Do VLANs within a subnet need to have their own subnet for router on a stick?
I have been creating a network lab in packet tracer for practice. I have 3 vlans in subnet A and I am trying to configure router on a stick at gig6/0 on the bottom left of the image. Do I need to create a subnet for each VLAN in order for the router on a stick gateway to work?
router vlan subnet trunk gateway
edited 11 hours ago
Cown
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asked 14 hours ago
Jon StinnettJon Stinnett
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I have been creating a network lab in packet tracer for practice. I have 3 vlans in subnet A and I am trying to configure router on a stick at gig6/0 on the bottom left of the image. Do I need to create a subnet for each VLAN in order for the router on a stick gateway to work?
router vlan subnet trunk gateway
edited 11 hours ago
Cown
6,90631031
asked 14 hours ago
Jon StinnettJon Stinnett
61
New contributor
Jon Stinnett is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I have been creating a network lab in packet tracer for practice. I have 3 vlans in subnet A and I am trying to configure router on a stick at gig6/0 on the bottom left of the image. Do I need to create a subnet for each VLAN in order for the router on a stick gateway to work?
router vlan subnet trunk gateway
edited 11 hours ago
Cown
6,90631031
asked 14 hours ago
Jon StinnettJon Stinnett
61
New contributor
Jon Stinnett is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have been creating a network lab in packet tracer for practice. I have 3 vlans in subnet A and I am trying to configure router on a stick at gig6/0 on the bottom left of the image. Do I need to create a subnet for each VLAN in order for the router on a stick gateway to work?
router vlan subnet trunk gateway
router vlan subnet trunk gateway
edited 11 hours ago
Cown
6,90631031
asked 14 hours ago
Jon StinnettJon Stinnett
61
New contributor
Jon Stinnett is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 11 hours ago
Cown
6,90631031
asked 14 hours ago
Jon StinnettJon Stinnett
61
New contributor
Jon Stinnett is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 11 hours ago
Cown
6,90631031
edited 11 hours ago
Cown
6,90631031
edited 11 hours ago
Cown
6,90631031
6,90631031
asked 14 hours ago
Jon StinnettJon Stinnett
61
New contributor
Jon Stinnett is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 14 hours ago
Jon StinnettJon Stinnett
61
asked 14 hours ago
Jon StinnettJon Stinnett
61
61
New contributor
Jon Stinnett is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Jon Stinnett is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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2 Answers
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I'm not understanding your exact problem because you don't provide enough detail but maybe this helps:
With rare exceptions, an IP subnet is mapped to a VLAN = broadcast domain = layer-2 network on a 1:1 basis.
You can run multiple IP subnets inside a single VLAN but they need a router to communicate with each other. Most often this setup doesn't make too much sense.
You can't run a single IP subnet across multiple VLANs though (without elaborate workarounds). Nodes in the same subnet expect to be able to talk to each other on a common layer-2 network = VLAN = broadcast domain.
So, your "VLANs within a subnet" can only work when you've split that subnet into sub-subnets properly and set up the router as gateway in between. A router on a stick is a router forwarding between VLAN subinterfaces on a single physical interface. Each subinterface needs to connect to one of the desired VLANs, so the link needs to be a VLAN trunk on both the switch and the router side.
answered 13 hours ago
Zac67Zac67
32.6k22163
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Just to amplify on Zac’s answer: you have one subnet per vlan and vice versa. At the CCNA level, you can ignore the rare exceptions. The router on a stick has an (sub)interface in each subnet. Therefore all VLANs must be trunked to the router.
edited 11 hours ago
Cown
6,90631031
answered 13 hours ago
Ron TrunkRon Trunk
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2 Answers
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2 Answers
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I'm not understanding your exact problem because you don't provide enough detail but maybe this helps:
With rare exceptions, an IP subnet is mapped to a VLAN = broadcast domain = layer-2 network on a 1:1 basis.
You can run multiple IP subnets inside a single VLAN but they need a router to communicate with each other. Most often this setup doesn't make too much sense.
You can't run a single IP subnet across multiple VLANs though (without elaborate workarounds). Nodes in the same subnet expect to be able to talk to each other on a common layer-2 network = VLAN = broadcast domain.
So, your "VLANs within a subnet" can only work when you've split that subnet into sub-subnets properly and set up the router as gateway in between. A router on a stick is a router forwarding between VLAN subinterfaces on a single physical interface. Each subinterface needs to connect to one of the desired VLANs, so the link needs to be a VLAN trunk on both the switch and the router side.
answered 13 hours ago
Zac67Zac67
32.6k22163
add a comment |
I'm not understanding your exact problem because you don't provide enough detail but maybe this helps:
With rare exceptions, an IP subnet is mapped to a VLAN = broadcast domain = layer-2 network on a 1:1 basis.
