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Questions tagged [bridge]

Network bridging describes the action taken by network equipment to allow two or more communication networks, or two or more network segments, to create an aggregate network. Bridging is distinct from routing which allows the networks to communicate independently as separate networks. A network bridge is a network device that connects more than one network segment. In the OSI model bridging acts in the first two layers, below the network layer.

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How does Kismet find WIRED devices when scanning Wi-Fi? [closed]

In an effort to better secure my Wi-Fi network by finding its weaknesses and mitigating them, I have employed the use of Kismet, a well known Wi-Fi security scanning tool. When I use Kismet to scan ...
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What is the bridging decision when getting ARP request?

Setup: Assume I have 3 VMs. VM1 VM2 and VM3. VM2 has two interfaces, say eth1 and eth3. eth1 is connected to VM1 physically and eth3 to VM3. I create a bridge on VM2 using brctl with eth1 and eth3. ...
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Does bridging add delay?

If I use a bridge to perform traffic sniffing like man in the middle will the bridge add a delay? And what word should I use delay or latency?
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472 views

Bridging networks without NAT: how it's done?

I have quite limited networking experience, so probably i'm asking about very simple things. I'm reading about linux bridge interfaces, and documentation states that there is no NAT by default and ...
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3answers
505 views

Force VLAN traffic through specified interfaces

I have two VLANs, VLAN1 for "clients" and VLAN2 for (web)servers. Both VLANs have two ports in etherchannel (one Cisco switch). I would like to put transparent (WAF) device in bridge mode between the ...
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1answer
241 views

How can I prevent VLAN bridging on a Cisco switch

A Cisco switch (IOS) on our network configured with VLAN 7 and VLAN 8 as access VLANs (7 being the native for the trunk on the switch) had the VLANs bridged by someone who connected a patch cable from ...
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1answer
36 views

Does bridge store ARP reply information?

In above picture, D is sending packet to E and bridges B1,B2,B3,B4 have no forwarding entries. Firstly, D sends packet to B3 nad B3's forwarding table is updated. B3 sends packet to B2. Therefore, B2'...
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2answers
217 views

Cisco Catalyst 3850 router VLAN bridge no routing

New to Cisco stuff so bear with me (only a little L2 Procurve experience). I have a development network connected to an Aruba/HPE managed switch feeding a trunk with tagged VLAN's to an internal ...
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1answer
9k views

Difference between Linux Bridge and Open vSwitch

What are the most significant differences between how a Linux bridge and an Open vSwitch work?
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2answers
2k views

Difference between Switch and Linux Bridge

In my network, I need some manageable switches. So, somebody advised me to configure the Lab Linux servers as bridges using brctl. Those new bridges should act like switches. What should be the ...
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1answer
373 views

Accessing Internet from a different VLAN. Cisco 200-26

I have just had a cisco 200-26 smart switch with 24 ports. I have set the IP of VLAN1 (also management Lan) to 192.168.1.254. All ports except port 10 and 11 are assigned to VLAN1. Furthermore, I have ...
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5answers
217 views

What is a VLAN (really)?

My question is about the literal and precise meaning of the term "VLAN". According to IEEE 802.1Q-2014, a LAN is a single segment of a medium. A cable connecting a PC to a switch port is a single LAN. ...
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1answer
590 views

What is WDS and how can it cause a broadcast storm?

Recently I was told that we leave WDS off ,whenever we can, where I work. It was explained to me that a broadcast storm is created when a routers' broadcast gets back to itself, perpetuates itself and ...
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605 views

Connect to wireless network on different subnet

I have a lift motor that has an app that allows me to move the lift up and down. The lift creates its on Wi-Fi network with a default gateway of 192.168.4.1 My existing network is 192.168.1.1, I have ...
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1answer
36 views

Discovering public ip from wifi signals, shodan, parent router NAT [closed]

MAC addresses innately do not change right? and you're able to scan for broadcasting APs where you'll be able to detect different nearby mac addresses of each AP.. Public IP addresses change, ...
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2answers
414 views

PAgP over transparent wireless point-to-point links

We have 2 buildings which are interconnected by 2 wireless P2P links. One is used as main connection, the second one is for redundancy and backup. So far, we have these 2 buildings in flat L2 network ...
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1answer
2k views

