Questions tagged [bridge]

Bridging is a forwarding technique used in packet-switched computer networks. Unlike routing, bridging makes no assumptions about where in a network a particular address is located.

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VLAN 'Bridging' for Core on Multiple Networks

I think I have a very unique use-case that I need help with since I am not a network engineer. Here's the layout. I help operate a gaming floor network for a Casino. The thing that I noticed right ...
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Difference between VMWare Bridged network and Docker ipvlan/macvlan?

In Virtual Networking, I have seen two techniques to connect the guest machine with the Host machines network. In VMWare/VirtualBox - Bridged Networking is used to connect the guest machine with the ...
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Does the linux bridge have in-built DHCP and DNS server? [closed]

Does the linux bridge have a dhcp server built in to the bridge software? And does the linux bridge support working as DNS-Server or it can only point towards the DNS server on the host or none. If ...
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Bridging two (a physical ethernet with a virtual ethernet) different subnets on linux?

I am thinking if it's possible to create a bridge while allowing each bridged network to exist in it's own subnet. Network 1 - Say, I have a physical ethernet based network eth01 - with subnet 192....
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In virtual networking, how does a Virtual Switch differ from a linux kernel bridge?

I have seen that in virtual networking, guest VMs/containers can be connected with host and internet either by using kernel bridges(linux) or Virtual Switches. Example - Bridges docker uses linux ...
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qemu-kvm guest OS can access host using bridge, but cannot access other devices on same network

I want to run a qemu-kvm guest with Debian 9 as its OS on a Debian 10 host. The host is connected to the local network, and I would like the guest to be "visible" to the local network as if ...
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linux bridge can merge vlan?

I have a PROLINK router. it`s bridge set below: # brctl show bridge name bridge id STP enabled interfaces br0 8000.000c120060b0 no eth2.1 ...
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linux bridge.sh connection lost

i am try execute in my google vm, but the connection is lost and i need reboot the machine in google console panel i also test using screen -s test sh start.sh ctrl + a + d ubuntu 20 not-minimal ip ...
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VLAN aware bridging for KVM hypervisor on debian 10 (buster) and later

I am setting up a new KVM hypervisor and the VMs will need to connect to several VLANS (one VLAN per VM). However I can't find good documentation or instructions on how to configure the hypervisor or ...
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OpenVPN bridge no default gateway

I am trying to configure the bridge in a LAN through OpenVPN. But the client for some reason does not have a default gateway. The client receives the IP address. In LAN server's address is 192.168.1....
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Having some issues with proxmox bridge on Hetzner

So, i'm having 1 main IP and 1 addition IP that I've ordered for the server. Main IP: xxx.xxx.200.200/27 Additional IP: xxx.xxx.202.175/27 This is my bridge configuration: auto lo iface lo inet ...
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Debian KVM Server - Add Secondary Subnet

I have a Debian 10 server (from Hetzner) that I want to set up as a KVM host to set up virtual machines for myself. The server itself has a static IP like so: auto lo iface lo inet loopback iface lo ...
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Understanding KVM Bridges

I've spent a few days learning and playing with KVM. I understand a Bridge is like a virtual unmanaged switch. I looked at a few install guides (i.e. https://www.itzgeek.com/how-tos/linux/centos-how-...
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Can't get ARP reply on macvtap device

I have a physical server at Hetzner with two assigned public IPs in different /27 ranges. One is for the server itself and the other is for one VM inside it. The host is running CentOS 8 and libvirt. ...
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Ubuntu server 16.04 and OVS 2.5.5 Stretch VLAN across 2 sites

I am proof of concept for a client, the requirement are the following: Stretch across 2 site the ERP network (stretched VLAN), this is needed due to dated machinery that have to talk to a particular ...
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macos qemu tap can't ping bridge ip address?

I want to install qemu on macos and use a tap device in the vm. Below is my step. install qemu brew install qemu install tuntap, after installation, I can see tap devices in /dev/tapX brew install ...
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Docker ip overlap ELI5

Can someone please ELI5 how overlay network works under docker. The documentation isnt quite clear on it. The main problem is because the gw_bridge uses a network range which will cause overlapps at ...
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73 views

Run docker in an existing network namespace?

