diff options
Diffstat (limited to 'usr.sbin/arp')
| -rw-r--r-- | usr.sbin/arp/arp.4 | 56 |
1 files changed, 50 insertions, 6 deletions
diff --git a/usr.sbin/arp/arp.4 b/usr.sbin/arp/arp.4 index d537350..0ff0f2c 100644 --- a/usr.sbin/arp/arp.4 +++ b/usr.sbin/arp/arp.4 @@ -28,7 +28,7 @@ .\" @(#)arp4.4 6.5 (Berkeley) 4/18/94 .\" $FreeBSD$ .\" -.Dd March 28, 2007 +.Dd September 3, 2012 .Dt ARP 4 .Os .Sh NAME @@ -113,26 +113,65 @@ MIB variable .Va net.link.ether.inet.proxyall to 1. .Sh MIB Variables -The ARP protocol implements a number of configrable variables in +The ARP protocol implements a number of configurable variables in .Va net.link.ether.inet branch of the .Xr sysctl 3 MIB. -.Bl -tag +.Bl -tag -width "log_arp_permanent_modify" +.It Va allow_multicast +Should the kernel install ARP entries with multicast bit set in +the hardware address. +Installing such entries is RFC 1812 violation, but some prorietary +load balancing techniques require routers on network to do so. +Turned off by default. +.It Va log_arp_movements +Should the kernel log movements of IP addresses from one hardware +address to an other. +See +.Sx DIAGNOSTICS +below. +Turned on by default. +.It Va log_arp_permanent_modify +Should the kernel log attempts of remote host on network to modify a +permanent ARP entry. +See +.Sx DIAGNOSTICS +below. +Turned on by default. +.It Va log_arp_wrong_iface +Should the kernel log attempts to insert an ARP entry on an interface +when the IP network the address belongs to is connected to an other +interface. +See +.Sx DIAGNOSTICS +below. +Turned on by default. .It Va max_age How long an ARP entry is held in the cache until it needs to be refreshed. +Default is 1200 seconds. +.It Va maxhold +How many packets hold in the per-entry output queue while the entry +is being resolved. +Default is one packet. .It Va maxtries Number of retransmits before host is considered down and error is returned. +Default is 5 tries. +.It Va proxyall +Enables ARP proxying for all hosts on net. +Turned off by default. .It Va useloopback If an ARP entry is added for local address, force the traffic to go through the loopback interface. -.It Va proxyall -Enables ARP proxying for all hosts on net. +Turned on by default. +.It Va wait +Lifetime of an incomplete ARP entry. +Default is 20 seconds. .El .Sh DIAGNOSTICS .Bl -diag -.It "arp: %x:%x:%x:%x:%x:%x is using my IP address %d.%d.%d.%d!" +.It "arp: %x:%x:%x:%x:%x:%x is using my IP address %d.%d.%d.%d on %s!" ARP has discovered another host on the local network which responds to mapping requests for its own Internet address with a different Ethernet address, generally indicating that two hosts are attempting to use the @@ -170,6 +209,11 @@ entry in the local ARP table. This error will only be logged if the sysctl .Va net.link.ether.inet.log_arp_permanent_modify is set to 1, which is the system's default behaviour. +.It "arp: %x:%x:%x:%x:%x:%x is multicast" +Kernel refused to install an entry with multicast hardware address. +If you really want such addresses being installed, set the sysctl +.Va net.link.ether.inet.allow_multicast +to a positive value. .El .Sh SEE ALSO .Xr inet 4 , |
