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 Post subject: IPv6 duplicate address when connecting a router to a cloud
PostPosted: Thu Jan 30, 2014 7:33 am 
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Joined: Tue Jan 28, 2014 7:43 am
Posts: 3
Hi all,

I encountered a problem when trying to connect several routers (3640, 3745, 7200) to a cloud that is attached to my LAN adapter.

Just some background: I am running GNS3 0.8.6 on Windows7-64bit and on WinXP-64bit and the same problem occurs on both platforms.

Here is the very simple configuration I tested with a topology of cisco 3640(Fa0/0)<>Cloud:
Code:
R1(config-if)#do sh run
Building configuration...

Current configuration : 710 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
no aaa new-model
memory-size iomem 5
!
ip cef
no ip domain lookup
ip domain name lab.local
!
ipv6 unicast-routing
ipv6 cef
!
interface FastEthernet0/0
no ip address
duplex auto
speed auto
ipv6 address 2001::1/64
ipv6 enable
!
no ip http server
no ip http secure-server
!
control-plane
!
line con 0
exec-timeout 0 0
privilege level 15
logging synchronous
line aux 0
exec-timeout 0 0
privilege level 15
logging synchronous
line vty 0 4
login
!
!
end


As you can see above, there is nothing special about it.

As soon as I enabled interface fa0/0, I got the following notification:
Code:
R1(config-if)#ipv6 address 2001::1/64
R1(config-if)#no shut
R1(config-if)#
*Mar  1 00:00:56.279: %IPV6-4-DUPLICATE: Duplicate address FE80::CE03:18FF:FEFC:0 on FastEthernet0/0
R1(config-if)#
*Mar  1 00:00:57.231: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up
*Mar  1 00:00:58.231: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up


Needless to say that changing the MAC address to any other value didn't help.

Furthermore, I found that the router could not really communicate with other IPv6-network elements beyond that cloud

Is this a known issue?

Your reference will be greatly appreciated!




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 Post subject: Re: IPv6 duplicate address when connecting a router to a clo
PostPosted: Thu Jan 30, 2014 6:11 pm 
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Site Admin

Joined: Sat Oct 11, 2008 1:41 pm
Posts: 2668
Location: Canada
Hi,

Is the cloud bound to a Windows Loopback interface or your physical network card?

_________________
Jeremy, GNS3 Programmer & Benevolent Dictator for Life.


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 Post subject: Re: IPv6 duplicate address when connecting a router to a clo
PostPosted: Thu Jan 30, 2014 6:34 pm 
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Joined: Tue Jan 28, 2014 7:43 am
Posts: 3
Hi grossmj,

The cloud is bound to my physical network card.

If any additional info is needed, just let me know

Thanks


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 Post subject: Re: IPv6 duplicate address when connecting a router to a clo
PostPosted: Tue Feb 04, 2014 4:52 am 
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Site Admin

Joined: Sat Oct 11, 2008 1:41 pm
Posts: 2668
Location: Canada
Hi,

Well, I would give the Windows loopback interface + bridging solution a try. Sorry I cannot point you to an HOWTO right now but I am sure you will find many using Google.

_________________
Jeremy, GNS3 Programmer & Benevolent Dictator for Life.


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 Post subject: Re: IPv6 duplicate address when connecting a router to a clo
PostPosted: Tue Feb 04, 2014 7:34 am 
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Joined: Tue Jan 28, 2014 7:43 am
Posts: 3
That worked perfectly!!

Thank you!!




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