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 6 hours ago
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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 6 hours ago
Cown
6,90631031
asked 9 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 6 hours ago
Cown
6,90631031
asked 9 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 6 hours ago
Cown
6,90631031
asked 9 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 6 hours ago
Cown
6,90631031
asked 9 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 6 hours ago
Cown
6,90631031
edited 6 hours ago
Cown
6,90631031
edited 6 hours ago
Cown
6,90631031
6,90631031
asked 9 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 9 hours ago
Jon StinnettJon Stinnett
61
asked 9 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.
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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 9 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 6 hours ago
Cown
6,90631031
answered 8 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 9 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 9 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 9 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 9 hours ago
Zac67Zac67
32.6k22163
edited 4 hours ago
answered 9 hours ago
Zac67Zac67
32.6k22163
answered 9 hours ago
Zac67Zac67
32.6k22163
answered 9 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 6 hours ago
Cown
6,90631031
answered 8 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 6 hours ago
Cown
6,90631031
answered 8 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 6 hours ago
Cown
6,90631031
answered 8 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 6 hours ago
Cown
6,90631031
answered 8 hours ago
Ron TrunkRon Trunk
39.5k33780
edited 6 hours ago
Cown
6,90631031
edited 6 hours ago
Cown
6,90631031
edited 6 hours ago
Cown
6,90631031
6,90631031
answered 8 hours ago
Ron TrunkRon Trunk
39.5k33780
answered 8 hours ago
Ron TrunkRon Trunk
39.5k33780
answered 8 hours ago
Ron TrunkRon Trunk
39.5k33780
39.5k33780
add a comment |
add a comment |
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