You can run multiple IP subnets inside a single VLAN but they need a router to communicate with each other. Most often this setup doesn't make too much sense.
You can't run a single IP subnet across multiple VLANs though (without elaborate workarounds). Nodes in the same subnet expect to be able to talk to each other on a common layer-2 network = VLAN = broadcast domain.
So, your "VLANs within a subnet" can only work when you've split that subnet into sub-subnets properly and set up the router as gateway in between. A router on a stick is a router forwarding between VLAN subinterfaces on a single physical interface. Each subinterface needs to connect to one of the desired VLANs, so the link needs to be a VLAN trunk on both the switch and the router side.
answered 13 hours ago
Zac67Zac67
32.6k22163
add a comment |
I'm not understanding your exact problem because you don't provide enough detail but maybe this helps:
With rare exceptions, an IP subnet is mapped to a VLAN = broadcast domain = layer-2 network on a 1:1 basis.
You can run multiple IP subnets inside a single VLAN but they need a router to communicate with each other. Most often this setup doesn't make too much sense.
You can't run a single IP subnet across multiple VLANs though (without elaborate workarounds). Nodes in the same subnet expect to be able to talk to each other on a common layer-2 network = VLAN = broadcast domain.
So, your "VLANs within a subnet" can only work when you've split that subnet into sub-subnets properly and set up the router as gateway in between. A router on a stick is a router forwarding between VLAN subinterfaces on a single physical interface. Each subinterface needs to connect to one of the desired VLANs, so the link needs to be a VLAN trunk on both the switch and the router side.
answered 13 hours ago
Zac67Zac67
32.6k22163
I'm not understanding your exact problem because you don't provide enough detail but maybe this helps:
With rare exceptions, an IP subnet is mapped to a VLAN = broadcast domain = layer-2 network on a 1:1 basis.
You can run multiple IP subnets inside a single VLAN but they need a router to communicate with each other. Most often this setup doesn't make too much sense.
You can't run a single IP subnet across multiple VLANs though (without elaborate workarounds). Nodes in the same subnet expect to be able to talk to each other on a common layer-2 network = VLAN = broadcast domain.
So, your "VLANs within a subnet" can only work when you've split that subnet into sub-subnets properly and set up the router as gateway in between. A router on a stick is a router forwarding between VLAN subinterfaces on a single physical interface. Each subinterface needs to connect to one of the desired VLANs, so the link needs to be a VLAN trunk on both the switch and the router side.
answered 13 hours ago
Zac67Zac67
32.6k22163
edited 9 hours ago
answered 13 hours ago
Zac67Zac67
32.6k22163
answered 13 hours ago
Zac67Zac67
32.6k22163
answered 13 hours ago
Zac67Zac67
32.6k22163
32.6k22163
add a comment |
add a comment |
Just to amplify on Zac’s answer: you have one subnet per vlan and vice versa. At the CCNA level, you can ignore the rare exceptions. The router on a stick has an (sub)interface in each subnet. Therefore all VLANs must be trunked to the router.
edited 11 hours ago
Cown
6,90631031
answered 13 hours ago
Ron TrunkRon Trunk
39.5k33780
add a comment |
Just to amplify on Zac’s answer: you have one subnet per vlan and vice versa. At the CCNA level, you can ignore the rare exceptions. The router on a stick has an (sub)interface in each subnet. Therefore all VLANs must be trunked to the router.
edited 11 hours ago
Cown
6,90631031
answered 13 hours ago
Ron TrunkRon Trunk
39.5k33780
add a comment |
Just to amplify on Zac’s answer: you have one subnet per vlan and vice versa. At the CCNA level, you can ignore the rare exceptions. The router on a stick has an (sub)interface in each subnet. Therefore all VLANs must be trunked to the router.
edited 11 hours ago
Cown
6,90631031
answered 13 hours ago
Ron TrunkRon Trunk
39.5k33780
Just to amplify on Zac’s answer: you have one subnet per vlan and vice versa. At the CCNA level, you can ignore the rare exceptions. The router on a stick has an (sub)interface in each subnet. Therefore all VLANs must be trunked to the router.
edited 11 hours ago
Cown
6,90631031
answered 13 hours ago
Ron TrunkRon Trunk
39.5k33780
edited 11 hours ago
Cown
6,90631031
edited 11 hours ago
Cown
6,90631031
edited 11 hours ago
Cown
6,90631031
6,90631031
answered 13 hours ago
Ron TrunkRon Trunk
39.5k33780
answered 13 hours ago
Ron TrunkRon Trunk
39.5k33780
answered 13 hours ago
Ron TrunkRon Trunk
39.5k33780
39.5k33780
add a comment |
add a comment |
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