Questions about using a router/networking, e.g. port forwarding, VPNs

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Route traffic of specific direction

Given there's a server that does not have a default internet gateway. An app on this server is trying to access Gmail's IMAP. Is it possible to route this specific traffic through internet gateway? ...
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0answers
67 views

ARP for a multihomed machine (Linux)

I try to configure two interfaces on my server to behave as independently as possible on the same medium. However I have some problems with ARP (maybe related to ARP flux). I hope somebody can ...
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2answers
568 views

Default gateway 0.0.0.0 on-link

My laptop's NIC went bad and I had to start using a USB Ethernet adapter. When I start up the computer, or even simply unplug and plug in the adapter, it gets two default gateways which show up in ...
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1answer
52 views

Remote IP on a local device

What I want to achieve is to be able to have one of the IP addresses from a remote server on a local server (raspberry pi). Right now the network map would look like this: RPi (192.168.0.42) ---> ...
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3answers
100 views

Windows Routing Table not allowing Permanent Route

I have come across an odd problem today. When trying to add a route to the Routing Tables (in Windows 7 Professional x64), I am using the command Route add –p 192.168.20.0 mask 255.255.255.0 ...
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1answer
16 views

route to another network Adapter

I have two network adapters. One is a wireless one that all my devices are connected to and the other is a virtual connection in my Windows 8.1 notebook. I want to do something (port forwarding proxy ...
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0answers
27 views

Connect two machines through an intermediary machine

I am dealing with 3 machines: X (where my database is) , Y , Z ( where my java application is). X has a route to Y and Z , Z has no route to X but has a route to Y , Y has no route to X but has a ...
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29 views

Custom Local Direct Route Windows

I have an external IP address of a load balancer that I want to route locally for internal servers. What's the best way to do this? I was thinking I could use the command line route command to add a ...
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1answer
116 views

Default gateway “dissapears” from the routing table

I use NetworkManager (Arch Linux) in my laptop in order to connect to wireless networks. I use the official GNOME GUI. Everything works fine, but after an half an hour or so the network is still ...
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1answer
32 views

how to access a range of public IPs only through a VPN?

For security reasons, I am not supposed to access an otherwise public IP range unless a VPN is up. However, if my VPN is down, my system routes to the IP anyway, which is a breach of my obligations. ...
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1answer
235 views

can't connect to FTP server — disconnects after FEAT command

I'm trying to connect to an FTP server of which I do not control. WinSCP & FileZilla both do not connect. Here is a scrubbed down log: Status: Connecting to xxx.xxx.xxx.xxx:21... Status: ...
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2answers
196 views

Routing tables and ip forwarding between two machines

Hi my current network is like that [Raspberry]--eth0--------p3p1-[Laptop]-wlp3s0------[Router]-------INTERNET eth0 = 10.10.10.2 p3p1 = 10.10.10.2 wlp3s0 = 192.168.2.11 Router = 192.168.2.1 I would ...
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1answer
203 views

Why does my (home) router append a DNS suffix?

I wonder if any other people have come across this. I've rented rooms in two houses this year, and they both have Sky (a UK ISP) Broadband routers. For some reason, the router I currently use hands ...
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0answers
18 views

Masquerade in both directions [duplicate]

I have a two networks that I need to link in two directions. network A 10.11.0.0/24 - and its gateway 10.11.0.1 network B 10.0.0.0/24 network B has a server (10.0.0.38) that is connected to the ...
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1answer
59 views

How do we route Youtube through another server?

I know it can be done through a VPN but I'm trying to make it more dynamic. I have tried using a 'tcpforward' script which did what it stated and forwarded packets to/from the youtube server. But that ...
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0answers
159 views

Network resource access control (maybe using VLANs?)

I'm trying to set up a network that has a couple of different device groups with different access rights. Physically, devices are connected to the network either via wall-ports or via one of several ...
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2answers
109 views

Can I do policy routing on a virtual interface?

