the interface.

I discovered this when I checked the arp tables, VBox1 arp was incomplete, Router1 arp showed a connection to the eth1 MAC address with the eth0 ip address

Hope all that made sense, but my question is, is this the way it should be done?, have I got something misconfigured? I am quite confused over this apparent mismatch.
If no one can help me answer this, at least I hope this odd experience can help someone else get theirs going.

Secondly, it is a pain to have to constantly change IP addresses on each VBox instance and add default routes etc, is there a way to save this info like the router configs are saved?

regards to all especially the genius's who make all this possible for us.

Eric




Top
 Profile  
 
 Post subject: Re: Ping problems in GNS3 VBE between VBox and a router
PostPosted: Wed Oct 05, 2011 1:55 am 
Offline

Joined: Tue Sep 20, 2011 3:32 am
Posts: 35
Eric,

Good troubleshooting! Yes it is supposed to be that way. If you look at this thread: Release Notes for 0.8.1, second post...
Quote:
Explanation of the concept of non-managed First NIC:
Qemu and Dynamips do not have a separate management layer.
GNS3 is the only management layer for them. Because VirtualBox has built-in
management layer, people can decide to have a back-door for their own controlled VMs.
This back-door allows admins to manage their VMs in background using first
vNIC - running scripts, doing X11 forwarding, or just have Internet access via NAT. Convenient.
If you don't need this back-door, just disconnect the VBox vCable from vNIC 1. (VM->Settings->Network)

Straight from the developers mouth. I think it does make for a less intuitive UI but I like his thought process.

I don't know if your second question is possible. If you decide to work that one out on your own be sure to let us know though.

Cheers,
Zach


Top
 Profile  
 
 Post subject: Re: Ping problems in GNS3 VBE between VBox and a router
PostPosted: Wed Oct 05, 2011 5:03 am 
Offline

Joined: Tue Oct 04, 2011 4:49 am
Posts: 7
Good to know I wasn't nuts, thanks for the quick response Zach. I'll be sure post anything I find, but don't hold your breath, I'm not much into programming or networking, just a dumb (geriatric) noob.




Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group

phpBB SEO