Network dynamic failover does not work if IP address differs between ethernet and wifiHowto migrate from networking to systemd-networkd with dynamic failoverAccess point as WiFi router/repeater, optional with bridgeFacing issue in ethernet configuration for RaspbianRouting traffic with 2 VPN Gateways on RaspberryPisystemd-networkd: Bond Ethernet and Wifi (USB Dongle), AP with Raspi 3b+ on board Wifi
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Network dynamic failover does not work if IP address differs between ethernet and wifi
Howto migrate from networking to systemd-networkd with dynamic failoverAccess point as WiFi router/repeater, optional with bridgeFacing issue in ethernet configuration for RaspbianRouting traffic with 2 VPN Gateways on RaspberryPisystemd-networkd: Bond Ethernet and Wifi (USB Dongle), AP with Raspi 3b+ on board Wifi
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after reading this answer for how to setup dynamic network failover I am having a question.
First of all thanks a lot to @Ingo posting this manual how to setup bonding/dynamic network failover. It was very easy to setup and works fine for me if my ethernet and wlan network IP address are the same!
However, if my wifi connection is a phone/cellular hotspot that uses a different internet IP address (for example 172.20.10.2 instead of 192.168.2.105 on the ethernet connection), the failover is not working! It looks to me like the bonding interface sticks with the old 192.168.2.105 IP address and then the new connection on the wifi does not work. Do you have any idea what could be the reason?
I have tried to setup the ethernet and wifi interface with static ips, however that didn't help. The bonding interface (still on DHCP) sticks with the IP address from the ethernet interface, even though that one is down.
Any help is appreciated!!
systemd-networkd
asked 8 hours ago
Peter H.Peter H.
112 bronze badges
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Peter H. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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add a comment
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after reading this answer for how to setup dynamic network failover I am having a question.
First of all thanks a lot to @Ingo posting this manual how to setup bonding/dynamic network failover. It was very easy to setup and works fine for me if my ethernet and wlan network IP address are the same!
However, if my wifi connection is a phone/cellular hotspot that uses a different internet IP address (for example 172.20.10.2 instead of 192.168.2.105 on the ethernet connection), the failover is not working! It looks to me like the bonding interface sticks with the old 192.168.2.105 IP address and then the new connection on the wifi does not work. Do you have any idea what could be the reason?
I have tried to setup the ethernet and wifi interface with static ips, however that didn't help. The bonding interface (still on DHCP) sticks with the IP address from the ethernet interface, even though that one is down.
Any help is appreciated!!
systemd-networkd
asked 8 hours ago
Peter H.Peter H.
112 bronze badges
New contributor
Peter H. 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
|
after reading this answer for how to setup dynamic network failover I am having a question.
First of all thanks a lot to @Ingo posting this manual how to setup bonding/dynamic network failover. It was very easy to setup and works fine for me if my ethernet and wlan network IP address are the same!
However, if my wifi connection is a phone/cellular hotspot that uses a different internet IP address (for example 172.20.10.2 instead of 192.168.2.105 on the ethernet connection), the failover is not working! It looks to me like the bonding interface sticks with the old 192.168.2.105 IP address and then the new connection on the wifi does not work. Do you have any idea what could be the reason?
I have tried to setup the ethernet and wifi interface with static ips, however that didn't help. The bonding interface (still on DHCP) sticks with the IP address from the ethernet interface, even though that one is down.
Any help is appreciated!!
systemd-networkd
asked 8 hours ago
Peter H.Peter H.
112 bronze badges
New contributor
Peter H. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
after reading this answer for how to setup dynamic network failover I am having a question.
First of all thanks a lot to @Ingo posting this manual how to setup bonding/dynamic network failover. It was very easy to setup and works fine for me if my ethernet and wlan network IP address are the same!
However, if my wifi connection is a phone/cellular hotspot that uses a different internet IP address (for example 172.20.10.2 instead of 192.168.2.105 on the ethernet connection), the failover is not working! It looks to me like the bonding interface sticks with the old 192.168.2.105 IP address and then the new connection on the wifi does not work. Do you have any idea what could be the reason?
I have tried to setup the ethernet and wifi interface with static ips, however that didn't help. The bonding interface (still on DHCP) sticks with the IP address from the ethernet interface, even though that one is down.