I know it is possible to give multiple IP addresses to the same interface, say eth0. It is also possible to build several virtual interfaces on the same physical NIC, say eth0:1, eth0:2,.... Suppose ...
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1answer
56 views

Bidirectional two networks link

I have a two networks that I need to link in two directions. network A 10.11.0.0/24 - and its gateway 10.11.0.1 network B 10.0.0.0/24 network B has a VPN server (10.0.0.38) that is doing a ...
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1answer
144 views

Internet completely messed up after closing VPN

I use a VPN from time to time that lets me access certain resources (eg. music sites) that would normally be restricted to the US. I recently got an account for PrivateInternetAccess which works fine ...
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0answers
170 views

Android devices does not know route to a host located in the same network

There is office network (with single wifi router). I'm trying to connect (web browser, telnet) android devices to my host (both connected to the same router via wifi). The router settings: IP: ...
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0answers
111 views

Connection fails after one packet, server is unreachable by some clients while reachable by others

I am clueless about this issue. I have a machnine with Windows 2003 Server R2. From time to time the following issue arises: The server is accessible from certain clients From other clients (on the ...
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0answers
37 views

VPN across three VPS's

I have three servers running on virtual machines. The gateway is 192.168.0.1, and the hosts are the numbers 2,3 and 4. The first host is serving a PHP script which outputs the visitor IP ...
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1answer
46 views

Windows Routing Table

Consider following routing entries in windows route table: Address Mask Gateway Interface Metric: 0.0.0.0 0.0.0.0 10.0.43.1 10.0.43.6 10 127.0.0.1 ...
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1answer
45 views

How to route traffic originating from a specific interface?

On my OpenWRT router I have three interfaces, a WAN interface wan, a LAN interface eth0, and a OpenVPN interface tun0. I want to route all traffic originating from eth0 to a particular IP address ...
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1answer
524 views

Route traffic from one address to another on one interface and to everything else through another interface

I have a small embedded computer running busybox. It has a wired eth0 interface, which is connected to an on-board wlan-module's wired interface by a cable. Also there's an 3G module on ppp0. I need ...
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1answer
171 views

Default gateway is lost

A weird thing is happening here. I am using TPLINK WDR3600 as server, which is connected through Ethernet with a modem in bridge mode. I use 2 PCs and a cell phone on my LAN. Something is happening ...
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2answers
504 views

Route traffic through VPN to some IPs occasionally

I would like to route traffic to some specific addresses through VPN. Easy enough, one can simply add a route: ip route add <destination ip> dev tun0 scope link Here comes the catch: I do not ...
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7answers
6k views

IP address that is the equivalent of /dev/null

Is there an IP address that would result in any packet sent to be ignored (blackholed)? I know I can always set up a router with an IP address and then just have it ignore all packets sent to it, but ...
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4answers
96 views

Where did the routing table on my Windows PC come from?

When I connect to a LAN, I know a DCHP server will provide my PC's IP address and the default gateway (these will be part of the route table) and that loopback addresses are probably automatically ...
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0answers
82 views

Ping through GRE tunnel discarded between 2 interfaces of a router - Ping does not reach subnet

I have an interesting issue that I hope someone can help with. I am trying to create a GRE tunnel between 2 routers (running Linux Ubuntu 12.04) and pass traffic between 2 subnets trough this tunnel. ...
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1answer
52 views

routing table, ip address for outgoing packet

Network Destination Netmask Gateway Interface 0.0.0.0 0.0.0.0 192.168.2.1 192.168.2.8 ...
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0answers
86 views

Simplest FreeBSD SSH (-w) VPN setup for RoadWarrior

I'm looking for the simplest FreeBSD specific example of configuring an OpenSSH VPN (using -w) that will route all traffic not destined for the clients local network over the VPN. An example scenario ...
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58 views

Adding an IP block into VMWare Esxi

I have a dedicated server with VMWare Exsi 5.5 installed and I have recently bought another /29 from my colo provider. They have set things up so that it works this way: Original: Network: 1.2.3.1 ...
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2answers
188 views

Why nic with incorrect subnet mask can still ping the gate way?

