ARP address resoluton Post: 20828

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Special Forums Cybersecurity ARP address resoluton Post 20828 by Perderabo on Monday 6th of May 2002 07:56:27 AM

05-06-2002

Administrator Emeritus

ARP does not take care of address uniqueness. That's not arp's job. It assumes the addresses are unique and will fail if they are not.

Your second question does not compute for me. I would assume that you are running slip or ppp or something like that. If you really have a mutant ISP that is assigning you a MAC address, you need to determine which type of mac address it is. If it's a ethernet address, your ISP could apply for a block of ethernet addresses. The ethernet address has two parts: a manufacturer id and unique address within the manufacturer id. Other lans work the same way.

To support their switchover product, HP would give out ethernet addresses not assigned to any hardware. All of HP's addresses are unique to HP. And it's up to HP to make sure that they don't give out the same address twice.

Perderabo

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LEARN ABOUT MINIX

hostaddr

HOSTADDR(1)						      General Commands Manual						       HOSTADDR(1)

NAME

       hostaddr - show ethernet address, IP address or hostname

SYNOPSIS

       hostaddr [-eia] [-E eth-device] [-I ip-device]

DESCRIPTION

       Without	any  of  the -eia options, hostaddr shows the ethernet address, IP address and hostname of the local host on one line in the given
       order.  With options only the wanted fields are shown, still in the same order, not in option order.

OPTIONS

       -e     Show the ethernet address.

       -i     Show the IP address.  This will not work if no IP address has been found by RARP or by setting it with ifconfig(8).

       -a     Show the fully qualified hostname.  The IP address is shown again if it can't be translated to a host name.  (This usually indicates
	      that the DNS reverse address translation tables are incomplete.)

SEE ALSO

       ifconfig(8), rarpd(8), nonamed(8), set_net_default(8), boot(8).

DIAGNOSTICS

       "Timeout"
       Hostaddr  timed	out trying to get the IP address.  This means that the network connection is out of order or that the setup of the machine
       is bad.

AUTHOR

       Kees J. Bot (kjb@cs.vu.nl)

																       HOSTADDR(1)

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