I am running an Ubuntu server with my laptop through an Orcale VirtualBox and I try to maximize the bandwidth of my home server, as it really slows down my internet connection. My router supports up to 300Mbit upload/download speed and my laptop wifi's card up to 150bit.
I configured my server with the following(static IP, configured by vim /etc/network/interfaces):
auto eth0
iface eth0 inet static
address 192.168.1.240
netmask 255.255.255.0
gateway 192.168.1.1
dns-nameservers 192.168.1.1
192.168.1.1 is my default gateway, and I just configured a static IP which ends with 240.
When my laptop's WIFI is on, I can easily access the server's files(.html files etc) through chrome from any computer on my house, as I just need to enter the server's IP into the browser, plus I can access the server through SSH. But when It's off, I can't even access the server's HTML files through the laptop itself, though I can see that the server is still running on VirtualBox. When I turn the WIFI once again, I can run services which require Apache2 but they really slow my internet connection, as a result I can barely surf the web. I am trying to configure the server to use only the bandwidth of my router, since my actual internet connection is 30 Mbit download and 1.90 Mbit upload(according to speedtest), and It probably interferes with it. Is it possible to access the server without WIFI connection, so it will purely use my router's speed?
Any help would be appreciated.
1) Looks like you using bridged networking in VM config. When your network adapter is connected to real network - you can interact with your VM via network bridge. When it's not connected - your bridge is also closed. If you need to interact with your VM without WiFi connection - you can add one more virtual network adapter to you VM config: use "Host-only" adapter and configure it on both VM and host PC. Your VM will use new host-only adapter to interact with your PC, and old bridged adapter to interact with other network.
2) Check your WiFi speed near the router. Maybe it's too far or provides too weak signal.
PS. Sorry for my poor english.
Related
I have a remote machine (Linux) and a local laptop (MacOS), I would like to resolve network traffic to certain domains/IPs transparently via the local laptop in an effort to essentially share a VPN that's running on the laptop with the remote machine.
The network conditions of the laptop are unpredictable as it could be on public wifi, mobile tethering or my home network - so I cannot set up a VPN running on a static IP.
I wondered if I could forward UDP traffic over SSH via -R, host a wireguard server on the laptop and connect to it on the remote. Turns out that's not possible.
However, OpenSSH has the -w flag (docs) that allows the tunneling of any kind of IP traffic over SSH but requires setting up tun devices on both ends. I don't know exactly what that means or where to get started learning about it.
Googling tutorials on SSH tunnels turns up results for TCP port tunneling (-L and -R), but nothing on -w.
Can you point me in a direction where I can figure out how to do this and if this will even work for me?
I want to use R Server constructed on a Ubuntu system on the Alibaba Cloud to do some elastic computing. The data is on the office computer, which has a firewall to prevent information leaking. I want to update the data to the cloud server for analysis.
I tried WINscp. It won't connect to the server (Connection timeout). I also tried PuTTY, which didn't work, either.
Could this be because of the Firewall?
Since you mentioned that your office has firewall rules in place to prevent data leaking, it is possible that your office firewall has blocked outbound traffic to port 22 (SSH), which is required to connect to your Ubuntu ECS instance running on Alibaba Cloud.
You should try to connect to your Ubuntu ECS instance from other locations without your office's firewall and see if it works.
Alibaba Cloud's ECS instance allows in-bound traffic access to port 22 by default based on their product page as below.
Source: Default security group rules
The security group created by
the system has only rules for access over all ICMP ports, TCP Port 22,
and TCP Port 3389, of which,
All ICMP ports are used by network devices, including routers, to send
error messages and operational information.
TCP Port 22 is used to connect to a Linux instance using SSH.
TCP Port 3389 is used to remotely connect to a Windows instance using Windows Remote Desktop.
I have installed at work SAP Hana Express Edition 2.0 in my laptop. It runs on VMware/Suse. I also set up a static IP address so I don't have to change the client connections. This works fine when I'm at work.
