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Using Linux server as a gateway for specific addresses in internal network

I have a RHEL 9 server which has IP addresses as 172.10.0.10 and 172.30.1.10, which is connected to two separate switches with two separate network interfaces. This server runs a virtual machine, ...
discouragedone's user avatar
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24 views

How to Allow all NATed traffic from iptables firewall via pfsense (gateway)

I have an iptables firewall (machine 1) and a centos 7 based gateway (machine 2), which is having 2 interfaces (machine-2:int-1) from WAN [/30] and (machine-2:int-2) is LAN [/28] one of the static IP ...
Ratna Kumar's user avatar
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37 views

Installing program on CentOs cluster for a non-root user

I am a beginner and want to install Material Studio 2023 in CentOs (version 7) cluster. I would appreciate any comments on my attempts which comes as follows: My tries: I used ssh to connect to the ...
Martin's user avatar
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Problem with Fedora 19 Gateway

I have a machine that runs Fedora 19. Updating is not an option due to software constraints. I have an image that I've copied from a working unit of the exact same model using Clonezilla. I've done ...
Derick Thomas's user avatar
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0 answers
59 views

Active directory server default gateway resolution issues

I am using a Raspberry Pi 2 running Ubuntu Server acting as an active directory domain controller with samba and kerberos etc as detailed in this video. I have three Windows 11 Professional clients ...
Oliver Ricketts's user avatar
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0 answers
298 views

Can't add secondary gateway for secondary interface in Ubuntu 22.04

I have two interfaces and both of them have a public IP address. One of them (eth0) is primary and the other one (eth1) is secondary. I'm trying to setup it through netplan + iproute2. When I was on ...
Semyon Bayandin's user avatar
-1 votes
1 answer
136 views

How is my _gateway ARP entry address resetting itself to a "hardcoded" value?

I've got an ubuntu linux PC on a private 192.168.x.y LAN. It's got an IP on the 0 subnet (192.168.0.y) and is able to ping other PC's on the 0 subnet. It looked like the _gateway MAC address had been ...
LukeDev's user avatar
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Debugging IPv6 connectivity in fresh Debian 12 installation

Context I installed Debian 12 in my machine a couple of days ago, and since then I have been facing some issues with (outbound) IPv6 networking. From my investigation so far (having gone through ...
cronos2's user avatar
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87 views

Centos 7 Two Gateways (virtual and VLAN) question

I could not get this working. I have two public ip addresses . on centos 6 my setup was eth0.2 VLAN2 was DHCP from ISP 1 and eth0:1 was static ip address from ISP 2. It worked out the box without any ...
user3265051's user avatar
1 vote
0 answers
225 views

dhcpcd deleting gateway

I'm trying to switch from DHCP to static IP by using dhcpcd. When I switch from static to DHCP I'm configuring that eth0 (which used to have the static address) will also be the one with the DHCP ...
user2384330's user avatar
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1 answer
58 views

Unable to block traffic with iptables

Router1 is gateway for another router(2). Router1 has set 10.0.0.1/8 lan network to which router2 is attached. 10.0.0.1 is obviously the bridge ip address of lan as well as assigned gateway ip for ...
Svetoslav's user avatar
1 vote
0 answers
437 views

Why would an iptables rule for ANY proto only allow ICMP traffic?

Basically, I have a Linux box (Ubuntu Focal) configured as a gateway: sysctl net.ipv4.ip_forward = 1 #Enable ipv4 forwarding iptables -t nat -A POSTROUTING -o ens160 -s 192.168.1.0/24 -j MASQUERADE ...
A. Trevelyan's user avatar
1 vote
0 answers
245 views

How to setup a VM Gateway like Whonix but for a generic VPN

I created a linux VM with 3 interfaces: a NAT interface for internet access (eth0 with ip in this range 192.168.84.0/24), a Host-only interface for communication with other VMs (eth1 with ip 192.168....
Alpha Neptunium's user avatar
0 votes
1 answer
619 views

Using ssh reverse tunnel as gateway to reach machine under NAT

I'd like to reach a machine under a network with NAT and without port forwarding. The machine "closed" behind the no-port-forwarding NAT is called RaspberryB. This machine create a reverse ...
Neopard's user avatar
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39 views

Does DHCP on dd-wrt support the absence of the default route?

I have one reason to flash dd-wrt onto my router (rt-ac66u), which is to be able to not assign any default route via DHCP. The stock firmware doesn't seem to be able to do this. Dd-wrt appears to be ...
Andreas's user avatar
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1 vote
0 answers
113 views

Change tap device gateway

I have vps server, install softether on it , softether use tap device name tap_se with subnet 192.168.24.0/21 netmask 255.255.248.0 broadcast 192.168.31.259, clients connect with openvpn or l2tp to ...
Arman Kabir's user avatar
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0 answers
99 views

API service on port 8080 is not responding to KONG Container on same machine

I am using Kong Gateway to proxy requests to API services. The Kong gatway is running in a container on the same machine but seems that it cannot access to the API service (504 ERROR bad gateway). Is ...
mehrdad asadi's user avatar
1 vote
1 answer
320 views

How to automatically select the interface as the default gateway based on internet connectivity?

