Questions tagged [bridge]

A network bridge is a network device which transparently forwards packets between two or more network segments so that they appear as one local area network (LAN).

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Multiple links between bridges on different VLANs and STP

I've got two bridges with two pairs of virtual ethernet devices joining them to different VLANs. The setup looks something like this: Or in text form: $ brctl show bridge name bridge id STP ...
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No Carrier error when creating tap Interface for KVM Bridge

I have tried to create tap interface (tap210i0) manually for kvm. But each time the Tun device shows NO-CARRIER. I have interfaces eno1, eno2, vmbr0 and tap210i0. eno1 and eno2 are slaves for vmbr0. ...
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Bridge WLAN and LAN transparently

I have a range extender on one side of the house but it gives out really poor signal and looks to be slowly dying. I have a spare UniFi AP that I want to use but no Ethernet connection on that side ...
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Bridging a Wifi access point to a VPN connection

I have a computer running Debian that I would like to use as a wireless access point for sharing that computer's ethernet internet VPN connection. I can setup my openvpn based VPN software on my ...
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Bridge port VLAN tagging

I have two bridges configured. I'm trying to add a veth pair between them, configured so that untagged traffic on one bridge is carried on the other bridge with VLAN tag 5. So far I have this: $ ...
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Linux bridge for virtual machines not forwarding IP packets (but is forwarding ARP)

Kernel: 5.5.8-arch1-1 I am trying to get virtual networking working using a bridge attached to my physical interface. This is a typical setup, I'm not even trying to do anything weird. Bridge: br0 ...
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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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Virtualbox's Bridging to a real bridge stopped working

I'm using latest VirtualBox 6.1.4 r136177 (Qt5.11.3) from the oracle repositories in Debian 10. I have the following setup on my host: # /etc/network/interfaces auto br0 iface br0 inet static ...
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54 views

Please help understanding linux bridge interfaces

My objective is simple, I want to use my Ubuntu server which has one physical ethernet interface as a bridge networking device to which, so that my VMs can attach to it and talk to other devices on ...
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14 views

Host cannot connect to Internet but Guest VMs can

I don't know if this is a question is more suited for this site or askubuntu, but here's my situation: Running 18.04 Ubuntu and I made a bridged interface to allow my VM to share the connection. Now ...
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Openvswitch and libvirt..root or nothing?

I usually use the Linux bridge with libvirt. I never use root, I only add my user to libvirt-qemu(or qemu) user, and kvm group. I can run Virtual machines without problems. If I use openvswitch bridge,...
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Fedora 31 and openvswitch bridge with network-manager…no way?

Fedora-31 consider the network-scripts package deprecated(is already possible to install it but they warn you to migrate to network-manager). So I use Network-Manager(of course the ovs plugin is ...
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How do I create a network bridge between WLAN and Ethernet on FreeBSD?

I have a nice not-too-old laptop and I'm running FreeBSD 12.1 Stable on it. I want to share my internet connection from my Wireless card to whatever I connect to the Ethernet slot on this computer. ...
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Linux Mint - Intel 82579LM NIC and Hardware Unit Hang

A few months ago, I installed Linux Mint 19.1 x64 on a system with a Supermicro X9SCM system board. The X9SCM has two integrated NICs: Intel 82574L Gigabit Network Connection Intel 82579LM Gigabit ...
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How do I fully forward traffic from wlan0 to eth0 on Raspbian 10?

I'm posting here because this seems like a general Debian/Ubuntu issue, and not a Raspberry pi-specific issue. I want to bridge my wlan0 and eth0 ports on my Raspberry Pi (Raspbian 10/Buster), so ...
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Xen on Ubuntu 18.04 with IPv4 (without NAT) and IPv6

similar to the Xen on Ubuntu 18.04 with IPv4 (with NAT) and IPv6 I try to set up the netplan configuration for XEN from ubuntu 18.04 with multiple public IP addresses. So far my configuration looked ...
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Firewall (iptables) with host-shared bridge and containers

I have configured LXC container with a host-shared bridge. The host is a debian server. The bridge configuration look like this : auto br0 iface br0 inet dhcp bridge_ports eth0 ...
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UML and ethertap: what I miss?

