Do all network devices need to make routing decisions, regardless of communication across networks or within...
From Hunt's TCP/IP Network Adminstration:
Gateways route data between networks, but all network devices, hosts as well as
gateways, must make routing decisions.
Is it correct that routing decisions are made only for communication across different networks?
For communication within a network (whether it is in an internetwork or not),
does any device in the network need to make routing decisions?
does any device in the network necessarily have a routing table or something similar?
If a device makes routing decision, that that mean the device has a routing table or something similar? If a device has a routing table or something similar, does it make routing decision?
Or, do only gateway devices have to make routing decisions and have routing tables or something similar?
I have these questions because my Linux laptop isn't a gateway in the local wifi network, but has a routing table to my surprise. Is it cecause any device in a network has a routing table? My laptop doesn't seem to connect two networks, because the network for all the loopback addresses and the wifi network can't communicate with each other. But its routing table shows a route for communicating with other devices in the same wifi network, and a default route for all other destinations outside the wifi network.
Thanks.
routing
asked 11 hours ago
TimTim
633517
add a comment |
From Hunt's TCP/IP Network Adminstration:
Gateways route data between networks, but all network devices, hosts as well as
gateways, must make routing decisions.
Is it correct that routing decisions are made only for communication across different networks?
For communication within a network (whether it is in an internetwork or not),
does any device in the network need to make routing decisions?
does any device in the network necessarily have a routing table or something similar?
If a device makes routing decision, that that mean the device has a routing table or something similar? If a device has a routing table or something similar, does it make routing decision?
Or, do only gateway devices have to make routing decisions and have routing tables or something similar?
I have these questions because my Linux laptop isn't a gateway in the local wifi network, but has a routing table to my surprise. Is it cecause any device in a network has a routing table? My laptop doesn't seem to connect two networks, because the network for all the loopback addresses and the wifi network can't communicate with each other. But its routing table shows a route for communicating with other devices in the same wifi network, and a default route for all other destinations outside the wifi network.
Thanks.
routing
asked 11 hours ago
TimTim
633517
add a comment |
From Hunt's TCP/IP Network Adminstration:
Gateways route data between networks, but all network devices, hosts as well as
gateways, must make routing decisions.
Is it correct that routing decisions are made only for communication across different networks?
For communication within a network (whether it is in an internetwork or not),
does any device in the network need to make routing decisions?
does any device in the network necessarily have a routing table or something similar?
If a device makes routing decision, that that mean the device has a routing table or something similar? If a device has a routing table or something similar, does it make routing decision?
Or, do only gateway devices have to make routing decisions and have routing tables or something similar?
I have these questions because my Linux laptop isn't a gateway in the local wifi network, but has a routing table to my surprise. Is it cecause any device in a network has a routing table? My laptop doesn't seem to connect two networks, because the network for all the loopback addresses and the wifi network can't communicate with each other. But its routing table shows a route for communicating with other devices in the same wifi network, and a default route for all other destinations outside the wifi network.
Thanks.
routing
asked 11 hours ago
TimTim
633517
From Hunt's TCP/IP Network Adminstration:
Gateways route data between networks, but all network devices, hosts as well as
gateways, must make routing decisions.
Is it correct that routing decisions are made only for communication across different networks?
For communication within a network (whether it is in an internetwork or not),
does any device in the network need to make routing decisions?
does any device in the network necessarily have a routing table or something similar?
If a device makes routing decision, that that mean the device has a routing table or something similar? If a device has a routing table or something similar, does it make routing decision?
Or, do only gateway devices have to make routing decisions and have routing tables or something similar?
I have these questions because my Linux laptop isn't a gateway in the local wifi network, but has a routing table to my surprise. Is it cecause any device in a network has a routing table? My laptop doesn't seem to connect two networks, because the network for all the loopback addresses and the wifi network can't communicate with each other. But its routing table shows a route for communicating with other devices in the same wifi network, and a default route for all other destinations outside the wifi network.
Thanks.
routing
routing
asked 11 hours ago
TimTim
633517
asked 11 hours ago
TimTim
633517
edited 11 hours ago
Tim
asked 11 hours ago
TimTim
633517
asked 11 hours ago
TimTim
633517
asked 11 hours ago
TimTim
633517
633517
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2 Answers
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Every IP device has a routing table, and therefore makes a routing decision. It may be quite simple with only two entries, but fundamentally, a device needs to decide if the destination is on the directly connected network or not. If not, it forwards the packet to the gateway. For most devices like PCs, there is only a default gateway, but there can be more than one.
answered 11 hours ago
Ron TrunkRon Trunk
39.2k33780
1
Three entries usually. There's also localhost.
– Zan Lynx
44 mins ago
@ZanLynx You’re right. I forgot to mention that.
– Ron Trunk
41 mins ago
add a comment |
Theoretically, consider a computer that has an IP address of 192.168.1.3/24 and wants to send some data to the IP address 192.168.2.5/24 then it should make a subnet checking to see if the IP address it wants to reach is in the same network or not; to be able to decide to forward the packet to its gateway or not.
when you have a subnet mask of /24 which refers in binary to 11111111.11111111.11111111.00000000. Zeros are the places you can modify your IP address in the "same network". If you change anything before zeros start, it means you are changing the network you are in and to be able to communicate with such an IP you need a router between two of them. After all, being able to make this decision is considered as making a routing decision.