Cisco ASA and BVI interfaces

I'm in the middle of equipment migration and the setup is somewhat similar to Mike's (Configure Cisco ASA in Transparent mode: Layer2 DMZ w/ Vlan translation) but with a difference that I need the ...
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2answers
773 views

How to make virtual devices on GNS3 be able to ping the physical host

I have had this problem already and figured out its reason. Basically the problem is that the virtual devices on GNS3 cannot ping the physical host and also the physical host cannot ping the virtual ...
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1answer
35k views

Difference between gateway, router, switches and bridge

I am going through a course of networking and want to know the difference between the mentioned devices. I have heard that the switches: Establish a temporary connection between the devices connected ...
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1answer
994 views

Can a Bridge forward frames with the destination as broadcast/multicast

I have a question regarding multicast and broadcast frames on a network bridge. Will the bridge forward these frames from one network segment to another network segment ?
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1answer
148 views

How can I bridge multiple interfaces to a single one a Cisco ISR C891F but making each one able to communicate only to the destination interface?

As the question says: How can I bridge multiple interfaces to a single one on a Cisco ISR C891F, but making each one able to communicate only to the destination interface? Let's say I have ...
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1answer
351 views

Phone and PC network sharing one wifi bridge

We have a Cisco router from our T-mobile provider, two subnets on two ethernet ports: one subnet for PC data network, one subnet for IP phone network. The subnets have different IP addressing. As per ...
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2answers
333 views

How can I access switch port protected by 802.1X thats in a seperate collision domain seperated by a T1 bridge

I want to be able to remotely access an Ethernet switch-port protected by 802.1x. The switch I want to access is at a distant site, but I have a T1 circuit that goes from that site to my office. I ...
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2answers
1k views

How transparent bridging Wi-Fi with Ethernet works?

The way I understand (two-port) transparent bridging is that the bridge simply forwards packets to another segment on the network. But since the MAC address of the ethernet interface is different to ...
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1answer
495 views

Cabling two access ports on the same switch from different VLANs

Theoretically would I be able to connect two switch ports together with a simple straight/cross cable on the same switch. If the two ports are in different VLANs (eg. 2 and 22) and ports are in ...
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1answer
25k views

MikroTik - problem with port bridge over LAN using 2 switches [closed]

I have RB2011UiAS-2HnD-IN router in my network. It has two switches - "switch1" with 5 x 1Gb ports and "switch2" with 5 x 100Mb ports. There is only one LAN addressing pool - 192.168.1.0. All 5 ...
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3answers
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Can a mikrotik 750GL have the same IP as the DSL router connected in a different port? [closed]

On a simple network of about 10 computers setup with static IPs in the 192.168.1.x range, the ISP's DSL router occupies 192.168.1.1. All computers and the router physically connect to a simple network ...
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1answer
19k views

Configurating VLAN access and trunk ports on RouterOS/Mikrotik [closed]

I have RouteBOARD RB951G-2HnD, RouterOS 6.34.2 and I am trying to achive a network configuration something like what is depict on the next picture. The picture is from Mikrotik Wiki http://wiki....
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1answer
143 views

Wifi ap bridge WLAN network with WAN network

Googling "WLAN Bridge" mostly gives results about WDS bridge (wifi device to wifi device communication) What i want to do is basically bridge the router's WLAN and WAN interface (disabling NAT, ...
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1answer
52 views

Cisco ISO - Are all interfaces assigned to bridges automatically?

I'm currently looking at configuring a second bridge on a cisco switch, however it appears that all interfaces are 'automatically' in the first bridging interface because they are part of Vlan1, which ...
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2answers
259 views

Cisco 1841, Bridge T1 WAN to hosts with public IPs?

We currently have a Samsung router given to us by Covad. It is configured like this: PPPoFR T1 WAN (samsung router) x.x.x.49/29(public address) gateway ...
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1answer
38 views

How to access to virtual interface with static IP thanks to VPN?

Question : Is it possible to use a VPN solution to access to a remote PC in the following context ? Context : Objective : We need to connect a specific software (that uses a particular port) to a ...
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2answers
191 views

Bind IP To Port

I have a Cisco 877 router, running IOS Version 12.4(24)T3, with 4 Ethernet ports and multiple external IP address attached to the internet connection. I usually just nat the external addresses to ...
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3answers
3k views

Advice for network & device configuration using Comcast Modem?