I have two interfaces (one wired and one wireless) where both gets their IP via dhcp and any of them might or might not have an internet connection. I need to create a fallback mechanism that prefers ...
ceremcem's user avatar
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1 answer
1k views

Route all traffic from one interface (default gateway) through OpenVPN / tun0 - policy based routing, dependent on source address/interface

I have a Debian Linux VPN router myvpnserver with 2 interfaces, eno1 and eno2: eno1 is connected to a LAN and an internet router. On this interface with static IP address, myvpnserver has its default ...
MrSnrub's user avatar
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1 answer
511 views

How to setup gateway on second DHCP server?

I need to add a static route to my internet service provider's router. Unfortunately, this router does not provide such a modification option for an end-user. The reason I need the static route is so ...
bomben's user avatar
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0 answers
68 views

IPforwarding for gateway not allowing certain software installs

I have a pi gateway I ultimately want to use as a VPN gateway but I'm having some issues with it being a normal gateway right now... Currently my set up is the following: Laptop > (eth1 169.254.169....
ISE7's user avatar
  • 1
1 vote
2 answers
733 views

How to override isc-dhcpd option in child group, to hide default gateway

Given the below configuration, how can I undo the routers option for the inner group so that certain machines don't get told what the default gateway is from the outer group? group { # A bunch of ...
Malvineous's user avatar
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737 views

firewalld: forward traffic as a wireguard VPN gateway

I have setup a pi running Pi OS 11 as a VPN gateway for my local network using Wireguard & Nftables, that all works fine. However, I wish to switch over to firewalld to be compatible with docker ...
uhsl_m's user avatar
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0 votes
1 answer
1k views

How to specify gateway address for static IP in OpenWRT /etc/config/network

I see the following example for static IP config: config interface 'lan' option type 'bridge' option ifname 'eth0.1' option proto 'static' option netmask '255.255.255.0'...
Dims's user avatar
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3 votes
1 answer
454 views

Unexpected Route Selection

I'm running BGP using FRR on Debian Linux on several machines. My question might end up having to do with something in the FRR/BGP configuration but I'm trying to understand at a more basic level why ...
bgp's user avatar
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0 votes
1 answer
825 views

Is it possible to set different default gateways on a per-application basis?

Suppose I have a machine on a network with two different valid, working gateways. Let's call 10.0.0.1 the "normal" gateway to the internet as supplied by an ISP and 10.0.0.2 a standalone VPN ...
Landak's user avatar
  • 364
0 votes
0 answers
348 views

iptables Forwarding and port blocking

I have created the following Network in Virtual Box: Linux Internal PC with 1 Static IP: 10.10.10.2 Linux Gateway/Firewall with 2 Static IP's and 1 NAT: 10.10.10.3 | 11.11.11.2 | NAT Network Card ...
superuser's user avatar
1 vote
0 answers
186 views

Ubuntu server to act as API gateway

A service provider requires that all HTTPS calls to its API come from a IP whitelist, this can be a problem when you're hosted in cloud. So I would like to setup an existing Linux (Ubuntu) Server, ...
neurino's user avatar
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0 votes
1 answer
257 views

How does ping command work internally

I have Ubuntu 18.04 and two network interfaces (eth0 & wlan0) attached to it. So, I have effectively two LAN's (say LAN1 and LAN2) When I fire a ping command simply like ping followed by some IPv4/...
Network_starter's user avatar
0 votes
0 answers
2k views

How do I correctly set up a Linux VM as a gateway to route all traffic through a Wireguard VPN connection?

I have been banging my head against the wall for a couple of weeks trying to figure out how to set up a Linux VM on a Mac to act both as a NordVPN client and a gateway/router to forward all traffic ...
Daniel Rosenberg's user avatar
1 vote
0 answers
85 views

Jetson Nano Picocluster not accessible from network

I recently received a Picocluster with five Jetson Nano boards running MicroK8S. The cluster has a built in switch, which I know works as I can route my own network traffic through it just fine. All ...
Thijs van der Heijden's user avatar
1 vote
1 answer
2k views

How to fix routing for Wireguard VPN Gateway

I am desperately trying to get my Wireguard-VPN-Setup up and running as my Internet Connection has been switched to IPV6 (DS-lite). My Setup(raw): NetCup VPS (acting as IPv4 contact point for my ...
Andi's user avatar
  • 11
4 votes
1 answer
1k views

Port forwarding does not work using different gateway

Let me try to explain my home network setup: ┌────────────────────┐ │ Internet │ │ Public IP: 1.2.3.4 │ └──────────┬─────────┘ │ ...
Arfian Adam's user avatar
0 votes
1 answer
593 views

firewalld port forwarding breaks outbound traffic on that port

I'm using a Linux computer as a gateway/firewall between the wider network and a few servers. WAN -> [ 192.x | GATEWAY (Linux) | 10.x ] -> [ 10.0.0.100 | SERVER (Linux) ] This configuration ...
Will Haley's user avatar
0 votes
1 answer
89 views

Isn't the gateway statement supposed to work for a subnet?