Any help is appreciated!!
systemd-networkd
systemd-networkd
asked 8 hours ago
Peter H.Peter H.
112 bronze badges
New contributor
Peter H. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 8 hours ago
Peter H.Peter H.
112 bronze badges
New contributor
Peter H. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 8 hours ago
Peter H.Peter H.
112 bronze badges
New contributor
Peter H. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 8 hours ago
Peter H.Peter H.
112 bronze badges
asked 8 hours ago
Peter H.Peter H.
112 bronze badges
112 bronze badges
New contributor
Peter H. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Peter H. 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
|
2 Answers
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The simple answer is that you can't use that as a failover for existing connections.
If you have short connections or can reconnect after a failure, the next connection will use the other interface. But an existing connection is always tied to a specific IP address pair.
Even if you could convince the kernel to move the connection to the other local address, it wouldn't work because the other end doesn't expect packets for the connection to suddenly come from a different IP address.
IPv6 has some support for failover, and you can do something similar with IPv4, but both sides must support it, so you can't use that for standard connections.
If you really want a failover for existing connections, you can set up two links to a server configured to allow that. All connections to the outside will seem to come from this server.
answered 6 hours ago
RalfFriedlRalfFriedl
1,7892 gold badges5 silver badges10 bronze badges
I am glad to hear that IPv6 support more things. I don't know what is going on the discussion here, but I think when IPv6 and 5G arrive, all network problems wiil disappear, just like glass fiber wire replacing copper wire, and 1/23/4/5G mobile phones replace land line phones and the stupid "0.5G pagers.
– tlfong01
5 hours ago
add a comment
|
The goal of bonding is that the ip address on an interface does not change no matter what connection is used. The interface is connected to a subnet with a defined ip address range. It can only direct connect to devices on the same subnet. If it want to connect to devices on other subnets there is a router needed that sends packets from one subnet to the next.
Your internet router uses subnet 192.168.2.0/24 and the DHCP server on this subnet gives ip address 192.168.2.105 to the RasPi. The cell phone uses subnet 172.16.0.0/12 and the DHCP server on this subnet gives ip address 172.20.10.2 to the RasPi. With DHCP enabled on the RasPi you will get different ip addresses on the bond0 interface. That breaks bonding by definition.
First of all you have to determine what subnet to use, maybe that private subnet from the cell phone 172.16.0.0/12. Then you can give bond0 a static ip address, e.g. 172.20.10.200/12. Now you have to configure the internet router for the wired connection to use the same subnet so all devices are on this subnet.
But as you see, a cell phone is a device for personal use and not very suitable to improve stability of a network.
answered 5 hours ago
IngoIngo
15.1k5 gold badges20 silver badges75 bronze badges
add a comment
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
The simple answer is that you can't use that as a failover for existing connections.
If you have short connections or can reconnect after a failure, the next connection will use the other interface. But an existing connection is always tied to a specific IP address pair.
Even if you could convince the kernel to move the connection to the other local address, it wouldn't work because the other end doesn't expect packets for the connection to suddenly come from a different IP address.
IPv6 has some support for failover, and you can do something similar with IPv4, but both sides must support it, so you can't use that for standard connections.
If you really want a failover for existing connections, you can set up two links to a server configured to allow that. All connections to the outside will seem to come from this server.
answered 6 hours ago
RalfFriedlRalfFriedl
1,7892 gold badges5 silver badges10 bronze badges
I am glad to hear that IPv6 support more things. I don't know what is going on the discussion here, but I think when IPv6 and 5G arrive, all network problems wiil disappear, just like glass fiber wire replacing copper wire, and 1/23/4/5G mobile phones replace land line phones and the stupid "0.5G pagers.
– tlfong01
5 hours ago
add a comment
|
The simple answer is that you can't use that as a failover for existing connections.
If you have short connections or can reconnect after a failure, the next connection will use the other interface. But an existing connection is always tied to a specific IP address pair.
Even if you could convince the kernel to move the connection to the other local address, it wouldn't work because the other end doesn't expect packets for the connection to suddenly come from a different IP address.
IPv6 has some support for failover, and you can do something similar with IPv4, but both sides must support it, so you can't use that for standard connections.
