Questions tagged [gns3]

For questions about network simulations in the Graphical Network Simulator-3 (GNS3).

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Firewall not reverse translating NAT address in VyOS GNS3

I'm using two VyOS images as Firewalls in gns3, to which I have connected two routers, one from an inside network and another from an outside network. I configured NAT in both for the internal ...
dyxcvi's user avatar
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1 answer
120 views

Site to Site VPN using GNS3

I'm sorry if this a really vague question - but I am trying to get my head around a problem and a possible solution. I'm not really a network guy (not to the depths of you guys) - I'm a PLC ...
Robt800's user avatar
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2 answers
760 views

Simulating Network Infrastructure on GNS3: Switch Stacks and Configuration Challenges

I'm seeking guidance on simulating a network infrastructure using GNS3, specifically focusing on the challenges related to switch stacks. The network environment consists of multiple physical switches ...
wajaap's user avatar
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136 views

L2 connection from the simulation network in GNS3 VM to the physical network

GNS3 VM is used to run GNS3 network simulations. How can I connect from the network in the simulation to the physical network at Layer 2? For example, create a GNS3 environment with the following ...
longer's user avatar
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2 answers
155 views

GNS3 subnetting and routing

I have a project assignment that consists of 3 routers, the ISP, and 2 company routers, the ISP can address a network /24 IPv4. I delegated a /25 to DNS servers and a /26 to one company and 2*/30 to ...
Tiago Oliveira's user avatar
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1 answer
347 views

Cisco Switch vIOS-L2 in GNS3 and CCNA 200-301

I am reading a preparation book for the CCNA Test 200-301. Currently, I am reading a section about DHCP and VLAN interfaces in a switch. The book shows an example of configuring this. switch# ...
Diego Velasco's user avatar
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1 answer
99 views

GNS3 Router Telnet Configuration

I configured the IP address and telnet for my Cisco router but on GNS3 it shows a different IP address. When I ping the router from my Ubuntu virtual machine using the IP address I configured the ping ...
James's user avatar
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1 answer
878 views

How to connect GNS3 to loopback adapter on Windows 10

I'm trying to have a simple topology by connecting a router (c7200) and the local machine which is windows 10. For this I use GNS3 GUI (not the VM application). I have to do that, due to the limit of ...
manula's user avatar
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109 views

Admin IOU L3 switch

Problem with IOU l2 switch By Konstantinos Dimos July 31, 2022 at 3:12 UTC Hi, under Ubuntu 22.04 LTS, gns3 and local server I am trying to manage switch IOU L3 switch, although at the begining I was ...
konstantinos Dms's user avatar
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1 answer
161 views

GNS3 - hosted or VM?

I know that there is a gns3 client that is installed in the operating system. but i see there is a gns3 for vm that gns3 for VM In a few words it is a virtual software to use it with a hypervisor It's ...
Luis Polanco's user avatar
1 vote
1 answer
45 views

What could be the bottleneck of my load-testing case?

I need to bring up a bunch of my devices in the network to hit some other service, for testing purposes. And I have used GNS3 to simulate that. As you may find in my GNS3 project, I have such ...
user3595231's user avatar
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2 answers
528 views

unable to ping loopback interface gns3

I have the following gns3 topology I'm unable to ping R1 loopback interface (destination host unreachable) I'm not sure what is wrong R1 configuration are shown below hostname R1 ! boot-start-marker ...
guest's user avatar
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1 answer
677 views

How to add the Hyper-V Virtual Machine to GNS 3?

I am running GNS3 - 2.2.29 in Hyper V Manager, I installed Windows 10 and Kali Linux VM in Hyper V Manager. I want to add windows 10 and Kali Linux host in GNS3 but no host option in GNS3. Could ...
sjarasan's user avatar
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176 views

How to export a device configuaration in Gns3

I have A Gns3 topology and i try to save my configurations to a txt file in my desktop. I tried the [Tools] > [Import/Export node config] in the menu,[Export configs to a directory] but it only ...
ECHO's user avatar
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RSVP warning: ID "data" is not configured

I am trying to follow this document: https://www.cisco.com/c/en/us/td/docs/ios/qos/configuration/guide/12_2sr/qos_12_2sr_book/config_rsvp.pdf to configure rsvp, using gns3, for Entering Senders or ...
SWETHA CHILVERI's user avatar
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1 answer
105 views

The initial ARP cache for a router that never got a packet

I am trying to understand the ARP cache. So, here is the physical structure of my network: Note that I did not ping any of the PCs yet. So, I expected the ARP cache of the router R1 to be empty. The ...
Seif Ashraf's user avatar
1 vote
1 answer
308 views

ARP sending an ARP request on changing port IP address

Using the c7200 images on GNS3. I configured two routers as so: With arp debugging on, after assigning an ip address I see that each router sends a gratuitous ARP response packet (only debug output ...
Zee's user avatar
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0 answers
631 views

Can ping from VPC 1 to router and VPC2, but can't ping from switch to VPC2 or router

I have a simple, linear topology in GNS3 that goes like this. VPC1 > Switch > Router > VPC2 I have the default static IP Routes on the router set to 0.0.0.0 0.0.0.0 Ethernet0/1 and Ethernet1/...
Dasph's user avatar
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2 votes
2 answers
346 views

Unable to add an abbreviated IPv6 to a Cisco router

I am very new to networking and playing around with GNS3. I am trying to configure a router to have 2 IPv6 addresses in a single interface (as far as I understood, this is possible with IPv6) I ...
Dasph's user avatar
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1 answer
379 views

Two routers connected with a serial line, why they can ping each other without clock rate setting?

