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CONFIG_ARPD: IP: ARP daemon support (EXPERIMENTAL)

General informations

The Linux kernel configuration item CONFIG_ARPD has multiple definitions:

IP: ARP daemon support (EXPERIMENTAL) found in net/ipv4/Kconfig

The configuration item CONFIG_ARPD:

Help text

Normally, the kernel maintains an internal cache which maps IP addresses to hardware addresses on the local network, so that Ethernet/Token Ring/ etc. frames are sent to the proper address on the physical networking layer. For small networks having a few hundred directly connected hosts or less, keeping this address resolution (ARP) cache inside the kernel works well. However, maintaining an internal ARP cache does not work well for very large switched networks, and will use a lot of kernel memory if TCP/IP connections are made to many machines on the network.

If you say Y here, the kernel's internal ARP cache will never grow to more than 256 entries (the oldest entries are expired in a LIFO manner) and communication will be attempted with the user space ARP daemon arpd. Arpd then answers the address resolution request either from its own cache or by asking the net.

This code is experimental and also obsolete. If you want to use it, you need to find a version of the daemon arpd on the net somewhere, and you should also say Y to "Kernel/User network link driver", below. If unsure, say N.

IP: ARP daemon support found in net/ipv4/Kconfig

The configuration item CONFIG_ARPD:

Help text

The kernel maintains an internal cache which maps IP addresses to hardware addresses on the local network, so that Ethernet frames are sent to the proper address on the physical networking layer. Normally, kernel uses the ARP protocol to resolve these mappings.

Saying Y here adds support to have an user space daemon to do this resolution instead. This is useful for implementing an alternate address resolution protocol (e.g. NHRP on mGRE tunnels) and also for testing purposes.

If unsure, say N.

Hardware

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