Questions tagged [gns3]

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

Filter by
Sorted by
Tagged with
-2
votes
0answers
20 views

Problem with GNS3 cloud (Pc's network adapter)

I want to connect a router in gns3 with a loopback network adapter (present on host/pc) Earlier(2 weeks back) when i was using it it was working fine, but now when i am opening the same project the ...
-1
votes
1answer
23 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 ...
0
votes
0answers
36 views

GNS3 Not working after upgrading ubuntu 19.04

I upgraded Ubuntu 18.04 to 19.04 and GNS3 stoped starting. in CMD this Message appears sudo gns3 Fail update installation: No module named 'sip' Can't import Qt modules: Qt and/or PyQt is probably ...
1
vote
2answers
54 views

Difference between various network simulators

What are the main differences between GNS3, Cisco Packet tracer and EVE-NG? Detailed explanations would be appreciated.
2
votes
1answer
48 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??
2
votes
1answer
141 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. ...
0
votes
1answer
21 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....
2
votes
1answer
1k 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
votes
1answer
45 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 ...
2
votes
2answers
539 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 ...
2
votes
1answer
91 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 ...
5
votes
2answers
193 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 ...
-1
votes
1answer
240 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-...
4
votes
1answer
76 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 ...
1
vote
1answer
347 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 ...
2
votes
1answer
1k views

Is it possible to emulate ARUBA device in GNS3 environment?

Is it possible to emulate ARUBA device in GNS3 environment?
-1
votes
1answer
73 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?
0
votes
2answers
907 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 ...
3
votes
2answers
2k 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... ...
5
votes
3answers
2k 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
votes
1answer
474 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 ...
1
vote
1answer
645 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 ...
2
votes
2answers
493 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 ...
1
vote
2answers
156 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. ...
3
votes
1answer
89 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? ...
0
votes
2answers
1k 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) ...
2
votes
1answer
579 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 ...
1
vote
2answers
598 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 ...
1
vote
2answers
752 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 ...
2
votes
1answer
260 views

GNS3 nat configuration issue

I'm studying for my CCENT exam, and I'm trying to practice configuration of the NAT. R1 configuration: Building configuration... Current configuration : 1211 bytes ! version 12.4 service timestamps ...
0
votes
2answers
1k views

How to save gns3 configurations in Ubuntu?

I am using Ubuntu 16.04 and I want to save my host configurations. I have assigned my hosts ip addresses but when I close gns3, the configurations are discarded. How to I save configurations?
1
vote
1answer
109 views

Router 1 doesn't learn the routes

Hello, I've activated rip on all 3 routers with version 2 but R1 fails to ping R3 and vice versa. I've configured the vlans of the switches with their ips. I've been try a while now to get this fixed....
1
vote
2answers
52 views

Can i use an actual network management application and connect it to a router inside GNS3?

I want to connect a NMS to a router on GNS if it's possible, so that i can practice the "actual thing".
2
votes
1answer
155 views

Is it possible in a AS with full-mesh topology to use an iBGP route instead the directly connected route?

iBGP needs a full-mesh topology which means all the routers need to be directly connected each other. Does that mean the BGP attributes that we configure in iBGP, such as weight, will not have any ...
1
vote
1answer
3k views

How to connect two networks via Cloud in GNS3?

I have these two networks in GNS3 I am working on for a lab. I want to be able to connect R7 to the cloud and R30 to the cloud and have them communicate with their static IPs and be able to ping ...
2
votes
1answer
2k views

Can't ping between 2 CE routers even though routes exist in vrf routing table

I checked the vrf routing tables and the CE's network is present but I cannot ping it from anywhere. I will provide the PEs' configuration files and the CEs'. Any ideas? PE1 configuration file(R2) ...
2
votes
1answer
403 views

GNS3 v2 router to host connection

I'm trying to make a router inside GNS3 to connect to the host device (a Debian 8) with no success. Am I missing something? DHCP works as expected: ! interface FastEthernet0/0 ip address dhcp ...
1
vote
1answer
182 views

Configure switch in GNS3

Is there any way to configure a switch in GNS3?
1
vote
2answers
1k views

BGP problems, cannot ping

I'm beginner, and I have problems with BGP. I don't really understand why it doesn't work correctly. This is my topology: I need to ping from R8 to R10. This is the configuration of R8: ! ! ...
1
vote
1answer
373 views

How to set DHCP with VLANs on vSRX (GNS3)?

I tried set DHCP on my host, but it can't find the DHCP server. What am I supposed to do? system { root-authentication { encrypted-password "$1$AZZi5zCr$CoHgrnTOOXUpyaCJm3XLn/"; ## ...
2
votes
1answer
1k views

How to connect two Juniper gns3 with fastethernet?

I need to connect two Juniper routers with fastethernet interface. When I am connected by em0, I can check the connection between them by ping. But when I tried to set fe-0/0/0 in two routers, I can't ...
1
vote
1answer
264 views

Which one of juniper routers image gives me this option (GNS3)?

I need to create the same network with cisco and juniper routers. I find tutorial to cisco. When i clicked on configuration in cisco router i have a lot of options for example WICs, its emulated by ...
1
vote
2answers
649 views

GNS3 - Telnet issue

I have created the following Network in GNS3 Let me explain the SetUp: The internet cloud Cloud 1 is connected to my LAN and not loopback. R1 routers' F0/0 is getting the IP from DHCP, to which i ...
1
vote
1answer
2k views

Having 24 gigabit ethernet ports cisco switch in gns3

I need a 24 port gigabit ethernet cisco switch with 2 fiber ports in gns3. An example of this switch is the Cisco SGE2000 switch, i found out that the gns3 only provides only their default etherswitch ...
0
votes
2answers
188 views

Should a PC populate his ARP table when a frame is not destined to it?

I made this topology in GNS3 : I cleared the switches MAC tables. In this way, when PC1 sends an ARP request to know who has the IP 192.168.1.20 (PC2 IP), the request is broadcast through all ports ...
2
votes
1answer
829 views

Problem in routing the network in GNS3

Can someone please help me: Cloud 5 is configured with a loopback adapter on my PC with ip 10.84.104.254. R1 F0/1: 10.84.104.1 i am able to ping R1 F0/1 from outside, as well as I can ping and do ...
1
vote
1answer
2k views

How to assign multiple VLANS to a port?

I have a simple question about a network (I am new to this concept so please correct me if I am wrong). I have a simple network as shown (GNS3): The network have 3VLANS (VLAN10 = DesignTeam, VLAN30 ...
1
vote
2answers
602 views

/23 IP Space Allocation in GNS3

I am trying to allocate 256 IP addresses to Subnet1, 128 IP addresses to Subnet2 and 128 addresses to Subnet3 using the IP address 120.130.10.0/23 What I have setup in GNS3 is a router connected to 3 ...
1
vote
2answers
56 views

OSPF and addressing problem

I'm currently practicing setting up an MPLS VPN using GNS3. Here is the topology i have: I need to, on all P and PE routers enable OSPF routing protocol advertising all inside networks . From PE1 ...
1
vote
1answer
733 views

Real IP phone in GNS3 Problem

I am trying to link this configuration to a real SPA 303 IP phone but I do not know where to begin with this. I have the physical IP Phone, but I want to run it through the simulated environment that ...