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Questions tagged [ip-forwarding]

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Circumventing Local Subnet Control Restrictions with Iptables

I have three wireless speakers that, for security reasons, only permit local subnet control. My network is setup such that the wired and wireless devices are on separate subnets, so right now the ...
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16 views

How does an Interface know which interface to route packets to?

I have 2 interfaces on my Ubuntu18.04. wlp3s0 which has internet connection and vboxnet0 which lacks one. I followed some online guides and understood that I needed to enable IP forwarding. I did ...
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21 views

Forwarding Home Game-Server through GRE Tunnel | Can't ping remote GRE IPs

I am having trouble routing my game-servers through GRE. I do not receive a ping from either side when pinging them. I can ping the local GRE interface; however, I cannot ping the remote GRE interface....
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37 views

Kubernetes cluster not working after setting up IP forwarding

I am doing a research project and our end goal is to essentially construct a kubernetes cluster using several Raspberry Pis. I've included the fact that we are using Raspberry Pis for reference, but I ...
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66 views

Mac OS pf redirect error cksum incorrect

Scenario Server A - 192.168.43.215 - listens on port 4000 Client B - 192.168.43.207 - Mac OS 10.14.6 I want: connection to B at localhost:8080 ---> A:4000 ex: following command on B's terminal ...
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42 views

Subnet to subnet forwarding traffic

I'am wondering how to forwarding traffic from a gateway to subnet. network setup I have this working setup, Host A behind tunnel can ping HOST B 10.151.0.1 but not HOST C 10.151.0.2. If I TCPDUMP ...
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2answers
29 views

How can I forward / redirect http to a public IP with nginx?

I have a domain example.com with DNS A record pointing to a public ip x.x.x.x. I need to get all http and https requets from that server and forward that traffic to another public ip y.y.y.y. Any ...
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1answer
101 views

Why IP address overlapping occurs in IP forwarding table?

My understanding of an IP forwarding table is that they have a listing of different networks (identified by their IP ranges) and connects it to the next-hop router. However, I'm surprised why two ...
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1answer
35 views

Forward ISP IPv6 from LAN to secondary LAN

I want to forward (or bridge, next to routing ipv4) the IPv6 internet connection from the LAN1 to LAN2. IPv6 internet is accessible on LAN1. I have a windows server, configured as NAT router between ...
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23 views

Forwarding a subdomain through DNS to a different server / IP, but with working SSL certificate

I am wondering if the following is possible. We have two different servers. One server is with Plesk and the other is a LAMP-based server without a control panel. On the Plesk server we have domain ...
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99 views

In IPv6 router gets the Router solicitation message, but not respond with Router advertisement

We setup a IPv6 network with two ubuntu systems and we make one PC as HOST and other as ROUTER(based on the concept of SLAAC). The host sent the "Router solicitation" message, but the router not ...
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1answer
101 views

OpenVPN - Access to other client private network

I know that this title seems to be "over answered", but really I had no luck while searching... EDIT: I've updated the diagram and the question, to be more precise To better explain my situation, ...
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51 views

Ip forwarding and redirection - mac os x

My setup is as follows: (Internet)<->en0:192.168.101.15 (macos) en6:10.22.5.15 <-> (LAN) I am trying to make my LAN see the Internet. I already tried things like pfctl with nating and ...
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1answer
618 views

iptables - bridge / routing between two independent LANs (and router)

I can't find a solution in a network like in the drawing below. I need to be able to open admin page of router 2 on LAN2 from a pc in a LAN1, w/o routing throught Internet. I have a "bridge" PC with ...
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1answer
296 views

How to access the floating ip in browser rather than a localhost?

I have an instances that was made in OpenStack which have a floating IP for its instance, the IP for this machine is 10.1.1.164. I tried to forward this instances so it will accessible in my firefox ...
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1answer
23 views

How to forward public_IP/dashboard of an HTTP server to private_IP/dashboard?

