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authorTimo Teräs <timo.teras@iki.fi>2009-06-11 19:38:02 +0000
committerDavid S. Miller <davem@davemloft.net>2009-06-13 23:36:32 -0700
commite61a4b634a15c11725eac8e66b457ba411168c7f (patch)
treedd9a1110b4c434d4e767b7fb23d4ccb106783575 /net
parent125bb8f5637bd653244728f734bcac218986d910 (diff)
downloadlinux-2.6.34-ux500-e61a4b634a15c11725eac8e66b457ba411168c7f.tar.gz
ipv4: update ARPD help text
Removed the statements about ARP cache size as this config option does not affect it. The cache size is controlled by neigh_table gc thresholds. Remove also expiremental and obsolete markings as the API originally intended for arp caching is useful for implementing ARP-like protocols (e.g. NHRP) in user space and has been there for a long enough time. Signed-off-by: Timo Teras <timo.teras@iki.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/Kconfig35
1 files changed, 13 insertions, 22 deletions
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 5b919f7b45d..70491d9035e 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)"