IPCONFIG(8) System Manager's Manual IPCONFIG(8)NAME
ipconfig, arpd, rip - Internet configuration and routing
SYNOPSIS
ip/ipconfig [-abp] [-e etherdev] [-m ip-mask] [ipaddr]
ip/arpd [-pd] [-e etherdev] [-b bcast-addr]
ip/rip [-b]
DESCRIPTION
Ipconfig configures an Internet connection on an Ethernet. The options are
a do not start arpd
b do not use BOOTP to discover a gateway address
p start arpd in promiscuous mode (see below)
e use the Ethernet mounted at /net/etherdev
m set the network mask to ip-mask
If ipaddr is specified on the command line, use that instead of one found in the local database or via the BOOTP protocol.
Arpd performs the Internet Address Resolution Protocol, translating Internet addresses into Ethernet addresses. It is normally started by
ipconfig. The options are
d print debugging to standard output
p (promiscuous) answer ARP requests for any recognized machine. The default is to answer just for the machine running arpd.
e use the Ethernet mounted at /net/etherdev
b use the IP broadcast address bcast-addr instead of the correct one.
Rip runs the routing protocol RIP. It listens for RIP packets on connected networks and updates the kernel routing tables. The only
option, -b, broadcasts routing information onto the networks.
SOURCE
/sys/src/cmd/ip/ipconfig.c
/sys/src/cmd/ip/arpd.c
/sys/src/cmd/ip/rip.c
SEE ALSO ndb(6)IPCONFIG(8)
Check Out this Related Man Page
ARPD(8) System Manager's Manual ARPD(8)NAME
arpd - userspace arp daemon.
SYNOPSIS
Usage: arpd [ -lk ] [ -a N ] [ -b dbase ] [ -f file ] [ interfaces ]
DESCRIPTION
The arpd daemon collects gratuitous ARP information, saving it on local disk and feeding it to kernel on demand to avoid redundant broad-
casting due to limited size of kernel ARP cache.
OPTIONS -h -? Print help
-l Dump arpd database to stdout and exit. Output consists of three columns: interface index, IP address and MAC address. Negative
entries for dead hosts are also shown, in this case MAC address is replaced by word FAILED followed by colon and time when the fact
that host is dead was proven the last time.
-f <FILE>
Read and load arpd database from FILE in text format similar dumped by option -l. Exit after load, probably listing resulting data-
base, if option -l is also given. If FILE is -, stdin is read to get ARP table.
-b <DATABASE>
location of database file. Default location is /var/lib/arpd/arpd.db
-a <NUMBER>
arpd not only passively listens ARP on wire, but also send brodcast queries itself. NUMBER is number of such queries to make before
destination is considered as dead. When arpd is started as kernel helper (i.e. with app_solicit enabled in sysctl or even with
option -k) without this option and still did not learn enough information, you can observe 1 second gaps in service. Not fatal, but
not good.
-k Suppress sending broadcast queries by kernel. It takes sense together with option -a.
-n <TIME>
Timeout of negative cache. When resolution fails arpd suppresses further attempts to resolve for this period. It makes sense only
together with option -k This timeout should not be too much longer than boot time of a typical host not supporting gratuitous ARP.
Default value is 60 seconds.
-r <RATE>
Maximal steady rate of broadcasts sent by arpd in packets per second. Default value is 1.
-B <NUMBER>
Number of broadcasts sent by <tt/arpd/ back to back. Default value is 3. Together with option <tt/-R/ this option allows to police
broadcasting not to exceed B+R*T over any interval of time T.
<INTERFACE> is the name of networking interface to watch. If no interfaces given, arpd monitors all the interfaces. In this case arpd does
not adjust sysctl parameters, it is supposed user does this himself after arpd is started.
Signals
arpd exits gracefully syncing database and restoring adjusted sysctl parameters, when receives SIGINT or SIGTERM. SIGHUP syncs database to
disk. SIGUSR1 sends some statistics to syslog. Effect of another signals is undefined, they may corrupt database and leave sysctl praame-
ters in an unpredictable state.
Note
In order for arpd to be able to serve as ARP resolver, kernel must be compiled with the option CONFIG_ARPD and, in the case when interface
list in not given on command line, variable app_solicit on interfaces of interest should be in /proc/sys/net/ipv4/neigh/*. If this is not
made arpd still collects gratuitous ARP information in its database.
EXAMPLES
arpd -b /var/tmp/arpd.db
Start arpd to collect gratuitous ARP, but not messing with kernel functionality.
killall arpd ; arpd -l -b /var/tmp/arpd.db
Look at result after some time.
arpd -b /var/tmp/arpd.db -a 1 eth0 eth1
Enable kernel helper, leaving leading role to kernel.
arpd -b /var/tmp/arpd.db -a 3 -k eth0 eth1
Completely replace kernel resolution on interfaces eth0 and eth1. In this case kernel still does unicast probing to validate
entries, but all the broadcast activity is suppressed and made under authority of arpd.
This is mode which arpd is supposed to work normally. It is not default just to prevent occasional enabling of too aggressive mode occa-
sionally.
28 June, 2007 ARPD(8)