I'm using the following /etc/network/interfaces configuration on a Debian machine: auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 10.0.0.5/24 gateway 10.0.0.1 auto eth1 ...
Arseni Mourzenko's user avatar
0 votes
0 answers
2k views

Network is unreachable, destination host unreachable

I give up at this point. I've been at this for hours. I've installed Gentoo onto VirtualBox and somehow, I don't know how, I broke my internet connection, and as it happens to be, I don't have dhcpcd ...
Shidouuu's user avatar
  • 101
1 vote
0 answers
33 views

Two networks of type C on one interface

i need some help configuring routes. This is the situation: I have one ISP who is providing me with two /27 networks. ISP_NET1 -> 40.40.40.32/27 (ISP GATEWAY 40.40.40.33) ISP_NET2 -> 40.40.50.32/...
Konstantin Hristov's user avatar
0 votes
1 answer
325 views

Whonix custom workstation: Is it possible to automaticly detect whonix gateway?

I use Whonix downloaded gateway and custom OS as Whonix workstation (in VirtualBox). To connect the workstation to the gateway I need to manually set Address, Mask and Gateway to 10.152.152.10, 255....
mooko's user avatar
  • 23
0 votes
1 answer
66 views

What is the best way to store gateway information on redhat system

I have herd 3 different ways to store gateway information on redhat system /etc/sysconfig/network /etc/sysconfig/static-routes /etc/sysconfig/network-scripts/route- files I am not aware of ...
Ragini Dahihande's user avatar
1 vote
0 answers
232 views

OpenVPN client as a gateway: Ping from server to client works, but gateway does'nt

I have a working OpenVPN server up and running on an OpenWRT router, and want to use an OpenVPN client as a gateway for some local machines that are connected to my router. What i have done / What ...
Jean-Michel Ruiz's user avatar
1 vote
1 answer
4k views

NetworkManager doesn't change the metric of the default gateway immediately

I'm using the commands found in one of the answers to this question : How can I make changes to the network routing metric permanently Before, I change the metric of the PPP0 device (3G UBlox modem) : ...
Aminos's user avatar
  • 141
3 votes
1 answer
1k views

Use the internet access of another network interface when the main one is down

I have an embedded system running Ubuntu 18.04 LTS that has a 3G modem and an Ethernet interface (eth0). Both of these interfaces have access to Internet. When the internet is unavailable on the ...
Aminos's user avatar
  • 141
0 votes
1 answer
158 views

Can I run a virtual machine or like a linux shell in a webapp/website or host it on a webserver?

I asked this question before and I am going to refine it so I can get a better answer. I am planning to make a java webapp and I want to add a feature to it which is what I need help with. I want to ...
shammakh2's user avatar
-1 votes
1 answer
31 views

How to use gateway with multiple lan

I try to create 3 LAN with different range on same gateway but I have a conflict in the dhcpd, can you help me to resolve my problem please ? subnet 192.168.42.0 netmask 255.255.255.0{ range 192....
rmarquet21's user avatar
0 votes
1 answer
73 views

Forwarding incoming ports to another private IP on my existing setup, IPTABLES

On my Debian 8 gateway: I want to forward incoming port 9000 to 192.168.4.10:3389 and incoming 9001 port to 192.168.4.11:3389. DHCP - WAN - eth0 -----> eth2 - LAN - 192.168.4.1 I am using rules.v4 ...
user611811's user avatar
1 vote
0 answers
1k views

How do I best setup Directory Services in a Linux-only environment (Ubuntu Server 20.04.01)?

SITUATION: I am setting up a Linux only environment, (two, maybe; SOHO and home system), where I am quite certain that their will be no Windows machines taking part in domain services, (short of ...
Top Rock Photography's user avatar
2 votes
1 answer
2k views

using netplan to create a gateway

I am trying to use netplan to set up a gateway. Here are some details of what I have set up: I'm running 20.04 I have 5 NICs (enp5s0, enp4s0f1, enp4s0f0, enp3s0f1, enp3s0f0) The enp4* and enp3* ...
jordan399's user avatar
0 votes
1 answer
856 views

OpenVPN Change ROUTE_GATEWAY after the IP of the gateway interface changed

The server had 192.168.56.9 in before and changed to 192.168.56.10, but the ROUTE_GATEWAY is still on the old IP: $ openvpn --show-gateway Sat Apr 18 13:18:54 2020 ROUTE_GATEWAY 192.168.56.9/255.255....
gies0r's user avatar
  • 131
1 vote
2 answers
1k views

SSH connection issue with failover gateway

I have a system which can be accessed via SSH and HTTP. The system have two interfaces (eth0, eth1), and is working with Slackware 14.1. eth0 : 192.168.1.99, LTE Ethernet Gateway/Modem eth1 : 172.16....
Alexandre Lavoie's user avatar
0 votes
1 answer
672 views

Setup routing on Ubuntu machine to ping between vlans

I am using KSZ8895MQ micrel which is a L2 managed switch with VLAN configuration connected to micro controller. OS is Lubuntu with DHCP server configured. I am able to get the different VLAN on the ...
sumit's user avatar
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