I'm pretty new to networking and still learning CCNA stuff. I'm reading a book and as I understand, when you are connecting two routers using a serial line, one router is considered DCE and the other ...
Just a learner's user avatar
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1 answer
1k views

How to Stream from VLC using Multicast? [closed]

I have the following topology: With the following router configurations: R1: hostname R1 ! boot-start-marker boot-end-marker ! ! ! no aaa new-model no ip icmp rate-limit unreachable ! ! ! ! ! ! no ip ...
Rodrigo Pina's user avatar
-1 votes
1 answer
222 views

In gnss3, why can't I ping my cisco router from my VM?

I have the following network, I have never configured a Cisco router before so I'm having a little trouble. In router R1 I used the following commands to assign an ip to the router: configure terminal ...
Rodrigo Pina's user avatar
4 votes
1 answer
187 views

GNS3 switches vs Real switches performance

I want to emulate the performance of switches in GNS3, and the focus is not the configuration of switches. My questions are: Do emulated switches perform worst than actual switches? Are emulated ...
Tabz's user avatar
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1 vote
1 answer
3k views

BGP (RIB-Failure - Higher admin distance)

I tried to make BGP routing on this topology .. After that I added 200.200.10.0 network and 200.200.20.0 network in R1, I had rib-failure (higher admin distance) on R2 and R3 .. but I was able to ping ...
Script Kiddies's user avatar
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0 answers
368 views

Using GNS3 to Sniffing Packets on Siemens RuggedCom RS900

I am using GNS3 to simulate an environment. I have 4 docker containers which all host Python programs. Three of the devices communicate with each other via the programs (Program 1, Program 2, Program ...
logic_bomb_walter's user avatar
1 vote
1 answer
523 views

GNS3 can not ping from ethernet interface to serial interface

So I am doing a Lab for one of my classes involving ipv6 and routing using EIGRP. When I set-up the network and assign the router interfaces with IPV6 address I get an issue pinging the whole network. ...
WoodyTreestump's user avatar
2 votes
1 answer
1k views

Juniper vMX Routers can't ping each other in GNS3

I have a couple of VMX Routers setup in GNS3 that are directly connected on their interface, ge-0/0/2 and they can't ping each other. PFB configuration. I can't seem to find the problem! UPDATE: Added ...
Somenath Sinha's user avatar
-1 votes
1 answer
534 views

Simulation of a large network by GNS3

I want to simulate a large network of 40 routers with GNS3 or OPNET or VIRL or … In the real network, routers route their incoming traffic (coming from an external network) and deliver it to an ...
Ali Ut's user avatar
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0 votes
2 answers
109 views

Setup IPSEC in Hub/Spoke fashion

I'm trying to setup IPSEC tunnels in a hub/spoke type fashion. I've emulated this in GNS3 by creating three sites. Each site uses an IOSv router as it's WAN router. I'm using site 2 as the hub and ...
dutsnekcirf's user avatar
0 votes
1 answer
2k views

Simple VyOs Static Routing on GNS3

Sorry for the beginner question. I'm trying to simply set up static routing on this GNS3 topology. Specifically, I want Sam to be able to ping Jack. I've assigned all of the VPCS machines ip's, and ...
Doe's user avatar
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1 vote
1 answer
67 views

ipv6: I can ping only 1 interface within same network even with static route

This is how I set up a static route. R1(conf): ipv6 route 2004:DB8:2233:23::/64 2001:DB8:1122:12::2 With this, I can ping to 2004:DB8:2233:23::2 (S2/2 on R2) but not to 2004:DB8:2233:23::3 (S2/2 on ...
Filip's user avatar
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1 vote
1 answer
449 views

Connect routers in gns3

I have a topology of three routers connected with each other. The problem is that it has a different network address on two directly connected ports of router R1 and R2. So I am not able to ping R1 ...
Researcher's user avatar
0 votes
2 answers
1k views

Do switches need any configuration?