I have a website which is accessible internally via http://private_IP/dashboard. The public IP forwards all traffic to the private IP. http://public_IP -> http://private_IP. This works. However, ...
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1answer
501 views

Ping public ipv6 dns from docker container

The docker container is running on a VPS (ubuntu 18.10). What I am able to do: ping -6 2001:4860:4860::8888 from host machine ping -6 <docker container ipv6 address from host machine ping -6 &...
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64 views

route traffic from VPN server LAN (cloud) peer to VPN client

I have set up a Google Cloud deployment roughly configured as such: node B, which is at address 10.0.0.6 and default route is through 10.0.0.1 node V, which is a VPN server, on same subnet at 10.0.1....
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73 views

IP/Packets Forwarding [closed]

I have searched a lot about IP + Packets forwarding but there was not enough information to find. Is forwarding only used in case of Virtual Private Networking or it has also other uses? if yes, when ...
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1answer
102 views

Routing from LAN into OpenVPN

I need to set up a route from our local network into our VPN. That is, anybody from inside the LAN should be able to communicate with machines in the VPN, without being a VPN client itself. Problem is,...
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1answer
2k views

Squid 4.2 - Different outbound IP for each client/user

I have been playing with a few different pieces of forward proxy software, primarily CCProxy and Squid Proxy/Cache. What I have is a dedicated server with a single NIC with multiple IPs assigned to it....
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466 views

forward all traffic between two ports without iptables

I have read this: Port forwarding on Linux without iptables? I have a vps and I have ran lxc containers on it. I want to redirect all incoming traffic from one outside port to one port of a container ...
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34 views

Selectively setting default gateway for traffic forwarded by IP tables

I'm attempting to forward traffic from a publicly available host to a private host located on a VPN. The TCP packets need to retain the original source IP address. I've set IP address forwarding: ...
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1answer
67 views

Ip forwarding - multiple subnets, multiple Ethernet ports

There are plenty of examples on here of how to forward ip traffic on a linux machine, and a few examples of how to forward traffic from one interface to another. However, most of the latter examples ...
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1answer
252 views

Attach multiple static IP to windows server instance on Google Cloud

My aim is this Host multiple websites/apps on IIS that is configured on my windows server instance on Google cloud e.g example.com (to host the website), api.example.com (to host api endpoints), app....
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1answer
1k views

Docker bridge and nginx allowed ip

We have a docker bridge containing several docker containers. The main docker is an nginx server which acts as web host and forwards all data to the other containers. Now a requirement is that the ...
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372 views

(Mac OS PF) Redirect outgoing UDP traffice to specific ip:port

I'm having some trouble getting my head around how PF works in Mac OS. I have been doing a lot of research on the topic but just cannot find the solution (although I can find many other very similar ...
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1answer
420 views

Forwarding all traffic to proxy server

I am trying to build a proxy server that will receive all client packets and forward to the content server. As I read the proxy type is "forward proxy". While doing the system architecture I couldn't ...
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1answer
7k views

How to Turn on IP Forwarding for Interface If Forwarding Rule Was Already Created

I am trying to turn on IP Forwarding for an interface of an instance hosted in Google Cloud. I have a f1 micro VM instance on Google Compute Engine. I've created an IP forwarding rule with gcloud ...
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0answers
577 views

Sharing CheckPoint VPN connection

Sorry for my english. I have 2 VirtualBox VM. One with Debian 8 and the other with Ubuntu Server 14.04 LTS. Both configured with a bridged network adapter. Both machines have the same MAC an IP ...
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1answer
500 views

NAT public IP to local IP | IPv6

I'm trying to create a small gateway for a home project. I have a NODE, GATEWAY and EXTERNAL machine, running on a public IPv6 network. Though the NODE is not connected via ethernet, but my goal is to ...
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1answer
602 views

Ip forwarding very slow in google cloud

I have set up GCE-instances (google cloud) and EC2-instances (aws), and I want to set up routing like this: AWS-DUB <-A-> GCE-LON <-B-> GCE-TOK <-C-> AWS-TOK Connection A is ...
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2answers
249 views

How to forbid forwarding packets to private network addresses via interface

On my server, I have a default route to interface eth0. It has public internet address and faces ISP network. I have packet forwarding enabled, and few local interfaces/bridges with private 10.x.x.x ...
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1answer
218 views

Host and VM share same IP frustrating intent to forward all incoming traffic to UTM on VM, what to do?

