Comments for joshatterbury.com - CCIE #23347

Comment on Part 1 of Dynamips External Cloud Interface on Linux by Farhan

Farhan — Wed, 09 Nov 2011 04:16:49 +0000

1st Thanks for the great post.
I follow the instruction its work well but when I connect cloud tap0 interface to the Router I got dynamips error, it says “206-unable to create TAP NIO”.

I change the user of tap interface to root, also change the permission “sudo chmod 777 /dev/net/tun* ” to this but no result.

Could you tell me what I’m doing wrong? Please Help.

Comment on Part 2 of Dynamips External Cloud Interface on Linux by Willie

Willie — Sun, 28 Aug 2011 10:54:35 +0000

Thank you, was about to switch back to windows gns3 until seeing this post.

Really appreciated.

Comment on Tutorial: Part 1 of Ultimate Dynamips Dynagen config - focusing on start on boot with Terminal Servers by Praveen

Praveen — Thu, 23 Jun 2011 03:57:48 +0000

hi joshatterbury.com

such a nice and useful post but i am new in dynagen and i want to learn it my problem is i don’t know linux so would you teach me this how to setup rack lab in windows what u tell here in very concise and if possible visual way i hope u will help me to learn this i will wait for your reply please brother i really need to learn this in windows 7.

Comment on Part 1 of Dynamips External Cloud Interface on Linux by Juanlu

Juanlu — Fri, 17 Jun 2011 17:40:19 +0000

Hi,

I have configured folow your steps:

# brctl addbr br0
# ip l s dev br0 up
# tunctl -t tap0 -u juanlu
TUNSETIFF: Device or resource busy
# ip l s dev tap0 up
# brctl addif br0 tap0
# brctl addif br0 wlan1
#
# brctl show br0
bridge name bridge id STP enabled interfaces
br0 8000.00e04c04a085 no tap0
wlan1
# ifconfig wlan1 0.0.0.0 promisc
# dhclient br0
Internet Systems Consortium DHCP Client V3.1.1
Copyright 2004-2008 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

wmaster1: unknown hardware address type 801
wmaster0: unknown hardware address type 801
wmaster1: unknown hardware address type 801
wmaster0: unknown hardware address type 801
Listening on LPF/br0/00:e0:4c:04:a0:85
Sending on LPF/br0/00:e0:4c:04:a0:85
Sending on Socket/fallback
DHCPDISCOVER on br0 to 255.255.255.255 port 67 interval 3
DHCPDISCOVER on br0 to 255.255.255.255 port 67 interval 4
DHCPDISCOVER on br0 to 255.255.255.255 port 67 interval 11
DHCPDISCOVER on br0 to 255.255.255.255 port 67 interval 18
DHCPOFFER from 192.168.1.1
DHCPREQUEST on br0 to 255.255.255.255 port 67
DHCPACK from 192.168.1.1
bound to 192.168.1.136 — renewal in 1462 seconds.
# route add default gw 192.168.1.1
#

Now, these are my interfaces:

# ip a
1: lo: mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 brd 127.255.255.255 scope host lo
inet 127.0.0.2/8 brd 127.255.255.255 scope host secondary lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: mtu 1500 qdisc pfifo_fast state DOWN qlen 1000
link/ether 00:23:54:2d:53:3e brd ff:ff:ff:ff:ff:ff
3: wmaster0: mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
link/ieee802.11 00:e0:4c:04:a0:85 brd ff:ff:ff:ff:ff:ff
4: wlan1: mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:e0:4c:04:a0:85 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.136/24 brd 192.168.1.255 scope global wlan1
inet6 fe80::2e0:4cff:fe04:a085/64 scope link
valid_lft forever preferred_lft forever
5: wmaster1: mtu 1500 qdisc noop state DOWN qlen 1000
link/ieee802.11 00:22:5f:35:23:02 brd ff:ff:ff:ff:ff:ff
6: wlan0: mtu 1500 qdisc noop state DOWN qlen 1000
link/ether 00:22:5f:35:23:02 brd ff:ff:ff:ff:ff:ff
13: tap0: mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 500
link/ether 8a:fb:25:0e:93:1b brd ff:ff:ff:ff:ff:ff
inet6 fe80::88fb:25ff:fe0e:931b/64 scope link
valid_lft forever preferred_lft forever
14: br0: mtu 1500 qdisc noqueue state UNKNOWN
link/ether 00:e0:4c:04:a0:85 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.136/24 brd 192.168.1.255 scope global br0
inet6 fe80::b860:e5ff:fe12:2368/64 scope link
valid_lft forever preferred_lft forever
#

I make a ping from my PC to gw and result is successfully:

# ping 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=1.60 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=1.36 ms
64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=3.75 ms
^C
— 192.168.1.1 ping statistics —
3 packets transmitted, 3 received, 0% packet loss, time 2006ms
rtt min/avg/max/mdev = 1.365/2.238/3.750/1.073 ms

Im ake a pig from my PC to my virtual router GNS3 and the result is sucessfully too.

