diff options
| -rw-r--r-- | net/ipv4/Kconfig | 35 |
1 files changed, 13 insertions, 22 deletions
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig index 5b919f7b45db..70491d9035eb 100644 --- a/net/ipv4/Kconfig +++ b/net/ipv4/Kconfig @@ -273,29 +273,20 @@ config IP_PIMSM_V2 you want to play with it. config ARPD - bool "IP: ARP daemon support (EXPERIMENTAL)" - depends on EXPERIMENTAL + bool "IP: ARP daemon support" ---help--- - 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. + 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. 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. config SYN_COOKIES bool "IP: TCP syncookie support (disabled per default)" |