If you really want a failover for existing connections, you can set up two links to a server configured to allow that. All connections to the outside will seem to come from this server.
answered 6 hours ago
RalfFriedlRalfFriedl
1,7892 gold badges5 silver badges10 bronze badges
I am glad to hear that IPv6 support more things. I don't know what is going on the discussion here, but I think when IPv6 and 5G arrive, all network problems wiil disappear, just like glass fiber wire replacing copper wire, and 1/23/4/5G mobile phones replace land line phones and the stupid "0.5G pagers.
– tlfong01
5 hours ago
add a comment
|
The simple answer is that you can't use that as a failover for existing connections.
If you have short connections or can reconnect after a failure, the next connection will use the other interface. But an existing connection is always tied to a specific IP address pair.
Even if you could convince the kernel to move the connection to the other local address, it wouldn't work because the other end doesn't expect packets for the connection to suddenly come from a different IP address.
IPv6 has some support for failover, and you can do something similar with IPv4, but both sides must support it, so you can't use that for standard connections.
If you really want a failover for existing connections, you can set up two links to a server configured to allow that. All connections to the outside will seem to come from this server.
answered 6 hours ago
RalfFriedlRalfFriedl
1,7892 gold badges5 silver badges10 bronze badges
The simple answer is that you can't use that as a failover for existing connections.
If you have short connections or can reconnect after a failure, the next connection will use the other interface. But an existing connection is always tied to a specific IP address pair.
Even if you could convince the kernel to move the connection to the other local address, it wouldn't work because the other end doesn't expect packets for the connection to suddenly come from a different IP address.
IPv6 has some support for failover, and you can do something similar with IPv4, but both sides must support it, so you can't use that for standard connections.
If you really want a failover for existing connections, you can set up two links to a server configured to allow that. All connections to the outside will seem to come from this server.
answered 6 hours ago
RalfFriedlRalfFriedl
1,7892 gold badges5 silver badges10 bronze badges
answered 6 hours ago
RalfFriedlRalfFriedl
1,7892 gold badges5 silver badges10 bronze badges
answered 6 hours ago
RalfFriedlRalfFriedl
1,7892 gold badges5 silver badges10 bronze badges
answered 6 hours ago
RalfFriedlRalfFriedl
1,7892 gold badges5 silver badges10 bronze badges
1,7892 gold badges5 silver badges10 bronze badges
I am glad to hear that IPv6 support more things. I don't know what is going on the discussion here, but I think when IPv6 and 5G arrive, all network problems wiil disappear, just like glass fiber wire replacing copper wire, and 1/23/4/5G mobile phones replace land line phones and the stupid "0.5G pagers.
– tlfong01
5 hours ago
add a comment
|
I am glad to hear that IPv6 support more things. I don't know what is going on the discussion here, but I think when IPv6 and 5G arrive, all network problems wiil disappear, just like glass fiber wire replacing copper wire, and 1/23/4/5G mobile phones replace land line phones and the stupid "0.5G pagers.
– tlfong01
5 hours ago
I am glad to hear that IPv6 support more things. I don't know what is going on the discussion here, but I think when IPv6 and 5G arrive, all network problems wiil disappear, just like glass fiber wire replacing copper wire, and 1/23/4/5G mobile phones replace land line phones and the stupid "0.5G pagers.
– tlfong01
5 hours ago
I am glad to hear that IPv6 support more things. I don't know what is going on the discussion here, but I think when IPv6 and 5G arrive, all network problems wiil disappear, just like glass fiber wire replacing copper wire, and 1/23/4/5G mobile phones replace land line phones and the stupid "0.5G pagers.
– tlfong01
5 hours ago
add a comment
|
The goal of bonding is that the ip address on an interface does not change no matter what connection is used. The interface is connected to a subnet with a defined ip address range. It can only direct connect to devices on the same subnet. If it want to connect to devices on other subnets there is a router needed that sends packets from one subnet to the next.
Your internet router uses subnet 192.168.2.0/24 and the DHCP server on this subnet gives ip address 192.168.2.105 to the RasPi. The cell phone uses subnet 172.16.0.0/12 and the DHCP server on this subnet gives ip address 172.20.10.2 to the RasPi. With DHCP enabled on the RasPi you will get different ip addresses on the bond0 interface. That breaks bonding by definition.
First of all you have to determine what subnet to use, maybe that private subnet from the cell phone 172.16.0.0/12. Then you can give bond0 a static ip address, e.g. 172.20.10.200/12. Now you have to configure the internet router for the wired connection to use the same subnet so all devices are on this subnet.