Would it be possible to run a docker container inside an existing namespace ? I created a namespace using: ip netns add client Now I want to run a container (with a bridge or host network, whatever is ...
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how to connect 3 servers under two private networks

server2 (10.0.0.2) <--> **server1** <--> server3 (10.0.1.3) output in server1. netstat -rn Kernel IP routing table Destination Gateway Genmask Flags MSS Window ...
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Slow upload speed on three different Ubuntu servers on bridge interface

I manage three Ubuntu servers running latest LTS, all up 2 date. The two first are behind a fast fiber networks, with a bridge interface (for containers) Both have an OPNsense router running in ...
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Ubuntu after bridging network no internet

I am running an Ubuntu server with OpenVPN and apache on it (192.168.178.30). The FritzBox (Router) is 192.168.178.1. OpenVPN is is bridge mode. When I start the bridge using the OpenVPN shell script (...
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158 views

Linux Networking Bridge With Veths Not Able To Send Outbound Packets

I've been running into an issue where a Linux networking bridge I create on Ubuntu 18.04 cannot access the Internet. I have a network namespace in Linux that I want to run an application in. I want ...
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79 views

Bridged networking OpenVPN, client side network config? What to consider?

Ahoy friends. Currently i got 2 seperate networks, one in my home country, and one in anothe country where i currently am. Here i'm using an OpenWRT device with LAN devices connected to it. I don't ...
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67 views

Passthrough of OpenVPN clients to local network

Ahoy friends. Unfortunately i don't have that much knowledge about OpenVPN but at least i want to try to get my idea working. Currently i'm using a VoIP device connected to my local area network, and ...
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Enabling DHCP on Linux Host for libvirt VMs

This is a follow up question from here: How to disable default DHCP on virbr0 and obtain IP from DHCP on host I have a Ubuntu server 18.04, with Libvirt based Virtual Machines setup over virbr0 ...
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OVS Bridge :: How to Delete a Persistent sFlow Export Session?

I have an OVS bridge (OVS version: 2.9.3) that currently has two sFlow monitoring sessions going: root@linux:~# ovs-vsctl list sflow _uuid : 12cbdc49-cd9a-4909-91c6-1da7ea82bbaf agent : "ens1f3" ...
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Repeated loss of network connectivity to QEMU/KVM/virt-manager VM

I'm having frequent network connectivity failures under the QEMU/KVM/virt-manager stack on openSUSE Leap 15.1. I have a single VM running a software firewall, which is losing connectivity every few ...
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28 views

Reading and manipulating traffic between two ethernet nodes

I have two machines, directly connected via LAN cable. Each has their own IP, and they are communicating in their own VLAN. 10.10.10.99/25 for machine #1, 10.10.10.16/25 for machine #2, vlan 0x50. I ...
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multiple Qemu vms with network bridged scaling issues

I have setup multiple qemu virtual machines. They are launched connected to virtual taps (each VM has its own) qemu-system-x86_64 -enable-kvm -hda my_drive.qcow2 -m 1024 -netdev tap,id=t1,ifname=tap0,...
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Routing between linux bridge and openvswitch?

My scenario look like this: As you can see the Node1 use OVS and Node2 use Linux bridge (LB) I need to make both KVM1 & KVM2 can see each other over network. The configuration on OVS I use in ...
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VM in KVM with different network, A can ping B but B can't ping A ? (Bridge KVM network)

I have 2 VM in KVM, and 2 network default and new 1 use defaut network:(virbr0) 192.168.122.0/24 IP: 192.168.122.152. fowarding: NAT the other use new network:(virbr1) 192.168.124.0/24 IP: 192.168....
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OVS Bridge — How to Toggle a Port Between VLANs?

