Questions tagged [routing]

the process by which data packets on communication networks are forwarded into the direction of their ultimate destination by routers.

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FreeBSD jail routing issue

I have the following setup with FreeBSD jails and VNET which is supposed to grow into a DNS core net lab setup. The jailhost and the jails are running FreeBSD 12.1. The jails are connected by epair ...
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Alternative solution to SNAT for particular use case

I have the following setup. If I add a SNAT rule in VM I can successfully route PC traffic through VM (instead of sending it to Ethernet directly) means I can connect to internet. The rule is: ...
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Linux Client network issue

I have a two Linux machines . Client A and Client B and both clients located in same Data Center. I couldn't reach the client from A to B But I can able to reach, from Client B to A. . Here I ...
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How to do port forwarding from EC2 public IP to another EC2 IP?

I'm running two apps on a single EC2 instance: Website on Apache running on Port 80 Java Application on port 8080 which is used by my android app. The way I access Java application by hitting the ...
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Route Table Multiple Subnet Entries?

So just as a bit of context, this is for a VM running that does call processing. So I was looking at the route table on the VM, and noticed that it has this: 12.12.12.64/28 dev bond15 proto kernel ...
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Serial Interface Network Address Decreased by One In EIGRP Configuration In Packet Tracer

I'm trying to implement EIGRP on the following topology The problem is, whenever I assign the network IP to a serial interface in EIGRP, the IP decreases by one. For example, when I use network 197....
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Traefik TCP reverse proxy working for HTTPS but not HTTP

Trying to make a Traefik reverse proxy sending port 80 and 443 traffic to kubernetes on another server. Important to notice that HTTPS traffic must be passthrough and thus sent encrypted as is because ...
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35 views

Can you have two subnets on a network with the same IP block? [closed]

I have a bunch of routing boxes on a network 10.9.9.0/24. I'm testing out scenarios with IPSec and StrongSwan, and I'm scripting a way to efficiently run these scenarios. Right now, the script I run ...
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Exposing udp server behind NAT using openvpn

I have a server behind nat that requires public access to it, and a VPS with an OpenVPN server on it. The goal is to make it possible to use VPS's IP to access the server behind nat without anything ...
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42 views

Failed expand string in manualroute

I try add route with redirect based on mx record. But my regexp never work. Exim 4.90, os ubontu 18.04. My config: non_mydom_mx: driver = manualroute #condition = ${lookup dnsdb{mxh=^mx\d\...
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Centos7 / NetworkManager - how to reload route files?

How can I reload the running NetworkManager routing configuration from the route-XXX files in a Centos/RHEL7 server? I have a few servers which get routes updated directly via the /etc/sysconfig/...
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Working from home - VPN Routing

We have a FortiGate VPN, on which we once configured that all vpn clients (who work from home) have all their traffic go through the VPN. However, now we want only the traffic that goes into the ...
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50 views

Sharing same IP across two NICs, to route one IP over dedicated NIC

I have a few hosts connected to the same switch, which are all on the same subnet (10.0.0.0/16). Two of these hosts have faster network interfaces so I have connected them together, meaning these two ...
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Disable routing between vlans in cisco

i have got a problem in which i need to config router where it won't be possible to send ping from vlan 10 to vlan 20 on this same side of router however it must able to send packet on the other side ...
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544 views

What does link#6 mean in routing table?

File exists when pushing route with OpenVPN I see link#6 as a gateway. What does it mean? Why it is not an IP address? Thanks.
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Routing/forwarding packets between two interfaces

I need to route my PC network traffic through a VMWare machine. What setup I thought about that is using a vm with two interfaces and forcing the PC to send the traffic to VMNet1 instead of Ethernet (...
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Connect from WAN while OpenVPN Client connection is active

I've been trying to get this working for a while now, but still unsuccessfully. I hope you will be able to help me with it. I've got machine (Raspberry Pi), which has: Static local IP: 192.168.1.131 ...
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Does an IPSEC tunnel establish new sessions for traffic?

