(How to) Sending Packets Between Different VLANs

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Discussion Overview

The discussion revolves around the process of sending packets between different VLANs (Virtual Local Area Networks). Participants explore various methods and technologies involved in inter-VLAN communication, including the roles of switches and routers.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant outlines their understanding that packets are sent within VLANs using switches, which maintain a MAC address table, and questions how packets are sent between VLANs.
  • Several methods for inter-VLAN communication are proposed, including trunking, using layer-3 switches, and utilizing routers with a single interface.
  • Another participant suggests that the question encompasses both physical and functional aspects of VLAN communication and recommends a tutorial as a resource.
  • Some participants express confusion regarding the intent of the original question, questioning whether the user is attempting to implement inter-VLAN communication.
  • One participant suggests that downloading a manual for a compatible router could provide straightforward guidance on VLAN routing.

Areas of Agreement / Disagreement

There is no clear consensus on the best method for sending packets between VLANs, and participants express varying levels of understanding and curiosity about the topic.

Contextual Notes

Some limitations include potential missing assumptions about the network setup and the specific capabilities of the devices being discussed, as well as the need for clarity on the functional rules governing VLAN communication.

WWGD
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Hi all,
Please critique my attempt to understand the n
I'm trying to understadand the process of sending packets between different VLAns
My understanding is that packets are sent within Vlans by using switches. Packet is sent to switch , which has a
table listing pairings of MAC addresses with their assigned IPaddresses. If the IP address of the recipient is not known,
the switch will issue a broadcast.

But, how are these packets sent between VLAns?
From my reading, I gather the main options are:
1) Trunking . This consists of a physical link between the VLAns.
VLAn 1 will then encapsulate additional information in the packets, which will be stripped away by the trunk,
and relayed to VLAn 2

2) By using some special layer-3( Re OSI model) switch that is able to
connect different VLAns .

3) Using regular old routers, with a single interface?

Is this accurate?

Maybe @Svein would know?
 
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Your quesition seems to span both the physical and functional aspects. This tutorial seems pretty popular. It might be a good match for your questions.

 
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I'm puzzled by the question - are you trying to do this? Your router/managed switch let's you - or should let you - define VLANS and the rules for passing packets between them.
 
Vanadium 50 said:
I'm puzzled by the question - are you trying to do this? Your router/managed switch let's you - or should let you - define VLANS and the rules for passing packets between them.
I'm just curious.
 
Probably best then is to download a manual for a router that supports it. It's preety straightforward - VLANs get routed more or less like other packets.
 

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