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Old 12th December 2017
Lexus45 Lexus45 is offline
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Hello all.

I'm reading the documentation about CARP and can not understand why the theory and the examples differ.

Here is written about the shared virtual IP addres:
Quote:
... This address does not have to be in the same subnet as the IP address on the physical interface (if present)...
But here in the examples we see that carp devices have the IP addresses from the same subnets as corresponding physical devices.
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Old 12th December 2017
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jggimi jggimi is online now
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Each individual NIC in the group can have two addresses: the shared address of the devices in the group, assigned to the carpN device, plus an individual address for the backing device.

In my carp(4) deployments, I've only ever used addresses in the same subnet, primarily to avoid confusing myself. But as stated, this is not a necessity. Their unique "home" addresses do not need to be in the same subnet as their shared address. And they do not even require a unique address on their NICs. For example, they do not need unique addresses if they can be reached individually via a different NIC.

-----

Edited to add:

Having a carpN device and a backing NIC on the same subnet is one of the few cases where two NICs can share the same subnet.

Yes, both the carpN device and the backing device can also have their own IPv4 alias addresses, and each can have its own flight of IPv6 addresses.

Last edited by jggimi; 12th December 2017 at 02:54 PM.
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Old 13th December 2017
Lexus45 Lexus45 is offline
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As usual, thank you for the comprehensive answer.
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