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.

Filter by
Sorted by
Tagged with
0 votes
0 answers
13 views

Gentoo hangs when adding main interface to the bridge

I've VPS on WEDOS serverhosting, Gentoo there. 5.4.38 kernel. I've a network interface eth0, I need to bridge it with another one (from openvpn). Starting with adding only one interface: brctl addbr ...
user avatar
  • 103
0 votes
1 answer
15 views

KVM bridge only assiging ipv6 adresses on VM

I use KVM in bridged network mode so I can have a VM that has an IP from the host LAN network. My host (Ubuntu 18.04 server) networking is configured as below : network: ethernets: enp0s31f6: ...
user avatar
0 votes
0 answers
17 views

bridge with bonding interface

I have some scenario like below [F/W] [F/W] eth1| |eth3 + + [ CentOS7 ] + + eth2| |eth4 [B.B] [B.B] Line1 = eth1, eth2 Line2 = ...
user avatar
  • 11
0 votes
0 answers
9 views

routing connection trough bridge to a gsm modem

I have a linux box with gsm modem on interface wwan0 which is managed by network manager, and I want to give it a static ip, the idea is to use a bridge and a veth interface with set ip address. I'm ...
user avatar
  • 1
0 votes
1 answer
90 views

Linux: bridge vs. vlan vs. tcpdump

I have a Proxmox host with kernel 5.15.19-2-pve. It has a bond0 interface made from eth2 and eth3, which receives vlan tagged traffic. I created a vmbr666 bridge that shows looks like this: # /etc/...
user avatar
0 votes
1 answer
64 views

Routing traffic from a bridge to a specific interface

Fundamental question about routing in Ubuntu 20.04. I have a baremetal setup in Hetzner which has an 11.22.33.44/32 IPV4 address along with 2a01:db8:30/64 subnet allocated to it. enp7s0 is the ...
user avatar
0 votes
0 answers
23 views

Charmed Openstack linux bridge instead of OVS bridge

I did install the charmed openstack reading the documentation provided at docs.openstack.org. However, i made a mistake, configured the bridges as linux bridge instead of OVS bridge on MAAS to compute ...
user avatar
-2 votes
1 answer
101 views

Bridging with OpenVPN on a VPS without an actual LAN on the server side for LAN Gaming [closed]

I am trying to set up an OpenVPN-Server on a VPS that allows LAN Broadcasts between the connected clients. Now I read that you need bridging for that. But in my case the VPS has no LAN. It is just the ...
user avatar
  • 1
0 votes
0 answers
218 views

Access to VM using KVM bridged network interface inside company network not working outside of room LAN

I work at an institute so as you can imagine we have the typical proxy, AD, DNS and so on in place. My group is looking into transitioning to Linux for our servers (containing several GPUs for various ...
user avatar
0 votes
1 answer
84 views

virbr0-nic unmanaged in KVM/Cockpit

I am running cockpit on Rocky linux to make a KVM host. I have installed and enabled all 4 nics onboard and they are showing up as managed in the management tab except virbr0-nic when I run the create ...
user avatar
0 votes
1 answer
175 views

Two tap device can't communicate over bridge

I want to exchange Ethernet Packet between two tap device(for implementing TCP/IP protocol stack in usermode). The problem I encountered is that tap1 and tap2 only can receive broadcast packet through ...
user avatar
0 votes
1 answer
295 views

MTU Problems with vxnet over wireguard and linux bridge

My Setup: Several Proxmox Hosts with one eth0 connected to LAN via bridge (vmbr0) in proxmox. (Default setup) There is another "dummy" bridge device for internal traffic between Guests (...
user avatar
0 votes
0 answers
122 views

ip forwarding traffic from inside bridge network

I have the following network setup. I am running a host with 2 vms. Each vm is running debian with cri-o, running some containers. The containers each have an ip address on the 10.200.0.0/24 subnet. ...
user avatar
  • 151
0 votes
0 answers
10 views

ifcfg-br0 exists, but bridge is not created upon reboot

OS - RedHat Enterprise Linux 8.5 (Ootpa) I have created the following file: $ cat /etc/sysconfig/network-scripts/ifcfg-br0 DEVICE=br0 TYPE=Bridge DELAY=0 STP=off ONBOOT=yes IPADDR=192.168.1.10 NETMASK=...
user avatar
  • 209
0 votes
0 answers
206 views

ARP Reply is not forwarded to TAP device through Linux Bridge

Create two TAP devices, each of which will be read and written by the userland protocol stack. In addition, the two TAP devices are bridged by the Linux Bridge. The script to prepare the environment ...
user avatar
0 votes
0 answers
31 views

Captive Portal Redirection with Bridged VLAN Setup

Background I have configured OpenWRT in the Bridge Mode. I push the packets from L2 to L3 using net.bridge.bridge-nf-call-iptables=1 Untagged Packets Scenario In the case of untagged packets, this ...
user avatar
0 votes
1 answer
150 views

Can't connect container with bridge to the internet using networkd

i have a server running Ubuntu 20.04 LTS connected through one physical ethernet interface to the internet. My prodiver assigned me a static primary IP4 (i will use A.A.A.A here for this IP), so my ...
user avatar
  • 26
1 vote
0 answers
73 views

How to bridge a physical subnet with a public server?