At first, my network config was like this: $ ip a 2: em1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 3c:97:0e:bd:b1:68 brd ff:ff:ff:ff:ff:ff ...
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1answer
33 views

Best way to route internet through remote comptuer

Alright, I'm not from the US and I pay for a VM running Windows Server 2012 in the USA. I have full access to that VM and I can install whatever I want on it. I want to be able to re-route my ...
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1answer
225 views

Traffic Route mismatch with two NIC Windows Server 2008

I have small issue on my network I have two NIC, NIC 1 Connected to the internet and local network, NIC 2 Connected to Sip Trunk Circuit (No Internet) Each one of them has different Gateway. My ...
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3answers
87 views

Two NICs work together

I got two NICs in my windows, one is Ethernet and the other one is wireless. Now I want the Two NICs to work together 1. Use wireless to access the Internet. -> (192.168.1.0/24) 2. Use Ethernet to ...
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1answer
121 views

From my 192.168 box, how do i find 10.0 virtual machine on the same box?

I am running Ubuntu 12.04 and Virtual Box 4.1.12. I have created a Debian server under Virtual Box. For reasons I don't understand, DHCP grants my Ubuntu box 192.168.20.50 and my Debian VirtualBox ...
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1answer
48 views

How to say windows not to use specific network connection for Internet traffic? [duplicate]

I have slow VPN connection to another computer, which is also connected to internet as my computer is. When this connection is active, all browsing traffic goes via remote computer, although it is ...
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2answers
1k views

Why can't I ping a network printer from a specific computer only on the same network?

I have a small home network with a few computers/tablets and a network-enabled printer, all connected through wifi. The problem is I cannot connect (ping) from one specific computer ("A", ...
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0answers
102 views

add routes on CentOS 6.3 with two subnets

Consider the following scenario and please help me to add static routes. I have recently purchased two servers. Each server has two nics and both the servers are connected using crossover LAN cable on ...
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1answer
136 views

On Linux, can I forward wlan0 to eth0, and wlan1 to eth1?

I have the following simple situation: two internet connections via two distinct ethernet NICs, eth0 and eth1, and two APs (I use hostapd, of course) on two distinct wireless cards, wlan0 and wlan1. ...
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1answer
87 views

Why can I only view certain devices if I am using the 192.168.2.1 gateway

I have a kind of weird problem. Every device we have at work printers, servers, etc. Exist on the 192.168.1.0 network. We have some remote devices that are an extension of our network and they ...
2
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3answers
51 views

PAT Internals. How is it de-multiplexed?

Question: Assuming PAT is enabled on my home internet router, how does my router know which hosts to de-multiplex packets to when it receives packets from the internet? Example: On my LAN there is 2 ...
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1answer
303 views

OpenVPN server on Virtualbox Guest. Can connect but fail to ping

As a development environment for my production server I have setup a Virtualbox guest. However I am failing to setup an OpenVPN Server. I can connect to my VPN without problems using (KDE ...
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1answer
20 views

why application proxies examine data in the packet?

in Packet Filtering as we know : every packet has header and data and we know thats : Packet filters examine only the header of the packet , because it contains IP source and destination addresses. ...
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0answers
34 views

Query an office gateway/router to confirm all routes?

Is it possible to send a 'query' of some sort to a gateway device in an office to see what subnets I have access to? For example, I know that I have access to multiple subnets because we have many ...
0
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1answer
214 views

How to route to public IP addresses from NAT where gateway is in subnet of target public ip addresses

I have the following scenario which is giving me fits. I have a block of IP addresses on a .248 subnet. The service is Comcast, and the modem uses IP addres ending in .246. On the router for my ...
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1answer
55 views

Can't get response from local server through wifi

I have a local server that hosts several websites. It's turned on into the router and has 192.168.1.2 as the internal IP. If I connect another computer to the same router with a cable, everything ...
0
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1answer
43 views

What can I do about my site being blocked by a particular server?

One of my websites is inaccessible via certain ISPs. I ran a trace route and I can see where it stops. Looks like it's owned by the ISP. Is there anything I can do about this? Can the hosting provider ...