Summary My ultimate goal is to run a VPN through my Cisco Router, which to me means getting the Comcast Gateway out of the way. To this end, I would like to place my Cisco Router (and/or Switch) ...
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1answer
211 views

Cisco router under workgroup bridge AP

My question is about addressing a Cisco router interface so that I can use both bridging through an access point as workgroup-bridge and also connect to the access point to configure it. Apologies ...
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2answers
391 views

WLAN Bridge connected over WLAN to the internet

I need to establish a WLAN Bridge over a distance of approximately 400m. I found this equipment: https://www.ligowave.com/products/apc-propeller-2 As I understand it needs to connect over LAN to the ...
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1answer
316 views

Can a network bridge be viewed as a two port switch?

I never worked with bridges because they were no longer used when I first got internet at home, and I have some troubles understanding what exactly was the role of the switches. From my search I ...
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2answers
67 views

Working of bridges not making sense

I am reading the book on Data Communications and Networking by Behrouz A. Forouzan Suppose a device A on LAN 1 wants to connect to the device B on LAN 2 . Initially the bridge table is empty . ...
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1answer
752 views

Bridge for collision domains

I have read that a bridge/switch can be used to increase the number of collision domains in the network, but somewhere I also read that a bridge reduces collision domains. Is it possible for bridge to ...
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3answers
509 views

Is there an “active” network tap (not just passive)? [closed]

Passive network taps seem to be pretty simple. What if I want an "active" network tap? Let's say I want to change some HTTP packets, for example add info etc. Another thing that would interest my ...
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2answers
184 views

Join internal networks

we've expanded our business to a nearby building with its own network and i am trying to join the two so that the workstations can see each other, but they continue to use their own internet access. ...
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2answers
78 views

What is EB (Ethernet Bridge)? [closed]

I'm new to centos and networks and I was reading documents about how to use direct commands on centos7 firewall-cmd using man 1 firewall-cmd I saw this line: The first argument of each option has ...
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1answer
692 views

Merging two networks

I am new to networking and I want to understand how to merge (bridge) two networks and what all things (parametres) change when the nerworks are merged. Can somebody explain more in an educational way?...
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1answer
608 views

Cannot bridge point-to-point between autonomous AP and lightweight AP

I'm doing some tests in a company, and I have some problems. My mission is to configure an autonomous AP Cisco AIRCAP-2602E, and do a Wi-Fi bridge point-to-point between a Cisco lightweight AP and ...
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2answers
4k views

Understanding Linux Bridging

I am trying to understand Linux bridging. Lets say I have a Linux bridge with two veth interfaces and a vNic. Bridge: br0 Interfaces: veth1, veth2, and eth1 Now, if I do brctl showmacs br0, it ...
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1answer
1k views

Use iperf to split multiple tcp streams between 2 NIC on same client (similar to IxChariot)

I have 2 PCs connected to each other using two 1 Gbps ethernet link, to have an aggregate data bandwidth of 2 Gbps. In IxChariot, I can create multiple TCP pairs and split them into: PC1_LAN1 <-&...
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1answer
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Bridge two QinQ interfaces on a juniper router

On a Juniper MX router I've got 2 interfaces that I need to bridge together. Interface A has QinQ configured: vlan-tags outer 0x8100.1 inner 0x8100.600 Interfaces B has QinQ configured vlan-tags ...
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1answer
295 views

Regarding Bridge domain and L2 vpn

I am trying to understand the usage of bridge group command.Please refer the following config(on switch ASR9k): l2vpn ! bridge group TEST1 bridge-domain BD1 interface Bundle-Ether1.500 ...
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1answer
115 views

Different between VLAN broadcast behavior on a Cisco switch and a Linux bridge

When will a packet be tagged/untagged with a VLAN tag in these cases: On a Cisco switch On a 8021q subinterface in Linux (for example, eth0.10) On VMWare ESXi (with VLAN ID in VMNetwork setting) ...
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4answers
218 views

How, if possible, extend WiFi network over Internet?

sorry if my terminology is way off, I'm not well versed with networking. Can any combination of hardware and software make following scenario a reality: In location A there is a WiFi network called, ...