But as you see, a cell phone is a device for personal use and not very suitable to improve stability of a network.
answered 5 hours ago
IngoIngo
15.1k5 gold badges20 silver badges75 bronze badges
add a comment
|
The goal of bonding is that the ip address on an interface does not change no matter what connection is used. The interface is connected to a subnet with a defined ip address range. It can only direct connect to devices on the same subnet. If it want to connect to devices on other subnets there is a router needed that sends packets from one subnet to the next.
Your internet router uses subnet 192.168.2.0/24 and the DHCP server on this subnet gives ip address 192.168.2.105 to the RasPi. The cell phone uses subnet 172.16.0.0/12 and the DHCP server on this subnet gives ip address 172.20.10.2 to the RasPi. With DHCP enabled on the RasPi you will get different ip addresses on the bond0 interface. That breaks bonding by definition.
First of all you have to determine what subnet to use, maybe that private subnet from the cell phone 172.16.0.0/12. Then you can give bond0 a static ip address, e.g. 172.20.10.200/12. Now you have to configure the internet router for the wired connection to use the same subnet so all devices are on this subnet.
But as you see, a cell phone is a device for personal use and not very suitable to improve stability of a network.
answered 5 hours ago
IngoIngo
15.1k5 gold badges20 silver badges75 bronze badges
add a comment
|
The goal of bonding is that the ip address on an interface does not change no matter what connection is used. The interface is connected to a subnet with a defined ip address range. It can only direct connect to devices on the same subnet. If it want to connect to devices on other subnets there is a router needed that sends packets from one subnet to the next.
Your internet router uses subnet 192.168.2.0/24 and the DHCP server on this subnet gives ip address 192.168.2.105 to the RasPi. The cell phone uses subnet 172.16.0.0/12 and the DHCP server on this subnet gives ip address 172.20.10.2 to the RasPi. With DHCP enabled on the RasPi you will get different ip addresses on the bond0 interface. That breaks bonding by definition.
First of all you have to determine what subnet to use, maybe that private subnet from the cell phone 172.16.0.0/12. Then you can give bond0 a static ip address, e.g. 172.20.10.200/12. Now you have to configure the internet router for the wired connection to use the same subnet so all devices are on this subnet.
But as you see, a cell phone is a device for personal use and not very suitable to improve stability of a network.
answered 5 hours ago
IngoIngo
15.1k5 gold badges20 silver badges75 bronze badges
The goal of bonding is that the ip address on an interface does not change no matter what connection is used. The interface is connected to a subnet with a defined ip address range. It can only direct connect to devices on the same subnet. If it want to connect to devices on other subnets there is a router needed that sends packets from one subnet to the next.
Your internet router uses subnet 192.168.2.0/24 and the DHCP server on this subnet gives ip address 192.168.2.105 to the RasPi. The cell phone uses subnet 172.16.0.0/12 and the DHCP server on this subnet gives ip address 172.20.10.2 to the RasPi. With DHCP enabled on the RasPi you will get different ip addresses on the bond0 interface. That breaks bonding by definition.
First of all you have to determine what subnet to use, maybe that private subnet from the cell phone 172.16.0.0/12. Then you can give bond0 a static ip address, e.g. 172.20.10.200/12. Now you have to configure the internet router for the wired connection to use the same subnet so all devices are on this subnet.
But as you see, a cell phone is a device for personal use and not very suitable to improve stability of a network.
answered 5 hours ago
IngoIngo
15.1k5 gold badges20 silver badges75 bronze badges
answered 5 hours ago
IngoIngo
15.1k5 gold badges20 silver badges75 bronze badges
answered 5 hours ago
IngoIngo
15.1k5 gold badges20 silver badges75 bronze badges
answered 5 hours ago
IngoIngo
15.1k5 gold badges20 silver badges75 bronze badges
15.1k5 gold badges20 silver badges75 bronze badges
add a comment
|
add a comment
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Peter H. is a new contributor. Be nice, and check out our Code of Conduct.
Peter H. is a new contributor. Be nice, and check out our Code of Conduct.
Peter H. is a new contributor. Be nice, and check out our Code of Conduct.
Peter H. is a new contributor. Be nice, and check out our Code of Conduct.
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