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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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Netplan bridge issue

I am trying to create a bridge using Netplan. I copied this part of the guide. But it gives me an error: root@ubuntu:~# netplan generate Error in network definition //etc/netplan/01-netcfg.yaml line ...
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Ping devices on local network via PC on Azure VPN

I'm trying to ping a device on a PC's NIC (Ethernet) with a static IP of say 192.168.1.1 (This IP is fixed, it cannot be configured or changed unfortunately) that is connected to an Azure SSTP VPN. I ...
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KVM: Hosts with private and public IPs

We have a small block of static IPs (e.g. 203.0.113.0/29). We currently only use 203.0.113.2 for a mail server. We'd like to add some other public servers, and if possible would like to have them ...
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Linux Security - Systemd-networkd (Clear Linux) - Topolgy of bridge interfaces (br0/br1)

All, Apologies for the rookie questions, but this is my first dive into Linux and systemd, so I'm hoping someone with better knowledge than myself can help here. I have a physical server running ...
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Why does arp_ignore=1 break ARP on POINTOPOINT interfaces? (kvm guest)

If I add the following settings on a kvm guest: net.ipv4.conf.all.arp_ignore=1 Networking of the guest stops (highly intermittent). The kvm host uses bridge-networking: auto lo iface lo inet ...
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How to filter packets bigger than 80 bytes in ethernet bridge (RasPi Debian)?

I'm working with RasPi with configured a bridge between two Ethernet interfaces. More or less I followed this guide The bridge works fine. But now, I'm trying to filter tcp packets bigger than 80 ...
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Network connectivity interruptions on bridge in case a new device is added or removed

I am currently tracking down a connectivity issues of docker containers on a custom bridge network, which I could reduce to the Linux network stack without docker being involved. The situation that I ...
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Bridge networking in ubuntu guest on freebsd host using vm-bhyve

i'm a little less learned on bridging thus need help in guest networking. I've setup 2 ubuntu guest on a freebsd vm-bhyve. created a single switch public which has 2 tap insterfaces namely tap0 and ...
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Configuring VLANs in Mikrotik RouterBOARD 750 r2

I'm having a hard time trying to configure VLAN tagging in a Mikrotik router. The same has 5 interfaces which I'll describe below: Interface 1 and Interface 2 --> ISPs Interface 3 --> Uplink to a ...
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118 views

Route QEMU VM traffic through hosts VPN

tl;dr Host connects via VPN to the internet and a VM on this host doesn't go through this VPN (but it should). I think the network config isn't quite correct. The host The host (arch Linux) connects ...
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Linux: Speeding up traffic destinated to the bridge itself

I am attempting to follow this advice to speed up traffic destinated to the bridge itself. My situation seems to check all the boxes: server also talks to other hosts, bridge ports don't have IP ...
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Adding a bridge kills the internet connection from all interfaces

I'm working on debian stretch with the newest xen from repositories. I've never worked with xen before, so bare with me. I've searched far and wide, and all solutions I apply do not work. Installing ...
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Bridge is loosing packets

I have a Router running OpenWRT 15.04. The Router has a dedicated Wifi Radio, which is internally connected to eth5. I am running 2 Wifi Networks on that Dedicated radio, one is running on vlan 3. So ...
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bridge0: received packet on bond0 with own address as source address

I have created a bond using netplan (ubuntu 18.04) which shows the same MAC address for the two member physical NICs and the bond itself. I configured a bridge on top of that, for use with KVM/Qemu ...
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HP Procurve STP Path Blocking

I have four Switches that are interconnected with each other, witch form a loop as shown in this network diagram The switch 1 is the root bridge and is connected to the primary edge router. The ...
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Setting up pfSense to bridge LAN NICs and connect WAN

I have a machine with four NICs (physical ethernet ports) and I'd like to set up a fully updated pfSense on it. So far it looks like this: A few things I've done so far: I've set up the bridge ("...
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VPN IPSec between Google Cloud and Local Network - Arris Modem