Background AT&T business fiber is basically rebranded U-Verse home internet. The "modem" (it's actually a router, but lets call it that for simplicity) has a hard limit of about 8K sessions. Even ...
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Routing and packet mangling

I’m looking to get packets from one subnet to another more than one hop away; take for example: [ 192.168.0.4 ] - - - > [ 192.168.10.11 ] - - - > [ 172.23.100.13 ] I would like 192.168.0.4 to ...
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HAProxy mail forward rules

I use HAProxy as mail frontend (IMAPS) in SSL termination mode (mail clients configured to imap server 192.168.88.2 (haproxy host)). Config: frontend ft_imaps mode tcp bind 192.168.88.2:993 ...
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478 views

What is the difference between Port Forwarding and NAT Forwarding?

In the D-Link router configuration, I found two notions, NAT Forwarding that pairs A Local IP Address with A Remote IP Address: And at the same time there is Port Forwarding that pairs A WAN ...
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Dropping all traffic for a single application expect for a specific IP

I have an app that need to have support proxy. To test my development, I've setup a proxy using squid with docker (proxy is available at 172.17.0.1:3128). It works fairly well. But to ensure I'm not ...
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Select next-hop based on source address

I'm trying to set up a Ubuntu-based gateway between clients and the core router, the ideal traffic flow should be: ClientGroup 1 (10.0.0.0/24) -> Ubuntu gateway (10.0.0.2) -> Core router (10.0.0.1) ->...
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OpenVPN Connection to server with 2 gateways

I have problem with routing (i think it's routing) on Debian server. I got 2 routers working as gateways (one of them is public). VPN Clients conecting to Router1 but getting TLS Handshake because of ...
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Nftables - how not to dnat an ip on interface (DNS)

I have been searching, but cannot seem to find an answer to my specific issue. I have the following rule today under prerouting: iifname "br0" udp dport 53 counter dnat to 192.168.22.5:53 However, I ...
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Communication between 3 different LAN Networks connected to 1 router

I have setup a complete LAN-only network, NO internet access. I have 1 Windows Server, 1 vCenter, 5 esxi, Router. The network diagram. enter image description here I have 3 network interfaces : ...
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Internal routing of external port forwarded domain on router TP-Link TL-ER5120 [duplicate]

I have two internet access (one fiber one backup vdsl2), and I use a multiwan router to link them to the rest of my network. My internal network contain a server that is accessible from the internet ...
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Multihomed Windows Server 2012R2 using both interfaces for network traffic

TL;DR: Multihomed Windows Server 2012R2 seems to use both interfaces for traffic to a specific network - routing table looks good, tracert behaves like expected. When all other routes to this network ...
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Need help routing smtp from internal mail server over external VPS

I have a public vps that serves as a frontend for a server locally hosted in house. These are connected over a vpn hosted by another server in my network. Atm I managed to route web traffic and ...
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1answer
29 views

Redirect all traffic from IP alias to hyperv virtual machine

I have a Windows server 2016 instance with one nic and two IP aliases. It's possible to route all traffic from one IP to a virtual machine running on hyperv? The virtual machine is running Ubuntu with ...
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How to handle regrex in pathprefix for traefik 2

apiVersion: traefik.containo.us/v1alpha1 kind: Middleware metadata: name: middleware-stripprefix-test namespace: test spec: stripPrefix: prefixes: - user/api-resources - user/...
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Manually subnet an IPv6 Prefix Across Multiple MikroTik Routers w/out Prefix Delegation

I want to configure my network so hosts can IPV6 auto-address Global Unicast Addresses ("GUA") using SLAAC. I have a ::/48 (assigned by Hurricane Electric) that I want to divide into subnets and ...
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persistent “Destination Host Unreachable” for new IP block

We recently upgraded to a whole cabinet for colocation, with the upgrade we are planning on adding more servers. When we first moved into the new space, we were given a /29 IP block - 130.250.76.144/...
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pritunl vpn server setup - routing not properly working

I've setup pritunl VPN Server on a local virtual machine (CentOS 8 minimal version). When I connect as a client from a differnt device on a different network all the traffic gets routed through the ...
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Accessing Remote Desktop through VPN on Windows Server 2012 r2

We have 2 networks at my current workplace - an administrative network everyone uses and a "lab" network which only engineers, scientists, and developers use. I have control over all servers and PCs ...
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How do I get an XP computer to send files to its archive when connected on different a different router?