I want to run my UML istance with network In the host machine I create the script USER=myname BRIDGENAME=br0 tunctl -t tap0 -u $USER ip link set tap0 up /usr/sbin/brctl addif $BRIDGENAME tap0 ip addr ...
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Question on L3 'pseudo-bridge' implementation for Raspberry Pi 4B

We have implemented, on the Raspberry Pi 4B, a L3 "pseudo-bridge" using Proxy ARP (parprouted) under the static configuration guidance given by user Ingo found here to provide a local database to our ...
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137 views

How to have two different gateways on two different bridges in Proxmox VE

We have two different network interfaces eno1 and eno2 (eno3 and eno4 are not connected) and we have one bridge vmbr0 we want to add another bridge vmbr1 and we want to set two different gateways on ...
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97 views

NAT and complex bridge configurations

I have a complex bridging configuration, which looks like this: There is a default route via 172.31.0.1 dev eth0_bridge. Now I'm trying to set up masquerading between lan_bridge and eth0_bridge so ...
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682 views

Linux VLAN-aware bridges and trunk ports

I have an ethernet port attached to a bridge: $ brctl show bridge name bridge id STP enabled interfaces eth0_bridge 8000.6a612bcc4723 yes eth0 The bridge is VLAN-aware (ie /sys/class/...
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Freenas Bridging networks

Apologies if this has been asked before: I have 2 networks, msk1 = 192.168.0.0/24 (DHCP) msk0 = 172.10.30.0/24 (STATIC) Each picked up the correct IP Address: msk0 172.10.30.5/24 msk1 192.168.0.9/...
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Bridged network on Kali Linux in Virtualbox

So I'm running a Kali Linux 2019.4 Distro in a Virtualbox 6.0 VM on my Lenovo Thinkpad X1 Carbon 7th Gen. The problem I encountered with the bridged network mode in Virtualbox is the following: When ...
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4G LTE Device [USB Tethering]--> Raspberry Pi [Ethernet]--> Router, is this possible?

Ok, some background info first: 1) I run a Debian fork (Netrunner Blackbird, right now) for my daily and this has allowed me to get fairly comfortable with Terminals (Konsole on KDE, mostly)... 2) I ...
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Linux: One interface receive or send both taged and untaged traffic

I want to configure a virtual interface to send and receive the traffic with a VLAN-tag of 3000. And configure other virtual interfaces to send and receive the Ethernet traffic without any VLAN-tag. ...
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164 views

Theoretical: TAP interface w/ WIFI parent interface

I'm trying to create multiple Linux TAP interfaces and allow them to send/receive packets over a single WIFI adapter. For all intents and purposes I'd like the TAP interfaces to act as full fledged ...
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28 views

How to connect to a bridge in an VMWare image?

I have a bridge running in a VMWare image. I would like to have the host (where the VMWare image is running) to be able to connect to the bridge, so that the host can access the resources running ...
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205 views

How to disable ipv6 when bridge module is required?

In linux, if you need to bridge NICs, bridge module will be loaded automatically. But one of bridge's dependency is ipv6. Is there any way to overwirte ipv6 dependency since I only need ipv4? I ...
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125 views

docker container install breaks DHCP for machines behind existing bridge interface on that machine

My initial state is something like this: A "normal" home network with a residential gateway that hands out DHCP addresses to a combination of wired and wireless machines on subnet 192.168.15.0/24. A ...
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I can ping across namespaces, but not connect with TCP

I'm trying to set up two network namespaces to communicate with eachother. I've set up two namespaces, ns0 and ns1 that each have a veth pair, where the non-namespaced side of the veth is linked to a ...
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2k views

Bridged interfaces and VLAN tags

I'm trying to set up a system that joins an untagged Ethernet network to a TAP tunnel, adding a VLAN tag as the traffic moves to the tunnel. So far I have: eth0 - the physical Ethernet interface ...
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How configure TAP, bridge for container to receive all network traffic ? Like IDS inside container

1 - container is configured with bridge (br0) 2 - All network trafic is received by the br0. And I would like that trafic is also send to my container which is under LCX. I have to use TAP because ...
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33 views