So I've been banging my head on this issue for a while, hopefully someone can help me here. My idea is to run a proxy (nginx, traefik, etc) on the public server, with authelia or some other kind of ...
user avatar
  • 11
2 votes
0 answers
151 views

How to bridge TAP device to overlay network?

I would like to allow OpenVPN users to reach all Docker containers that are part of Overlay network as if they were in the same LAN. The simplest example is 3 containers distributed on 2 hosts, and ...
user avatar
0 votes
0 answers
28 views

Linux bridge leaking traffic of shutdown vms

I've a linux bridge (br0) setup with netplan as the following: version: 2 renderer: networkd ethernets: eno1: dhcp4: no dhcp6: no bridges: probr: interfaces: -...
user avatar
  • 1
1 vote
0 answers
91 views

Why do I see many "kernel: vif ...: Guest Rx stalled" / "Guest Rx ready" messages?

Since upgrading a Xen host that also is a node in a pacemaker cluster from SLES15 SP2 to SLES15 SP3, I see these messages roughly every 30 seconds, and I wonder: What are these messages telling me? ...
user avatar
  • 266
0 votes
1 answer
39 views

Can a group of VMs, each with it's own public IPv4 address, mimic being on a private subnet and, if so, how can I integrate with existing network?

TLDR;Synopsis Can a group of VMs, each with it's own public IPv4 address, be organized so as to mimic being on a private subnet and, if so, how can I connect those servers to the rest of my network? ...
user avatar
0 votes
0 answers
133 views

Make bridge with two dummy interface

I need to test some daisychain working. but not enough interface. internet | [ eth1 ] [ dum3]--- [ ] | [dumbr0] [ dum4]--- [ eth2 ] | ...
user avatar
  • 11
0 votes
1 answer
41 views

Why do I routes to containers locally and how can I do better?

I'm setting up a new server at a new site. The server is placed behind a router / firewall. The server shall run several LXC containers for various services. The LXC containers are connected to a ...
user avatar
2 votes
2 answers
265 views

Block traffic to/from host from one side of a bridge

If I have two ethernet interface eth0 and eth1. They are bridged (br0). The host running the bridge can communicate with the network using any of eth0 or eth1 depending on wich are connected to the ...
user avatar
  • 153
1 vote
1 answer
150 views

Difference between network bridges created by `ip` and `nmcli`

I notice that the bridges created by ip command and nmcli command are distinct: # Create a bridge via ip command and name it br-ip ip link add dev br-ip type bridge # Create another bridge via nmcli ...
user avatar
1 vote
0 answers
308 views

Filtering traffic by MAC address with nftables

TL;DR: when spoofing MAC addresses, how can I make sure the real addresses won't be leaked to the rest of the network using nftables ? Context For network security training purposes I am currently ...
user avatar
  • 457
0 votes
1 answer
440 views

How to enable external access to the Virtual machine on private link?

I would like to benchmark virtual networking of KVM-QEMU. For this purpose, I connect two servers (server 1, and server 2) with one wire. I use server 1 to run the QEMU VM and I want to access this VM ...
user avatar
  • 101
0 votes
0 answers
27 views

Proper debian configuration for bridge/tap interface for use with QEMU

I am having troubles restoring my internet connection after bridging my network and a tap interface. I am using debian 5.10 and following this guide: https://wiki.debian.org/QEMU#Networking My ...
user avatar
0 votes
1 answer
350 views

OpenVPN Layer 2 Ethernet Bridging

I have an OpenVPN server running on an Ubuntu 18.04 machine and I want to connect to the server using an Ubuntu 20.04 machine through ethernet bridging (layer 2). I have successfully created the ...
user avatar
1 vote
1 answer
161 views

Ubuntu KVM vm nic connected to the network bridge dns resolution issues

Ubuntu 20.04 server with multiple NICs and KVM server installed on it. Created a bridge with netplan: enp0s31f6: dhcp4: no addresses: [] bridges: netbr0: addresses: [192.168.14.20/24] dhcp4: ...
user avatar
  • 133
0 votes
0 answers
113 views

Layer 2 MitM Setup

Layer 2 MitM setup: +------+ | HOST | +--------+ |------| +--------+ | CLIENT | <--> | MITM | <--> | SERVER | +--------+ +------+ +------...
user avatar
0 votes
0 answers
50 views

How to share VPN network access

I have got this setup with two LANs and OpenVPN infra. I need to share the OpenVPN connection attached to Proxmox server (10.8.0.12) to the Proxmox VMs (192.168.0,1,2,3,...). I was trying to use linux ...
user avatar
  • 1
0 votes
0 answers
148 views

Why brctl stp cannot prevent the loop?

