Lets forget GNS3.
2G internet is just like a normal wifi modem.
I get a public address, so I dont have to do NAT/PAT.
Its a cellular technology.
The modem connects to the USB connector of laptop.
Its USB modem connected to com9.
Let me know if u need more info.
This video explained me how to do it and it worked.
Its just that I dont know whats the logical topology thats created.
I mean what connects to what.
I see, so your PC gets 18.104.22.168 via 2G dongle directly,
then, your PC does NAT/PAT with MS Internet connection sharing (or whatever they call it in Win 7) and translates public into private range of 192.168.137.x /24.
Because, someone must be doing NAT/PAT in your setting.
You must have MS Loopback set to IP DHCP, right? you could but don't have to.
so your R1 did ping 22.214.171.124 OK but problem is " the ping to other side of the R1 fails"
what do you have on other side of R1 ?
Message was edited by: Martin
See I am a CCNA, so I know a bit of networking
But I really dont have any knowledge about what a MS loopback is.
I will explain what I did and it will be great if you could tell me what topology is created.
I added a MS loopback adapter as suggested in the video and also shared internet to it. When I saw its IPv4 properties, its IP address was set to 192.168.137.1.
I didnt set any DHCP or anything like that.
So, I opend GNS3, added a cloud and configured it as seen in the video.
I added a router, connected it to the cloud using a FastEthernet connection and I gave it the IP address 192.168.137.2.
I was able to ping 126.96.36.199.
So I thought the network topology is like
(GNS3 ROUTER) (192.168.137.2)<--------------------->(192.168.137.1)(MS LOOPBACK)(dont know whta IP address)<------------------->(dont know what IP address)(MY 2G) (188.8.131.52)<--------------------------------------------> ISP
But I was unable to ping 192.168.137.1.
The topology I thought is wrong i think.
Can you clarify what is actually happening and what is the actual network topology ?
just watched video, it is based on or using the Windows Internet connection sharing thing.
So, now if you add some other networks off R1, yo need NAT on R1 (last thing video guy said); this means doing PAT by adding ip nat inside and ip nat outside on interfaces, plus ip nat pool and ip nat source overload.
if you search the forum for NAT/PAT, I am sure you can find some exmaples, even related to GNS3 to Internet connection.
adding to answer your post:
That Internet connection sharing by MS should have special IP range reserved for it, Win 7 look like it is 192.168.137.x/24 (192.168.1.1 for XP).
Your MS loopback has IP of 192.168.137.1. /24;
Your PC gets IP of 200.x.x.x from Internet ISP.
The second NAT/PAT on Router is for whatever is behind Router, like 192.168.1.1
You were able to ping 184.108.40.206 from router because of default route to PC;
Can you tell me what topology is created ?
Topology is simple: R1 <>PC<> ISP or 192.168.137.2<>192.168.137.1<>220.127.116.11
Pings from R1 to 18.104.22.168 were OK because PC is doing PAT translation when you turn Internet Connection sharing on PC. PC knows about directly connected network 192.168.137.x/24. Whatever comes via MS Loopback, gets translated by PC to Public IP.
But if u add another network out of R1, PC does not know about it, so pinging such network will fail.
MS Loopback is tricky, I know. You should be able to ping it from R1. but don't worry if u cannot.
P.S. Check Windows firewall,
gotta go, good luck.
Message was edited by: Martin