I added the following to hosts file:
192.168.1.85 hxehost
Problem is that when I take my laptop somewhere else all my client connections time out. I checked the IP address in Suse and it's the one I assigned. How to fix this problem?
If I disconnect the laptop from the Internet, I get the following error:
JDBC: Cannot connect to jdbc:sap://192.168.1.85:39013/ [Cannot connect to
host 192.168.1.85:39013 [No route to host: connect],
This is my setup:
How you connect to the virtual machine's IP ports depends on the setup chosen for the VM networking.
The address 192.168.1.85 is part of the 192.168.1.x network, which is very popular for home-router setup and small LANs. It's very likely that your laptop is part of such a network, when not at work. So when you ping the address the laptop uses the network interface that is linked to this network (e.g. your wifi adapter) to look for the host with IP 192.168.1.85. Whoever host currently got the 85 in your network, it's likely not your virtual machine.
One easy way to avoid this is to setup the virtual machine with host-only network. For that you have to configure the network adapter in VMware (or whatever hypervisor you use) to use the host-only network and assign an IP address in a different subnet e.g. in 192.168.5.x. For the HANA client software on your computer, the address to use would, of course, be 192.168.5.85 but it would be stable across all networks your laptop may log into.
I have got a VM in Google Compute Engine. And I want to use this VM using RDP. I have enabled the firewall settings to accept RDP(TCP:3389). This works fine when I connect to it using a LAN connection. But when I try to connect to this VM using an ICMP connection(ICMP tunneling software), it shows an error that couldn't connect to the remote computer for one of these reasons:
1. Remote access to server is not enabled.
2. The remote computer is turned on.
3. The remote computer is not available on the network.
But my current configuration works fine when I connect over a LAN. I want to use RDP using an ICMP tunnel. Is there a way to use RDP using ICMP?
Ping also works when trying to connect through ICMP.
I have my Openbravo appliance running by VMWare workstation on top of Win7 which is in a LAN connected to internet by router.
When I start the appliance. I can access ERP web console by typing in the address it gave at the end of the process (for example, 192.168.1.107). All computer in the LAN can access this address as well which is fine for now.
However, in the future, I need to access this console from my home pc running Win7 (which is, of course, connected to the internet). How do i set this up?. I have try the method given in http://planet.openbravo.com/?p=8612 (see case 3 - Expose my local ERP into a remote network)
I tried (in Openbravo Appliance console running in VMWare)
ssh -R :9999:localhost:80 myhomepc#101.108.70.128
(where 101.108.70.128 is the ip of my home pc read from whatismyip.org)
but it give the following error:
ssh: connect to host 101.108.78.128 port 22: connection timed out
Do I missed any step required?
What should i do the successfully connect to my Openbravo instance?
Best is to ask those questions directly in the Openbravo ERP forums over there: http://forge.openbravo.com
The case 3 from the blog-post you are referring to makes 2 implicit assumptions.
a.) the remote computer runs an ssh-server
b.) This ssh-server can be connected to from the erp instance
One of the two assumptions seems to not hold in your case either your win7 box does not run an ssh server and/or the router of your home network does not forward port 22 from the outside to your win7 box.
Without further information i assume both items are not done.
Let me propose another solution instead. As you want to connct to the commandline of the erp appliance from home you could do the following:
Configure the router of the network with the erp appliance to connect some external port (i.e. 2222) to the ip of the appliance, destination port 22.
This will allow you to access it from the home network (or any other system from the internet knowing the ip/port).
Using an external port different from 22 some simple ssh brute-force passwords scans.
As the appliance by default does not allow login by password but only allows authentication by public-key this is secure to not allow unauthorized access to your system.
After this either use case 1 from the blog-post or an normal ssh tunnel like (ssh -p external-port user#externalipoferplan -L 9999:localhost:22' and then access the ERP via 'http://localhost' from your win7 box.
If that is too complicated and you want to just make the ERP webinterface available from the internet without having the extra ssh security in the middle then you can just configure the router of the erp lan instead to forward port 80 or 443 (http or https) to the erp-instance and access the system directly from anymore as if it would be on some public server in the internet.