Questions tagged [gns3]

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

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Gns3 overriding network adapter removes hard drive [closed]

Hello dear network engineering users, I am trying to set up a test system on gns3 where one machine is xubuntu and other one is another linux distro; gns3 base vm works fine on vmware I am using ...
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1answer
46 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 ...
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1answer
36 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 ...
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45 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/...
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2answers
64 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 ...
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1answer
38 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 ...
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1answer
157 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 ...
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1answer
41 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 ...
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1answer
137 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 ...
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1answer
751 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 ...
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78 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 ...
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1answer
87 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. ...
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1answer
464 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 ...
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1answer
128 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 ...
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2answers
46 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 ...
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1answer
423 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 ...
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1answer
40 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 ...
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1answer
68 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 ...
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2answers
35 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 ...
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0answers
885 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 ...
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1answer
52 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 ...
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1answer
35 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 ...
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0answers
313 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 ...
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1answer
151 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 ...
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2answers
493 views

Difference between various network simulators

What are the main differences between GNS3, Cisco Packet tracer and EVE-NG? Detailed explanations would be appreciated.
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1answer
736 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??
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1answer
2k 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. ...
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1answer
30 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....
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1answer
8k 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'...
2
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1answer
65 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 ...
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2answers
3k 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 ...
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1answer
116 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 ...
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2answers
208 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 ...
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1answer
608 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-...
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1answer
83 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 ...
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1answer
618 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 ...
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1answer
2k views

Is it possible to emulate ARUBA device in GNS3 environment?

Is it possible to emulate ARUBA device in GNS3 environment?
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1answer
129 views

Sending image files using GNS3

I had built a network using GNS3, this network contains a lot of routers, the problem is: I want to send an image file between these routers using GNS3 is there any way to do that?
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2answers
2k views

How to make virtual devices on GNS3 be able to ping the physical host

I have had this problem already and figured out its reason. Basically the problem is that the virtual devices on GNS3 cannot ping the physical host and also the physical host cannot ping the virtual ...
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2answers
4k views

Virtual devices on GNS3 cannot ping the physical host

On GNS3 I have developed the following network: The enp2s0f2 is my own computer network interface. The router R1 configuration is shown below: R1#show running-config Building configuration... ...
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3answers
4k views

Configuring OSPF on two directly connected routers which are in different areas

I want to configure OSPF on the topology below. The problem is when I connect two routers to each other and when I config one router to area 0 and another one to area 1, they don't see each other as ...
2
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1answer
762 views

GNS3: No Response When Pinging Router Connected on Second Serial Interface

I'm attempting to set up a network with 3 Routers. A "West" and "East" router are each connected to a "Central" router via a PA-4T+ serial interface. The first interface (s1/0) on the Central is ...
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1answer
1k views

GNS3 wic vs slot

can any one explain the difference between WIC vs Slot? plus I want to have more L3 links in GNS3 but I cannot have more than 4 on 3725 router. there are two built in plus i can add two NM-1FE-TX in ...
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2answers
1k views

ASA cannot ping outside through NAT on border router

I have the following topology below, in GNS3. Basically, the cloud NAT-1 is the Internet, R1 is my border router with NAT and FWASAv-1 was supposed to be able to access the Internet, but can't. I ...
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2answers
234 views

PBR does not work on incoming interface, but works on outgoing subinterface

This lab is on Dynamips. I have a PBR configured on R6 which lets a packet from SW1 lo0 heading to the even ones of R1 lo1 go through R4 and a packet from SW1 lo0 heading to the odd ones through R5. ...
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1answer
204 views

Should I always use "no ip address" command?

I'm studying networking and GNS3. In every example I see that before configuring an IP (IPv4 or IPv6) address of an interface, there is always the command "no ip address". Why they write this command? ...
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2answers
3k views

GNS3 - Connected to Dynamips VM “R1” (ID 1, type c3600) - Console port Press ENTER to get the prompt

I am using windows 10 and I tried to open router console in gns3 and get this massage in console window(Connected to Dynamips VM "R1" (ID 1, type c3600) - Console port Press ENTER to get the prompt) ...
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1answer
1k views

GNS3 - Cisco router doesn't forward packets to different subnets

My network looks like this: For some reason there's no connectivity if I ping the machine named Server_TFTP from any of the Hosts. The router does however respond to pinging it. Apparently there's no ...
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2answers
1k views

GNS3 - configure two DHCP servers within one VLAN

I have the following configuration: I would like to provide every host from VLAN_101 with DHCP-provided IP addresses. There are two DHCP servers running - one grants adresses for every host below ...
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2answers
1k views

Simulate a real L3 WAN with VIRL or GNS3 (+/- VIRL images)

I would like to simulate or emulate the design of a replacement network which will be L3 routed (the easy part) but will have a lot of simultaneous L2 VLAN bridging (or tunnels) to accommodate the ...