Unable to reach network from host systems (guest systems are working)

After updating my server to the latest version of Xen (4.11.1 on Debian) I don't have a working internet connection on my host system (the guest systems have access). I'm not really sure if the ...
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130 views

Linux Bridge (brctl) not passing the traffic

I created the below config: /* Created a Linux bridge and brought it up */ brctl addbr AnaBr4 ifconfig AnaBr4 up /* Created a tuntap interface and brought it up */ ip tuntap add name Xr1 mode tap ...
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60 views

Configuring a bridge leads to losing connection

I have a Linux server with three NIC that are connected to a switch (one NIC is the management, two NIC form a LACP bonding). In addition I need to use a VLAN (167), because the switch is configured ...
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272 views

Why does adding an interface to a bridge disconnect the interface (for good)?

I was playing around with vagrant-libvirt and wanted to bridge my virtual machines to my LAN so that they get a DHCP lease and are reachable from the network. Since vagrant-libvirt does apparently not ...
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why linux bridge learns source mac from lldp packets

when an LLDP packet is received, linux bridge adds the source mac to FDB. In function br_handle_frame(), case 0x0E: /* 802.1AB LLDP */ fwd_mask |= p->br->group_fwd_mask; ...
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Unable to successfully setup bridge interface with Netplan, in order to support guest OS with KVM

First of all, I would like to apologize for my bad English. I usually find an answer after a few hours, days or even weeks of research, but today, I feel quite lost and would appreciate some help. ...
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131 views

iptables: How to pass through traffic to VM (no NAT)

I have a new VM via QEMU/KVM which has its own public IP address 7.7.7.7 on my server which has 5.5.5.5 (obviously simplified for this Question). All connections work with the configuration below if ...
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99 views

KVM, qemu, libvirt no DHCP on bridge

After I restart firewall on the host machine, I no longer get DHCP on guests until I restart libvirtd.service I am providing two network captures, one before restarting FW on the host (dhcp_ok.pcap) ...
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27 views

Connect a bridge interface from other machine

this is my first post, sorry for any inconvenience. I want to link a bridged interface from another machine to my laptop. So that any packets sent from my laptop can be sent both interfaces from the ...
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60 views

ovs-vsctl: Error detected while setting up 'eoip_if'. See ovs-vswitchd log for details

I have a namespace ns1, inside this i run a eoip script which create a interface eoip_if. I also have a ovs-bridge br0 which is in default namespace. When i try adding the 'eoip_if' interface as a ...
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Get Originating device(physical device) info for Packets trapped on Bridge

Lets assume below given is the set of net devices that my frame is intended to traverse over. eth0(1) -> bond0(2) -> bridge(3) -> vlan100(4). >>> (number) is the ifindex for each netdevice I have ...
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How can I view which ports are blocked and why the other ports are activated on a Linux Bridge?

This was one of the questions I had on an exam about computer networks (translated from dutch). The answer should be one single command.
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Creating a bridge to connect a router and a proxy server

There is a proxy server which I have no control over. It is completely blocked and firewalled. I want my device to connect to the internet through the proxy without having to enter the proxy details. ...
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699 views

how remove an interface from bridge?

For some reason, we noticed two physical interfaces (eth0, eth3) are under the same bridge vmeth0. We need to remove eth3 from vmeth0 bridge without affecting the rest of the configuration. Please ...
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Configure KVM in Debian 9 and bridge network remove Wi-Fi and not working

I'm trying to install and configure KVM in Debian following this guide. When I restart the network after configuring /etc/network/interfaces.d/br0 my wi-fi connection goes off. I've noticed that if I ...
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156 views

FreeBSD rc.conf not adding lagg group to bridge on system start up or service restart

I am not sure what I am doing wrong here. I have the following configuration in my /etc/rc.conf on my (personal) server. cloned_interfaces="bridge0 lagg0" ifconfig_igb0="up" ifconfig_igb1="up" ...
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Is it possible to “bridge” my laptop's wlan and eth so eth behaves as if it's connected to the router directly?

Here's a crude picture of what I mean. Basically, I need that device in the bottom left to be visible to the PC 1 as if it were connected to the router directly (dashed line). Physically it is ...

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