I'm trying to establish a VPN IPSec between my local network and my virtual PCs under Google Cloud Platform. On Google Platform: Private Network: OK External static IP: OK Firewall rules: TCP, UDP, ...
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Openvpn Bridge - can connect but no LAN or WAN

I have had a routed openvpn server running for some time. I am trying to set up a bridged connection so that my vpn will be on the same subnet. I have the following config file for the server. When ...
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bridges make ping stall

I had a problem that after connecting to wi-fi ping shows stalling. You can see here intervals of stable ping: I had from 10 to 20 bridges which was produced by docker, I decided to remove all of ...
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LXC guest connects to network in spite of misconfigured Gateway

I am running an LXC container on Slackware 14.2 host with Slackware 14.2 guest. Here the relevant configurations: Configuration to start the bridge: /sbin/brctl addbr lxcbr0 /sbin/brctl setfd lxcbr0 ...
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KVM guest using network bridge causes packet loss on host

I'm running Gentoo with libvirtd. The host is using a bridge for the guests to attach to. When starting a KVM guest, the host starts experiencing a lot of packet loss. The guest is using virtio for ...
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IPv6 not working with vmbr0

Here are my configs: Host: > ip -6 route show dev vmbr0 2a01:4f8:141:54d8::/64 proto kernel metric 256 pref medium fe80::/64 proto kernel metric 256 pref medium - iface enp30s0 inet6 static ...
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Public IP not resolving

I have a Debian/Proxmox sever running and trying to add a public IP which is not resolving and im trying to figure out if its a config issue or out IT network infrastructure (which we do not manage) ...
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Cannot ioctl TUNSETIFF tap0: Device or resource busy (errno=16)

I'm having this weird issue that when I run bridge-start together with openvpn, the service won't start. If I don't let openvpn run bridge-start, and add the necessary interfaces (tap0, br0) manually (...
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Network data/bandwidth accounting on a VM's network from the host/hypervisor side (libvirt/KVM, bridged networking)

On a server a few KVM/libvirt virtual machines are running. Sometimes these use lots of GB in network bandwidth. I would like to do statistics on network transfers (bandwidth usage, ideally by IP ...
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Two Cisco routers connected through BVI (Bridge Group Virtual Interface)

I have two Cisco 1921 routers which are now connected with VPN Tunnel. Now I want to connect them with a BVI (Bridge Group Virtual Interface). I have a dedicated link from my carrier. My problem is ...
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568 views

How to create a non-nat lxd network bridge (using lxd network)?

How to create a non-nat lxd network bridge? I have tried the below network configs, then ran sudo service networking reload and lxc stop and lxc start for the container in question. I was unable to ...
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332 views

Linux/Ubuntu bridge causes tcp retransmission and DUP ACK

When I do configure a network bridge on my Ubuntu server I got each packet to be retransmitted and getting many duplicate ACKs... as this wireshark image my bridge interface config is: iface enp5s0 ...
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How to make apache in LXC debian container accessible on QNAP QTS 4.3.4

I recently bought a QNAP TS-431P2, running QTS 4.3.4.0537. I installed Container station and from there the debian-jessie-armhf:latest lxc container. I can access the internet from within the ...
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Network bridge different subnets (Docker / Kubernetes)

I'm a little bit confused with the use of network bridges in docker / k8s setups. My understanding is that a network bridge operates exclusively at layer 2 and is used to combine 2 network segments ...
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119 views

2 virtual interfaces on the same vlan

I have one vlan with id 30. The VLAN interface on the host is eno1.30. I need two bridges to access this VLAN. Can I create a new virutal interface on the same VLAN in the same machine and add the ...
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What is the term for assigning multiple IP addresses to single NIC within the same network?

I've been looking for the term used to define the process of assigning multiple IP addresses to single IP address. A similar term that I found so far is Multihoming but, this isn't quite what I'm ...
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How can I forward all ARP requests to bridge interface?