I created a testing gns3 project. When I click "console connect to all nodes", only connections to routers and vpcs were created. Why no connections to these switches? Does that mean switches don't ...
Just a learner's user avatar
1 vote
0 answers
1k views

Connecting GNS3 Topology to the Internet

I'm trying to connect my small topology to the internet through the Cloud device, but I'm not able to connect to even my own desktop's IP from the virtual router I have. I have Windows Defender rules ...
William Reed's user avatar
0 votes
1 answer
62 views

building a project for my final year project course

i'm building this project for my final year project course. here,there is a cloud and all ports are bridged..and nearest router has taken IP from cloud over dhcp. r1,r2,r3 are contact with their ...
tamjidul islam's user avatar
0 votes
1 answer
57 views

Can't access services on my other IP on same network interface GNS3 and Host [duplicate]

I have one physical NIC that is assigned an IP address (10.14.255.240). Inside of GNS3 network simulation tool, I also have a another 'virtual' interface with another ip address (10.14.255.245). Both ...
nametable's user avatar
1 vote
0 answers
764 views

Cisco FMC stuck on boot menu screen on eve-ng

Any time I restart Cisco FMC on eve-ng, it doesn't boot the default image. When I connect via VNC and press enter or type the image version to boot, it doesn't respond to laptop keystrokes . I was ...
gnome247's user avatar
0 votes
1 answer
297 views

VirtualBox "Bridged" network analog in GNS3?

There is "Bridged adapter" network solution in VirtualBox when your virtual machine gets IP-address from your real physical router (like 192.168.1.62). Is there a similar thing in GNS3 (on Linux ...
DenisNovac's user avatar
1 vote
2 answers
802 views

Difference between various network simulators

What are the main differences between GNS3, Cisco Packet tracer and EVE-NG? Detailed explanations would be appreciated.
NisaarDeenAzeem's user avatar
3 votes
1 answer
2k views

GNS3 Routers - what is the difference beteween line con 0, line aux 0, and line vty 0 4?

Totally new to this and am not sure what the difference between them are. Can anyone explain this to me in simple terms??
pete's user avatar
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2 votes
1 answer
4k views

Duplex mismatch between a Fast Ethernet router and Gigabit Ethernet switch with auto negotiation

i am connecting c3745 router on fast ethernet 0/0 interface with a IOSvL2 switch on gigabit ethernet 0/1 on GNS3. i have set the negotiation on the switch to auto for all interfaces on the switch. ...
mouhammed saieed's user avatar
0 votes
1 answer
32 views

ACL and ACEs Query

So i'm configuring a basic network and I need to create a couple of Extended ACLs. Now my question is, does this ACE permit any TCP connection to the following subnet? permit tcp 192.168.10.0 0.0.0....
user avatar
2 votes
1 answer
11k views

If traceroute fails why does ping still work?

If I can ping a router successfully, why is it that when I do traceroute, it stops at a particular interface and says "ICMP type:3, code:3, Destination port unreachable". Doesn't that mean that it can'...
Kuni_Leqa's user avatar
2 votes
1 answer
91 views

Need help to replicate the results of a tutorial on Frame Relay Configuration on Router. What do I need to change/add?

I'm having trouble getting the output shown at 03:14 here: Frame Relay configuration by Kevin Wallace My Network is 3 routers, each connected to the frame relay switch via Serial2/0 interface, with ...
Somenath Sinha's user avatar
2 votes
2 answers
5k views

Is "Host unreachable" the same as "Communication administratively prohibited" in Access List ping response?

Below is a portion of my topology. Faculty of Arts student subnet should not be able to ping Faculty of Arts staff subnet but the staff should be able to ping the student subnet. I know that this ...
Kuni_Leqa's user avatar
2 votes
1 answer
151 views

How to make PCs in the same LAN but on different networks communicate

Is it possible to ping PCs in the same LAN but on different networks? I've done RIP version 2 on all the routers. They all can ping each other. However, the PCs cannot. For example, when I try to ping ...
Kuni_Leqa's user avatar
5 votes
2 answers
212 views

Carrying remote VLAN via 2 routers to the local gateway

I have a serverA (192.168.15.1) from site A and VLAN is 15, however the VLAN 15 gateway is set at site B (192.168.15.254). There are two ISP routers as a metro role to connect each other by subnet ...
eoeoke's user avatar
  • 65
-1 votes
1 answer
843 views

Can't save configration in router(gns3 )

I have installed gns3 v2.1.9 with gns3 vm(oracle v5.2.18) in my Ubuntu 64bit v18.04. I have installed 2 routers 3725 and 3745 in gns3 vm. But if i try to save my config with copy running-...
Owais Qureshi's user avatar
4 votes
1 answer
92 views

Why switch has records in mac-table when i just set ip address to the hosts which connected to the switch?

I created a new switch and connected to two hosts in GNS3.Like this: Host1--->LS<---Host2, i think the mac-table in the switch should be empty before i sent data between two hosts. But when i just ...
sky's user avatar
  • 179
1 vote
1 answer
822 views

GNS3 IP helper in Multiple Vlans

Good day everyone, I'am having trouble getting VPCs from VLAN 3 to communicate with the DHCP on Vlan 3 I've also tried configured IP helper on the Router but to no avail. Router Configuration dump ...
Z3R0_XP's user avatar
  • 13