Even the STP is enabled through brctl stp switch on on a looped network, the packets cannot be forwarded successfully. Please note that if there is no loop in the network, then everything is ok. The ...
user avatar
0 votes
0 answers
203 views

libvirt bridge incoming traffic not forwarded

I have a public ip block 51.x.x.16/28 that I'm trying to use with libvirt/qemu VMs. Inside the VM (ip 51.x.x.18) I'm trying to create an outbound tcp connection (http). Using tcpdump on the host I can ...
user avatar
  • 1
0 votes
1 answer
97 views

Is there a way to configure port security on Linux bridge?

On switches there is such a feature as Port Security. Roughly speaking it allows to control, which exactly MAC's can be on the specific switch port. You can restrict it to just one MAC or several, and ...
user avatar
  • 115
0 votes
0 answers
189 views

Forwarding traffic between two interfaces on Linux: bridge or iptables?

If I have two interfaces, eg. wlan0 (wireless clients on the home network) and eth0 (Ethernet interface with Internet traffic) and I'd like to forward traffic between them, I could try to: create a ...
user avatar
0 votes
0 answers
12 views

Add persistent bridge & tap Ubuntu 20.04 Server LTS [duplicate]

I'm trying to create a bridge whose interface is a tap, both with static IPs, and have them persist across reboots. In Ubuntu 14.04.6 LTS, this could be accomplished by editing /etc/network/interfaces ...
user avatar
2 votes
1 answer
1k views

Add persistent bridge and tap in ubuntu 20.04 server

I'm trying to create a bridge whose interface is a tap, both with static IPs, and have them persist across reboots. In Ubuntu 14.04.6 LTS, this could be accomplished by editing /etc/network/interfaces ...
user avatar
0 votes
0 answers
57 views

Force IPv6 NS source to be global instead of link

In summary, how can I force an interface to use the global IPv6 address as the source for neighbor solicitation messages rather than the link address? Background: Many VPS providers do not allocate a ...
user avatar
  • 1,385
0 votes
0 answers
214 views

KVM client not getting IP from bridge

I recently upgraded from ubuntu 18.04 to 20.04 and now I'm unable to get KVM bridges to work. For testing purposes I'm using a bone stock 20.04lts install with only the required KVM, bridge utils etc ...
user avatar
  • 111
1 vote
0 answers
57 views

Advice required for sending STP BPDU traffic between tap interfaces connected by common bridge

Need advice for the bridge tap interface to run stp traffic. created the tap interface and bridge   Have come across stp BPDU is consumed by bridge. i'm running the scapy on the host, however i'm not ...
user avatar
0 votes
0 answers
76 views

Shared layer 2 state in a P2P Tunnel between two Linux Machines

Assume two Linux Hosts, that are directly connected to each other cia ethernet and their ethernet interface is always up. I am wondering if there is a tunneling protocol implementation that would ...
user avatar
0 votes
0 answers
29 views

How to access IP4 server from IPv6-only MacOS client

My telco provider made some unannounced changes to my iPhone's hotspot settings last week, whereby they essentially disabled my phone's hotspot from providing its clients with IP4 (DHCP assigned) ...
user avatar
  • 209
1 vote
0 answers
395 views

How to configure a hypervisor such that a KVM/QEMU virtual machine can reach hosts connected to the same trunk bridge?

1 Problem My goal is that all LAN traffic is routed through a virtual machine (VM) acting as a router and firewall. Other VMs on the same hypervisor should also be routed through the firewall VM. See ...
user avatar
  • 11
1 vote
1 answer
194 views

KVM Bridge forward packets only one-way

I have configured linux VM using virsh/libvirt/kvm and having problem with bridge network. Default NAT network from libvirt was working fine, but I need bridge to public interface. I have removed ...
user avatar
  • 123
0 votes
0 answers
319 views

Connecting two VMs running in KVM

Short: Get two VM's to talk to each other running on same hypervisor. I have two VMs running under KVM and I am trying to manage them via Cockpit. The hypervisor, and the vm's are running Ubuntu 20.04....
user avatar
  • 111
1 vote
0 answers
269 views

How to (properly) configure PPPoE/VLAN decapsulation on Linux bridge?

I've been trying to setup a transparent L2 Linux bridging firewall using a Linux bridge in combination with the bridge-nf-call-iptables, bridge-nf-filter-vlan-tagged and bridge-nf-filter-pppoe-tagged ...
user avatar
  • 11
1 vote
0 answers
89 views

Establish KVM bridge with static IP

I would like to establish a virtual machine (KVM) on Ubuntu Server and configure bridge networking in order to connect to the VM via static IP. I want to connect to the VM directly via SSH (bypassing ...
user avatar
  • 11
2 votes
0 answers
65 views

No responses to ARP requests

One of my server's physical interfaces eno3 is part of a bridge br0. There is also one LXD machine attached to this bridge (nictype=bridged, parent=br0). Sometimes ARP stops functioning completely. If ...
user avatar
  • 21

1
2 3 4 5
18