I have debian linux machine directly connected with one NIC to ISP as host with the following interfaces auto eth1 iface eth1 inet manual auto vmbr1 iface vmbr1 inet manual bridge_ports eth1 ...
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QEMU Network bridging for having a public IP

I simply want that my QEMU VMs have a public IP so I can run multiple servers in the same machine. I've read a lot of wikis, guides, tutorials, forum threads and anything related to this but still no ...
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in shorewall, how can I block requests from external hosts when using nested zones?

I have one Debian server with one network interface, I've configured a bridge for KVM and shorewall with two zones in the same interface so I have the "net" zone and the "kvm" for kvm guests, here is ...
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Unable to ping from bridge interface(br0) to another subnet interface IP in Oracle Virtual Box VM

I am newbie to networking and trying to ping from bridge interface to another interface configured with different subnet IP address. I am trying these configuration in oracle virtual BOX VM running ...
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OpenVPN Bridge Comset Modems Setup Advice

I have 2 Comset CM685 modems and would like to setup a VPN between them which will allow both the lans to communicate to each other, i have setup OpenVPN as a bridge, one as a server the other as a ...
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Synchronize states of bridge interfaces

We have redundant 10G fiber links to our upstream internet provider in an active/failover configuration. Between our router and the upstream router, we have a pair of firewalls running Vyos in ...
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Unable to bridge two ethernet interfaces

My /etc/network/interfaces file looks as follows # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback auto enp0s3 iface enp0s3 inet dhcp auto enp0s8 iface enp0s8 inet ...
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KVM Bridge comparable to VMWare virtual switch

I have 4 physical NICs, one I have made a bridge already; ifcfg-bridge1-en1 ifcfg-enp2 ifcfg-enp3 ifcfg-enp4 Each of those NICs are different VLANs and Subnets. VLAN 24, 101, 102 ...
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Joining vlans by bridges

What anomalies might happen if you try to join a bunch of vlans by bridges in a cluster of Linux servers? We'll presume, you have a group of servers doing running VMs (qemu-kvm), these VMs have their ...
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216 views

splitting tagged and untagged traffic to bridges on KVM

I am using RHEL 7.3 KVM I have one interface that has both tagged and untagged traffic. I am looking to split the traffic to 2 bridges. so untagged traffic goes to br0 and tagged will go to br0:XX. ...
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156 views

Bridging two tap interfaces

I am a total noob, this is my first ever experiment with kernel networking. I am attempting to create a bridge between two tap interfaces, and try to send traffic through. It is more of an experiment ...
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32 views

Linux access point as tunnel splitter

Since at my workplace they use Cisco VPNs (AnyConnect protocol) to reach production and test servers, i need to be always connected to work on those servers. The problem is that the VPN doesn't ...
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96 views

Two interfaces on same network with bridge

I have qemu hypervisor that has 2 physical interfaces. eth0 is used for the host's traffic (management) and eth1 has no IP and is part of br0 along with the VM's tap interfaces. Both physical nics are ...
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519 views

Use 5 static IP addresses without NAT on hosts behind router behind Comcast Business IP Gateway

I have a VyOS router. VyOS is an OSS fork of Vyatta pre-Brocade/pre-Ubiquiti EdgeRouter. It has a DMZ fronting several servers that face the public and a private zone fronting our private WiFi and ...
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197 views

Debian network bridge stopped working

I'm using Debian Stretch and QEMU / virtmanager to run virtual machine. To give the virtual machine a network, I created a bridged like so # The loopback network interface auto lo iface lo inet ...
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Where do packets go when the destination is the IP of a bridge?

A Linux host I'm working on has a bridge with multiple virtual Ethernet adapters as members (one for each Docker container on that host). The bridge itself has an IP (172.18.0.1). When I do a ...
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435 views

Why is a physical interface not part of the docker_gwbridge?

When I look at the docker_gwbridge, I see that all containers on that host are members of the bridge. bridge name bridge id STP enabled interfaces docker_gwbridge 8000....
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666 views

Configure qemu-system for using host side virtual bridge

I'm going to run the following setup with qemu-system as hypervisor: Hostsetup: Hypervisor machine (Ubuntu 16.04) Second Machine qemuVm--tap0--br123--eth0--|Hardware hub|--eth42--SecondPC ...