Questions tagged [gns3]

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

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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?
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1answer
175 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....
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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".
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1answer
189 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 ...
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1answer
4k 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 ...
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1answer
3k 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) ...
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1answer
475 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 ...
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1answer
268 views

Configure switch in GNS3

Is there any way to configure a switch in GNS3?
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2answers
2k 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: ! ! ...
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1answer
461 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/"; ## ...
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1answer
2k 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 ...
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1answer
313 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 ...
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2answers
958 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 ...
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1answer
3k 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 ...
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2answers
297 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 ...
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1answer
1k 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 ...
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2answers
3k 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 ...
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2answers
758 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 ...
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2answers
70 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 ...
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1answer
1k 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 ...
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1answer
547 views

Configuring traffic from certain VLANs to pass through DMVPN [GNS3]

I have the following setup in GNS3: There are other devices to the right, but they are not needed right now. I have a DMVPN configured with Router1 as hub an Routers 2, 3 and 4 as spokes. On the ...
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1answer
414 views

Is there no "mode on" for channel-group in GNS3?

I am using GNS3, and a 3700 as L3 switch (router with ethernet switch module); everything is OK, but when I want to configure two ports as an etherchannel connection, the command channel-group doesn't ...
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3answers
3k views

How to enable DHCP Cisco router

This is what I have done in my GNS3 R3 - Router R4 - Switch I have installed GNS3 and trying to enable on Router as mentioned above depict. How to enabled DHCP on Cisco router R3 ?
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1answer
1k views

GNS3 Latency test

So I have a small topology ( 4 AS ), and I tested it on a real environment (College Lab) with Cisco routers (2000 series). The latency from one point to another was too high when I used GNS3, the ...
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1answer
61 views

Named ACL Configuration

I started a Named ACL Lab today and my configuration is not quite working. LAB: http://gns3vault.com/security/named-access-list/ The first task is creating an ACL which blocks users from NSA's L1 to ...
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2answers
765 views

GNS3 ASA not pinging itself

I have been playing with network stuff so I installed GNS3 network simulator. I have deployed ASA 8.4 image and it has loaded fine. I connected it with basic Switch switch-----ASA I have ...
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1answer
1k views

Wireshark is giving error message while capturing packets from GNS3?

I am trying to capture packets with GNS3 using wireshark but wireshark is giving error message every time I run wireshark in GNS3. Path for Wireshark is "D:\Wireshark\Wireshark.exe". Same Path I ...
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2answers
2k views

How to run a CAM Table Overflow attack in GNS3 using Cisco 3725 routers?

I am currently working on MiTM attacks and defenses in a virtual environment using GNS3 and an IOS c3725 (c3725-adventerprisek9-mz.124-15.T14) image to emulate some topology. The current experiment ...
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1answer
340 views

Could launching a virtual router with less-than-recommened RAM cause interfaces to not initialize?

I'm trying to launch a few vSRX devices through GNS3 (and VirtualBox). The issue that I'm running into (I think) is that my interfaces seem to not properly initialize if I don't start the instances ...
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1answer
2k views

Why do some interfaces not display unless I'm in config mode?

I'm using a Juniper vSRX image in GNS3. Here is my output before entering into config mode: And after entering into config mode: Why can I see my ge0/0/0 in config mode, but not outside of?
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1answer
98 views

Networking 2 Cisco switches on default VLAN 1

Network noob here. I'm trying to get my DHCP server to issue leases across 2 switches using VLAN 1. With GNS3, I have 1 VirtualBox guest running isc-dhcp and 2 Cisco switches running IOS 12.4 in a ...
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0answers
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Cisco router doesn't redirects packets to proxy server - (working on GNS3 with 3600 routers + Ubuntu 14.04 + Squid 3.3) [closed]

My goal is R1 successfully redirects www (port 80) packets to the Proxy1, i already setup the Host3 as Client with gateway 192.168.60.4/24(port fa1/0.60 on R1) i'm working with different VLANs so i'm ...
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2answers
2k views

How to ping default gateway from a pc?

How can I ping the default gateway from PC2? I have tried IP <address> [/<mask>] [<gateway>] command for R1, but is says "not in subnet". And when I tried the same command for R3, ...
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1answer
115 views

Can adjacent AS in BGP run same protocol in IGP?

I am trying to create a BGP simulation in GNS3. I have the following topology Here's what I have understood: R1 will advertise 201.10.10.0 R2 will advertise 203.0.2.0 R3 will advertise 203.0.2.0 ...
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3answers
1k views

Emulate a CISCO PIX Firewall

Is it possible to emulate a CISCO PIX 515 firewall with the software GNS3? Provided I have a working image, of course (that's another topic). Thanks.
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2answers
1k views

Learning Static Route: Is this correct?

In my network journey, I'm studying static routes now (I know that isn't used in large environments, but just studies). I made this topology in GNS3, and I'm wondering if some points are correct. PS:...
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4answers
2k views

GNS3 console speed

Is there any way to change the console speed globally in GNS3. If you have seen GNS3VAULT videos the terminal speed is so fast but I could not find anywhere how to change the speed on GNS3 to get a ...
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1answer
5k views

GNS3: Map the console output of a router on GNS3 to a COM Port (Serial Port)

When a router is configured on GNS3 and started, it is possible to access the console output of the router by right clicking a router -> and then clicking Console I need to be able to map this output ...
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0answers
7k views

Setup the BGP + ospf network

I've the next Lab with GNS3 I have two autonomous systems(100,200), when the AS 100 run a OSPF with two areas, 0 and 1. The AS 200 has only a router and computer, so easy. But I don't know how to ...
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2answers
61k views

GNS3: Configuring/Emulating a Juniper Router on GNS3

I need to be able to emulate a Juniper Router (JunOS) on GNS3. I have seen that this is available as on option in the 'Node Types' list on GNS3. When I try to use this to add a Juniper Router to the ...
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2answers
6k views

Block ICMP ping from a PC to a PC

I have a topology like this PC1 ------Switch PC2 ------Layer --------- Router PC3-------two PC1 192.168.1.34 VLAN 10. PC2 192.168.1.50 VLAN 20. PC3 192.168.1.51 VLAN 20. I configured a router on ...
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3answers
9k views

How to configure PAgP or LACP on GNS3

In gns3, when i configure a router with a NM-16ESW module to use as a switch. And I can not configure PAgP or LACP on this router. It has only one mode ON, and there is no DESIRABLE or AUTO or ACTIVE ...
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3answers
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GNS3: Local install vs Workbench

Does anyone have any experience running GNS3 locally (on Windows or Mac) vs the VM Workbench? I tend to have larger and larger topologies and my 4GB of RAM get pretty loaded... Anyway, can workbench ...

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