I a new to virtual networking and have been at it about 2 months. I have a physical machine (PM) with physical ports eth0 and eth1. Eth1 is not being used. Rather, eth0 is attached to both the WAN on ...
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108 views

How to test route lookup performance?

I need to test (IPv6) route lookup performance in the Linux kernel. I want to know how much time it takes to find a match if there are 100 routes, or 1000, or 10000 and so on. I'm using containers, so ...
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1answer
4k views

How to Access a host behind a server over VPN (IP Forwarding)

I have a Ubuntu server (172.10.200.11) and many remote terminal units with simcards and each individual simcard operator using different IP pool such as 10.57.0.0/16 for OP-A, 10.112.0.0/16 for OP-B, ...
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1answer
917 views

Layer 3 IP Forwarding/NAT between two interfaces

I have a strange configuration, let's see if you can give me some advice :) I have two networks (10.X/24 and 20.X/24) conected by a linux machine between them. This linux have two interfaces, each ...
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1answer
77 views

Connect clients of different networks that I CANT change its netconfig

I have two clients Android phone doing hotspot (192.168.43.1/24) Another device with static ip (192.168.1.10/24) I CAN'T change the network config of anyone, first because android hotspot is ...
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5k views

routing setup on centos7

I'm new in routing but need to accomplish the following routing task I have 3 machines Machine A, B, C, CentOS7 on each of them, selinux disabled, firewall not installed Machine A has 3 nics, ...
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169 views

Port forwarding while retaining the source IP?

I have a dedicated server, which I have everything running off, however the dedi lacks DDoS protection, so I have purchased a VPS that comes with it, so I can effectively use it as a proxy. I have ...
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60 views

2 Node Linux Cluster - Architecture Validation

so I have a 2 node galera cluster on single 192.168.10.0/24 IP subnet as on this layout: My problem is not about Galera but connectivity. Node1 is unable to reach Node2 via ICMP hence my Galera ...
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1answer
46 views

How to create a private network with same production ip address? And How to make communication between using linux machine as router?

I have production network in some IP series say 192.168.X.X in Vmware. In this i have some machine. I need to create a test setup. I have created a separate VLAN. Those VLAN were not connected to any ...
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2answers
40 views

What prevents an ip_forwarded-enabled server to be used by an attacker as a router

Setup / Question Given a server on the public internet with the IP 185.48.117.176 with /proc/sys/net/ipv4/ip_forward=1 and no iptable-rules. What prevents an attacker that is directly or indirectly ...
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1answer
787 views

IPv6 forwarding seems to only work in one direction

I now know the answer: I did a bad mistake and did not even tell you. There was also a running radvd for router advertisment and instead of RA'ing a 64-net I was RA'ing a 56-net. So the router and/or ...
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71 views

smtp-request behind iptables-router not working

I set up a router with ip-forwarding on Ubuntu 16.04 Server edition. I enabled ip-forwarding in /etc/sysctl.conf . I have set net.ipv4.ip_forward=1 and executed sysctl -p /etc/sysctl.conf I used ...
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1answer
261 views

UFW 0.35 - Redirect incoming port 2121 to port 21 on VM (other interface)

I'm posting here because I've got a server, and I want to redirect the port 2121 of my main interface (eth0) to the port 21 of my secondary interface (virbr0). This is my configuration : Physical ...
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1answer
46 views

HTTPS between two port forwarded domains in Azure, problematic?

I'm not too comfortable with these things, but quite possibly what I'm asking is trivial. I have a site hosted at foo.azurewebsites.net And also an API at bar.azurewebsites.net (WEB API as an API ...
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611 views

How to redirect a URL from hostapd without internet access?

I have configured my server with iptables rules in order to forward all traffic to a specific domain. Those are NAT rules and the redirection works fine as long as I have internet access. But when ...
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1answer
38 views

Send local traffic from host A:3306 to host B:3306

I'm having trouble making sense of all the iptable examples out there. I simple want all requests from my machine to host A on port 3306 to actually go to host B on port 3306. How can I do this?
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128 views

Naked Domain Forwarding Broken on Godaddy with Period Slash

Is Godaddy naked domain forwarding broken when you have a ./ in the URL? I use GoDaddy for DNS and have naked domain forwarding setup. I have my A record @ set to GoDaddy servers, and use their ...

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