# ping 192.168.1.2
PING 192.168.1.2 (192.168.1.2) 56(84) bytes of data.
64 bytes from 192.168.1.2: icmp_seq=1 ttl=255 time=2.54 ms
64 bytes from 192.168.1.2: icmp_seq=2 ttl=255 time=1.66 ms
64 bytes from 192.168.1.2: icmp_seq=3 ttl=255 time=3.50 ms
^C
— 192.168.1.2 ping statistics —
3 packets transmitted, 3 received, 0% packet loss, time 2008ms
rtt min/avg/max/mdev = 1.663/2.571/3.506/0.753 ms

My ARP table is ok:

# arp
Address HWtype HWaddress Flags Mask Iface
192.168.1.2 ether cc:0f:1d:0e:f0:01 C br0
192.168.1.1 ether 64:68:0c:83:83:0b C br0

My problema is this. From my virtual router GNS3 i can ping to my PC but i can not ping to my default gw 192.168.1.1.

i resolve arp in GNS3 router the ip of gw. It is very strange.

Any can i help me???. Me and I can only think jumping out the window.

Sorry my english
Kind regards
JL

Comment on Part 1 of Dynamips External Cloud Interface on Linux by Thibault

Thibault — Thu, 16 Jun 2011 00:06:24 +0000

great tutorial the first that really works throughout,

congratulations and thanks

on top of that there is no need to run GNS3 in root mode great

thanks a lot

Comment on Part 1 of Dynamips External Cloud Interface on Linux by Michal

Michal — Thu, 28 Apr 2011 00:11:45 +0000

Hello.
Thanks for great tutorial - without that i’d never worked out how to connect LAN to GNS3 router on Linux using cloud interface.
However based on your tut, i’ve found alternative (in my opinion shorter and better) way to accomplish that. Instead of bridging virtual tap interface with your ethernet device, setting an ip address to 0.0.0.0 on ethernet device and running dhclient on new created bridge, you can only create the virtual interface (the same way you create it in tutorial), then assign it an ip address and set forwarding between the interfaces on your linux machine.
The last thing is done by:
echo ‘1′ > /proc/sys/net/ipv4/conf/all/forwarding.
Then you can attach your virtual interface to the cloud and enjoy connecting dynamips to your LAN without any bridging between interfaces.
Thanks for this great tut once more!

Comment on CCIE SP Technology Workbooks by Rajeev

Rajeev — Wed, 02 Feb 2011 13:39:40 +0000

Awesome .. Thank you.. how about giving next

1.MPLS Te
2. ATOM

Comment on Part 2 of Dynamips External Cloud Interface on Linux by Gunner

Gunner — Tue, 25 Jan 2011 20:41:24 +0000

How do you get this to work with multiple NICs? I have a 4 port card and I want to bridge br0 (tap0 & eth0), br1 (tap1 & eth1) etc.

My aim is to fit several quad cards to the PC so that I can bridge many router interfaces to external switches. Am I missing something with the scripts? I have the following in ‘config’:

HOST_IF=”eth0″
HOST_SETUP=”dhcp”
HOST_IPADDR=”
HOST_GW=”
DYNA_USER=”user1″
TAPS=”tap0″
HOST_IF=”eth1″
HOST_SETUP=”dhcp”
HOST_IPADDR=”
HOST_GW=”
DYNA_USER=”user1″
TAPS=”tap1″
.
etc etc…..
.
TAPS=”tap4″

“brctl show” has br0 with eth4 & tap4 assigned.

I’m running Ubuntu 10.10

Many thanks.

Comment on Part 2 of Dynamips External Cloud Interface on Linux by Bowo

Bowo — Tue, 14 Dec 2010 02:37:58 +0000

Thanks very much for your work.
It’s mean so much to my research plan.

One problem is, what if I had multiple NIC and I want to connect it all to my GNS3 project? Can I just add it all at config file?

Many thanks before.

Satriyo Wibowo
- beginner -

Comment on CCIE SP Technology Workbooks by Rajinder

Rajinder — Mon, 22 Nov 2010 21:32:49 +0000

Really You are very great,, your labs really help mea lot,,, keep posting buddy.. God Bless you!!!1