I have created the following Network in GNS3 GNS3 Simple Network Diagram.
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 can telnet and ping from any remote host in my LAN.
R1 also configured with SNMP access (public community string)
The IP for R1 routers' F0/1 interface is manually configured. This interface i can ping from any remote host on my LAN however Telnet fails.
R2 routers' F0/0 ip is manully configured. The situation is same here, where i am able to ping however telnet is failing. All the configuration is same between R1 and R2.
Just mentioning again, all the interfaces are ping-able from any Remote Host in the same LAN, however only R1's F0/0 is telnet-able (hope that is a word)
Is there some configuration change that i can do to get telnet access to all the interfaces?
Related
I have a java program that uses SQL queries. The goal is to send them from my home PC to a workstation on a different network elsewhere.
The SQL server is on Windows Server and I opened port 1433 for inbound connections. From that computer, I can successfully ping the port. However, I can't ping the port from the public ip address, only the local (192.168...), so it doesn't work if I were to try to ping it from my home computer.
Is there a way that I can ping it from my home computer? If so, how would I specify the address for JDBC?
Thanks!
It sounds like your Windows Server is behind an internet gateway/router. You need to configure the gateway to allow and forward inbound connections to TCP port 1433 to the IP of the computer that has SQL Server installed.
Here are some guides that explain how to enable port forwarding on different devices:
How to Forward Ports on Your Router (lifewire.com)
How to Port Forward (No-IP.com)
Also, note that we can ping IP addresses, not ports.
I would like to connect the remote machine to my local VPN and then ssh to that remote machine from the other machines in my local network.
Is this possible? Will the remote machine get new IP which will be visible in my local network? Do I need to configure anything manually?
I'm using FortiClient for VPN.
Yes this is absolutely possible. Try Following steps
1-Deploy VPN and assign the ipranges in DHCP public or private
2-Make Sure to turn off the firewall for vpn server for now
3-Turn off the Clients Firewall
4-Connect to VPN
5-If your connection loose try to see the client's IP from server
side and try to take SSH
6-Take ssh from your server
7- Ping the server from other local machines
8-Then enable the server side firewall and see the effect if ssh is
still possible if not make a rule for specific port for ssh
I'm having problems SSH'ing between ESXi guests that are on different hosts within the cluster. I've one guest that is on the routable cluster virtual network that I am using as a bastion server to access guests on a private network - the distributed port group spans all hosts.
I'm using SSH ProxyJump to route through the bastion host to the other guest VM's. When the guests on the private network are on the same cluster host as the bastion there is no problem. When the guests are on a different host, I get a connect refused by the remote server error. If I manually migrate the VM to the same cluster as the bastion, the error goes away.
I found this answer which relates to SSH'ing between ESXi hosts, not guests on hosts, and suggests that SSH Client needs to be allowed on the outgoing firewall of each host. It seems like it could be relevant, but my vSphere knowledge is limited and I don't have sufficient admin rights to make this change myself.
I'd be grateful if anyone could confirm if my inability to SSH between guests on different hosts is as a result of not having SSH Client enabled in the outbound firewall or if there is some other reason why I can't get an SSH connection?
From the link you posted:
You need to open the required ssh ports in the ESXi firewall.
In the vSphere Client check the host -> Configuration -> Security Profile -> Firewall -> Properties
and enable "SSH Client" if you need outgoing scp connections resp. "SSH server" if you want to enable incoming scp connections.
Instead of opening SSH client for outgoing firewall of each host, please configure it this way:
Outgoing Server Receiving Server
SSH Client -> Outgoing firewall -> Incoming firewall -> SSH Server
It was an underlying network issue - physical switch was dropping my VLAN tagged packets as VLAN ID wasn't configured on it.
I am working on a project consisting of the bidirectionnal (and secure) connexion of a lot of Raspberry PI -N clients- to a known, accessible, fixed-IP adress Server.
The clients (Raspberry PI) are all connected to the Internet via a classic NAT. Let say clients are identified by a number between 1 and N.
[Client] Raspberry PI <-> NAT (Internet Provider) <-> Internet
All client's public IP are dynamic
The Server is located somewhere on the Internet at the IP address A
--- My GOAL : Connect each client to the server with the SSH protocol. ---
The Server needs to send data at will to any client (no broadcast), and each client needs to send data to the server.
There will be "N" SSH tunnels, initiated by the clients , using reverse-port forwarding or/and port forwarding.
That's where i lack knowledge in SSH:
1) How can the server associate each tunnels with a client in
order to be able to use the proper tunnel ? How can a program (for
example in C) identify and "use" each tunnel for sending and receving
server-side?
2) Using [reverse] port forwarding, what are the needs in ports
server side, does each clients needs a remote port on the server?
3) Do i need to create a program that link each outgoing port to a
client ID and same thing for ingoing port?
My problem is when the server needs to send data to a specific client, how to do it ?
Thank you very much.
i have an ibm server, a tp-link router with an static ip and DHCP activated, i want to configure one of the net boards in the ibm server.
I installed Ububntu server and access to the net board configuration using this command:
vi /etc/network/interfaces
I configure the server with this
address -> i put an ip that i resrve in the router
netmask
network
broadcast
gateway
I have a subdomain from no ip i have entered in the server so i can do remote connection to the server throw this subdomain and ssh. I have put the subdomain in /etc/host.conf
The thing is i have access to the subdomain in the web and out of the LAN net. But when i try to connect to the server throw ssh it's gave me connection refused.
EDIT:
Using the command arp-scan -I eth0 -l i found that the IP of the server is asigned two times it's look like it's the same ethernet board with two MAC address thar are the same except the las number.
Ok, what's work for me was to reinstall openssh on the server and in my computer. After that I have access throw ssh.