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arp.7: grfix

This commit is contained in:
Michael Kerrisk 2008-11-21 21:41:19 -05:00
parent fc59cb811b
commit caf5129c82
1 changed files with 9 additions and 9 deletions
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18
man7/arp.7
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@ -46,7 +46,7 @@ interfaces described below.
When there is no positive feedback for an existing mapping after some
time (see the
.I /proc
interfaces below) a neighbor cache entry is considered stale.
interfaces below), a neighbor cache entry is considered stale.
Positive feedback can be gotten from a higher layer; for example from
a successful TCP ACK.
Other protocols can signal forward progress
@ -54,14 +54,14 @@ using the
.B MSG_CONFIRM
flag to
.BR sendmsg (2).
When there is no forward progress ARP tries to reprobe.
When there is no forward progress, ARP tries to reprobe.
It first tries to ask a local arp daemon
.B app_solicit
times for an updated MAC address.
If that fails and an old MAC address is known an unicast probe is send
If that fails and an old MAC address is known, a unicast probe is sent
.B ucast_solicit
times.
If that fails too it will broadcast a new ARP
If that fails too, it will broadcast a new ARP
request to the network.
Requests are only send when there is data queued
for sending.
@ -69,7 +69,7 @@ for sending.
Linux will automatically add a non-permanent proxy arp entry when it
receives a request for an address it forwards to and proxy arp is
enabled on the receiving interface.
When there is a reject route for the target no proxy arp entry is added.
When there is a reject route for the target, no proxy arp entry is added.
.SS Ioctls
Three ioctls are available on all
.B AF_INET
@ -92,7 +92,7 @@ struct arpreq {
.BR SIOCSARP ", " SIOCDARP " and " SIOCGARP
respectively set, delete and get an ARP mapping.
Setting & deleting ARP maps are privileged operations and may
Setting and deleting ARP maps are privileged operations and may
only be performed by a process with the
.B CAP_NET_ADMIN
capability or an effective UID of 0.
@ -143,7 +143,7 @@ Each interface in the system has its own directory in
.IR /proc/sys/net/ipv4/neigh/ .
The setting in the "default" directory is used for all newly created
devices.
Unless otherwise specified time-related interfaces are specified
Unless otherwise specified, time-related interfaces are specified
in seconds.
.TP
.I anycast_delay
@ -178,7 +178,7 @@ Defaults to 30 seconds.
.TP
.I gc_stale_time
Determines how often to check for stale neighbor entries.
When a neighbor entry is considered stale it is resolved again before
When a neighbor entry is considered stale, it is resolved again before
sending data to it.
Defaults to 60 seconds.
.TP
@ -259,7 +259,7 @@ and kernel version-dependent; see
.BR time (7).
There is no way to signal positive feedback from user space.
This means connection oriented protocols implemented in user space
This means connection-oriented protocols implemented in user space
will generate excessive ARP traffic, because ndisc will regularly
reprobe the MAC address.
The same problem applies for some kernel protocols (e.g., NFS over UDP).