In an earlier post I took a look at how to setup EVE-NG to get access to virtualized network devices and topologies. This post is going to take a look at how to setup GNS3 systems to allow access.
In the overall topology that is a “home” network sits a device that supports a routing protocol, usually either OSPF or BGP. What is known to work at an inexpensive price point is the Ubiquiti EdgeRouter X.
This post is not a post on how to setup GNS3, it is meant to help you start to access devices. This tutorial is running a GNS3 VM on a remote host. Take a look at the GNS3 docs on how to install GNS3 specifically.
The topology item used to create the connection to the production network is the device type of Cloud. Add a cloud with the general connection and the device will have connectivity to your local network.
Next setup a router (in this instance using a Cisco vIOS image - licensed item). Connect that device to the cloud that was added to the topology. In this particular setup, DHCP is being used.
rtr-edge#show run interface GigabitEthernet0/0 Building configuration... Current configuration : 110 bytes ! interface GigabitEthernet0/0 ip address dhcp duplex auto speed auto media-type rj45 no cdp enable end
With the device getting an address, the device also gets a floating default static route imported to match the DNS request:
rtr-edge#show ip route Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP a - application route + - replicated route, % - next hop override, p - overrides from PfR Gateway of last resort is 192.0.2.1 to network 0.0.0.0 S* 0.0.0.0/0 [254/0] via 192.0.2.1 192.0.2.0/24 is variably subnetted, 2 subnets, 2 masks C 192.0.2.0/24 is directly connected, GigabitEthernet0/0 L 192.0.2.163/32 is directly connected, GigabitEthernet0/0
Verify that you have access to the Internet by using ICMP to test.
rtr-edge#ping 126.96.36.199 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 188.8.131.52, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 13/16/18 ms
By using OSPF you are able to setup networks and advertise them back into your “production”/”home” network. With the network being advertised you can then setup your hosts with addressing that would have access from the network.
It is recommended that you test SSH/API connectivity into the GNS3 environment manually.
Hope that this may help you out in some way!