(How to) Sending Packets Between Different VLANs

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SUMMARY

This discussion focuses on the methods for sending packets between different VLANs (Virtual Local Area Networks). The primary techniques identified include trunking, which involves a physical link that encapsulates VLAN information, utilizing layer-3 switches capable of inter-VLAN routing, and employing traditional routers with a single interface. Participants confirm that routers and managed switches allow for the configuration of VLANs and the rules governing packet transmission between them. A recommended tutorial is mentioned as a helpful resource for further understanding.

PREREQUISITES
  • Understanding of VLAN concepts and configurations
  • Familiarity with OSI model, particularly layer-2 and layer-3 functionalities
  • Knowledge of networking hardware, specifically switches and routers
  • Experience with packet encapsulation and transmission protocols
NEXT STEPS
  • Research VLAN trunking protocols, such as IEEE 802.1Q
  • Learn about configuring layer-3 switches for inter-VLAN routing
  • Explore router configurations for VLAN management and packet routing
  • Review tutorials on VLAN setup and troubleshooting
USEFUL FOR

This discussion is beneficial for network engineers, IT professionals, and anyone involved in configuring and managing VLANs and inter-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?
 
Last edited:
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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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