Hope the answer helps.
answered 11 hours ago
metinmetin
664
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2 Answers
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2 Answers
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Every IP device has a routing table, and therefore makes a routing decision. It may be quite simple with only two entries, but fundamentally, a device needs to decide if the destination is on the directly connected network or not. If not, it forwards the packet to the gateway. For most devices like PCs, there is only a default gateway, but there can be more than one.
answered 11 hours ago
Ron TrunkRon Trunk
39.2k33780
1
Three entries usually. There's also localhost.
– Zan Lynx
44 mins ago
@ZanLynx You’re right. I forgot to mention that.
– Ron Trunk
41 mins ago
add a comment |
Every IP device has a routing table, and therefore makes a routing decision. It may be quite simple with only two entries, but fundamentally, a device needs to decide if the destination is on the directly connected network or not. If not, it forwards the packet to the gateway. For most devices like PCs, there is only a default gateway, but there can be more than one.
answered 11 hours ago
Ron TrunkRon Trunk
39.2k33780
1
Three entries usually. There's also localhost.
– Zan Lynx
44 mins ago
@ZanLynx You’re right. I forgot to mention that.
– Ron Trunk
41 mins ago
add a comment |
Every IP device has a routing table, and therefore makes a routing decision. It may be quite simple with only two entries, but fundamentally, a device needs to decide if the destination is on the directly connected network or not. If not, it forwards the packet to the gateway. For most devices like PCs, there is only a default gateway, but there can be more than one.
answered 11 hours ago
Ron TrunkRon Trunk
39.2k33780
Every IP device has a routing table, and therefore makes a routing decision. It may be quite simple with only two entries, but fundamentally, a device needs to decide if the destination is on the directly connected network or not. If not, it forwards the packet to the gateway. For most devices like PCs, there is only a default gateway, but there can be more than one.
answered 11 hours ago
Ron TrunkRon Trunk
39.2k33780
answered 11 hours ago
Ron TrunkRon Trunk
39.2k33780
answered 11 hours ago
Ron TrunkRon Trunk
39.2k33780
answered 11 hours ago
Ron TrunkRon Trunk
39.2k33780
39.2k33780
1
Three entries usually. There's also localhost.
– Zan Lynx
44 mins ago
@ZanLynx You’re right. I forgot to mention that.
– Ron Trunk
41 mins ago
add a comment |
1
Three entries usually. There's also localhost.
– Zan Lynx
44 mins ago
@ZanLynx You’re right. I forgot to mention that.
– Ron Trunk
41 mins ago
1
1
Three entries usually. There's also localhost.
– Zan Lynx
44 mins ago
Three entries usually. There's also localhost.
– Zan Lynx
44 mins ago
@ZanLynx You’re right. I forgot to mention that.
– Ron Trunk
41 mins ago
@ZanLynx You’re right. I forgot to mention that.
– Ron Trunk
41 mins ago
add a comment |
Theoretically, consider a computer that has an IP address of 192.168.1.3/24 and wants to send some data to the IP address 192.168.2.5/24 then it should make a subnet checking to see if the IP address it wants to reach is in the same network or not; to be able to decide to forward the packet to its gateway or not.
when you have a subnet mask of /24 which refers in binary to 11111111.11111111.11111111.00000000. Zeros are the places you can modify your IP address in the "same network". If you change anything before zeros start, it means you are changing the network you are in and to be able to communicate with such an IP you need a router between two of them. After all, being able to make this decision is considered as making a routing decision.
Hope the answer helps.
answered 11 hours ago
metinmetin
664
New contributor
metin 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 |
Theoretically, consider a computer that has an IP address of 192.168.1.3/24 and wants to send some data to the IP address 192.168.2.5/24 then it should make a subnet checking to see if the IP address it wants to reach is in the same network or not; to be able to decide to forward the packet to its gateway or not.
when you have a subnet mask of /24 which refers in binary to 11111111.11111111.11111111.00000000. Zeros are the places you can modify your IP address in the "same network". If you change anything before zeros start, it means you are changing the network you are in and to be able to communicate with such an IP you need a router between two of them. After all, being able to make this decision is considered as making a routing decision.
Hope the answer helps.
answered 11 hours ago
metinmetin
664
New contributor
metin 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 |
Theoretically, consider a computer that has an IP address of 192.168.1.3/24 and wants to send some data to the IP address 192.168.2.5/24 then it should make a subnet checking to see if the IP address it wants to reach is in the same network or not; to be able to decide to forward the packet to its gateway or not.
when you have a subnet mask of /24 which refers in binary to 11111111.11111111.11111111.00000000. Zeros are the places you can modify your IP address in the "same network". If you change anything before zeros start, it means you are changing the network you are in and to be able to communicate with such an IP you need a router between two of them. After all, being able to make this decision is considered as making a routing decision.
Hope the answer helps.
answered 11 hours ago
metinmetin
664
New contributor
metin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Theoretically, consider a computer that has an IP address of 192.168.1.3/24 and wants to send some data to the IP address 192.168.2.5/24 then it should make a subnet checking to see if the IP address it wants to reach is in the same network or not; to be able to decide to forward the packet to its gateway or not.
when you have a subnet mask of /24 which refers in binary to 11111111.11111111.11111111.00000000. Zeros are the places you can modify your IP address in the "same network". If you change anything before zeros start, it means you are changing the network you are in and to be able to communicate with such an IP you need a router between two of them. After all, being able to make this decision is considered as making a routing decision.
Hope the answer helps.
answered 11 hours ago
metinmetin
664
New contributor
metin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 11 hours ago
metinmetin
664
New contributor
metin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 11 hours ago
metinmetin
664
answered 11 hours ago
metinmetin
664
664
New contributor
metin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
metin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
metin 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 |
add a comment |
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