I am an Old School network guy trying to do some development work on an OVS Bridge. I need help figuring out the syntax to toggle the OVS bridge interfaces between VLANs. First, some system ...
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25 views

Bridge client isolation forward traffic to gateway

I have a wireless AP that is implemented using a linux bridge. Im trying to isolate the clients so that they can not communicate directly over the bridge but instead have the traffic sent to the ...
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Routing traffic from bridge to vlan

I have a bridge interface connecting 3 other interfaces. Now I want to route all traffic from this bridge to a vlan interface. How should I go about doing this? Ideally, I would want the traffic from ...
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114 views

Create Multiple Bridges in Windows Host to be Used by QEMU VMs

I have setup a QEMU VM with two TAP adapters (i.e. I have two adapter interfaces in my VM), and I am using OpenVPN's ethernet TAP driver to get such adapters. I have two NIC cards in my host machine, ...
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Proxmox/KVM Bridged networking breaking ssh connection

I'm running into an issue with Proxmox/KVM. I have setup a second bridge (vmbr1) that covers the IP space 172.16.1.0/24. I have assigned 172.16.1.1 to vmbr1. The vmbr1 is setup according to this. I ...
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244 views

CentOS 7, KVM, bridge, VLAN, bond and no guest traffic

I'm running into an issue where my KVM guests have no network traffic in- or outgoing. After a lot of hours debugging I'm pretty sure I'm missing something essential. What I have a server with 2 10 ...
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Linux packets going to strange interfaces when NATing between bridges

I have a desktop computer (Ubuntu 19.10) running containers and VMs. Its ethernet enp2s0 is bridged with systemd-networkd: [Match] Name=enp2s0 [Network] Bridge=bridge LinkLocalAddressing=no The ...
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179 views

Bridge over VLAN interfaces causes broadcast storm

I am doing experiments on my Proxmox server. The purpose of the expriment is to establish reliable and fault-torrant communications between two PCs that control industrial equipment. but I am puzzled ...
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98 views

How to access the page of a bridged modem with a different default IP from the router?

I set up a modem as a range extender as in this thread. Initially I set it to WDS-only and could connect only via ethernet, so I wanted to login to the modem and change to Hybrid to also connect via ...
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875 views

Bridge + nftables: How to redirect incoming HTTP/HTTPS traffic to local port 8080?

I have set up a bridge and would like to redirect HTTP/HTTPS traffic traversing it to a local port (8080) so that I can further process it using mitmproxy. So far I was using a combination of ...
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247 views

Attach KVM VM to vlan-filter capable bridge

I am trying to use new vlan-filter capable bridge on Virtualization Host running OEL 8.1. It does not support OpenVSwitch out of the box and I think vlan-aware bridge might work. Now I have (...
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844 views

Creating a bridged WiFi AP (hotspot) in Centos 8 (or Fedora)

I am trying to create a bridged WiFi hotspot on a Centos 8 system, using NetworkManager. The machine is Dell EPC3000, with two built-it GigE's and ath10k wireless adapter, plus an LTE WWAN. Creating ...
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Linux bonding Mode 1 (active-backup)

I'm trying to configure the bond (active-backup) on three server (one act as storage) with 2 nic and 4 ports using 2 switches (ISL is present). The goal is to not break the connection to the storage ...
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444 views

Ping does not work on TAP interfaces with bridge

I am trying to understand the linux bridging and local ip rules, I have following topology on my linux laptop. br0 ___________|__________ | | |tap0 ...
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196 views

nftables NAT combined with VLANs and routing

My network has a rather complex setup I can't unfortunately simplify, currently it's being half-solved by two different devices (that cause a few other problems) and I wish to replace them with one ...
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240 views

How to bridge two VMWare vsphere “VM Network” on two different site?

I got Two site with some ESXi 6.7. Each site has his own IP addressing and I would like to bridge the "VM Network" on the distant site to the local "VM Network" so I could start a VM replicat on the ...
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Bridge 2 LAN networks via SLIP on RS232

I have a stupid problem (I hope) that is driving me crazy 😊 I've created a network, drawn below. -------------+ ROUTER 1 ROUTER 2 | +---------------...
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161 views

Lost connection to the server after adding new bridge to network configuration

In a Proxmox server (Debian), I changed my network config from this: source /etc/network/interfaces.d/* auto lo iface lo inet loopback auto enp0s31f6 iface enp0s31f6 inet static address 88....
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54 views

Use a tethered PC as a gateway to WAN while allowing the same PC access to the LAN [closed]

Some background to understand my question: I have no fixed internet connection at home. Only internet access is through my mobile phone. I tether my mobile to whichever device needs internet access ...

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