Good day folks. I'm wondering if its possible for my portable ultrasound machine to send back its images to the central archive when its off in the wards doing scans. Here's the current setup - the ...
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23 views

Docker container on host with two NICs connected to internet

I'm running a docker container with port 6882 exposed on a host with two NICs. Each NIC is connected to a router with a public IP address. How can I allow my docker to be reached through both public ...
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VM client doesn't route packages correctly anymore (to specific networks)

I have kind of a strange problem. After rebooting a server a few days ago, it doesn't route its packages correctly. It basically doesn't answer (pings for example) if these packages come from specific ...
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source based routing on windows server 2016

I have a windows server with two NIC cards connected to two different networks. NIC 1: IP: 192.168.1.50 Gateway: 192.168.1.1 Internet Service Running: Webservice1 NIC 2: IP: 172.26.15....
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Making an `ip rule` higher priority than `local`

I'm trying to redirect a subsection of incoming traffic to a different destination using fwmarks. The procedure 1) Mark matching incoming packets: iptables -t mangle -A PREROUTING -i pppoe0 -p tcp -...
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Connecting to a FortiGate VPN through docker and macos

I need to create a docker based solution in order to connect to a remote host via VPN. The only way in macOS seems creating a virtual machine acting as gateway to the VPN. macOS --> VM + docker ...
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How can decide no ping with site-to-site VPN on Strongswan?

I have 2 Linux routers in two different geographic location. And I want to create a site-to-site tunnel between these Linux-routers. I use Strongswan. The tunnel successfully up, but ping between ...
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How does a router route an ip packet if two subnets are attached with different netmasks but same prefix

Imagine we have 3 subnets attached to one router: Host A: 192.168.1.1 Netmask: 255.255.255.0 Host B: 192.168.2.2 Netmask: 255.255.255.0 Host C: 192.168.2.3 Netmask: 255.255.0.0 If Host A sends an IP ...
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48 views

Control which GCE VMs use dynamic routes in a GCP VPC?

I have a GCP VPC that receives dynamic routes from a BGP peering over a partner interconnect, but not all GCE VM instances in my VPC should make use of those dynamic routes... Is there any way to ...
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Redundancy for a device with 2 NICs on same subnet reaching other networks

I have a Linux based device with two NICs: NIC1 eth0: 192.168.1.100/24; Gateway: 192.168.1.1 NIC2 eth1: 192.168.1.101/24; Gateway not set This device communicates with an Application Server (IP: 10....
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OpenVPN: redirect all HTTP traffic from clients to Squid

I'm trying to setup Squid as transparent proxy inside my OpenVPN network: __________ ________________ _____________ | Client | | OpenVPN server | ...
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Cannot PING between two network interfaces

I am playing around AWS EC2 instance and I came across a strange problem. I created an EC2 instance (Instance A) with 2 network interfaces, and the following is the routing table: default via 172.31....
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Routing Internet Traffic through VPN tunnel

I am relatively new to the topic, so please do not mind if I ask simple (or stupid) questions. I own a Raspberry Pi 3B and installed and configured an OpenVPN server on it. Therefore I followed this ...
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32 views

DNS behind NAT (PowerDNS)

I'm having two different locations for DNS servers. I'm using PowerDNS. Locally everything works fine, but when I want to update from the Master the update over Internet is not working. I'm using on ...
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71 views

Port forwarding inside LAN on OpenWRT

I have the NAS with Nextcloud in my local network (192.168.1.20). Nextcloud is using port 444 for https. In order to access nextcloud from the internet I got domain (domain.name), add my external IP ...

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