[SunHELP] arp command

[DAUBIGNE Sebastien - BOR]

The "number" you requested is the MAC (ethernet, ...) address of the =
host.

To send packets to hosts directly attached to your LAN via IP, the =
kernel
has to maitain  an IP-to-Ethernet lookup table.
This job is done automatically by the kernel every time he sends =
packets to
a local host which is not already in the ARP table.

Every ARP table entry is cleared after a certain amount of time (TTL), =
so
that the entry could be refreshed if the corresponding host's IP =
address
changes.

So you don't usually have to issue "arp -d", even "arp -s", at least =
for
Ethernet because the kernel does it.=20

If  you want to add back the entry you deleted, just send packets to =
the
host.

e.g. :   =20

# ping  hostname
# arp -l=20


---
Sebastien DAUBIGNE=20
sebastien.daubigne at sema.fr - 05.57.26.56.36
Sema Global Services - AFM/DW/Pessac


	-----Message d'origine-----
	De:	Wally A. Alubankudi [SMTP:walubank at hotmail.com]
	Date:	lundi 9 juillet 2001 18:51
	=C0:	sunhelp at sunhelp.org
	Objet:	[SunHELP] arp command

	Hi All,
	      I was just fiddling with arp command and I run #arp -d
hostname and I=20
	got a result that it has been deleted. I decided to add it back by
running=20
	#arp -s hostname but arp command want be to add some numbers which i
dont=20
	know where to get it. Please help.
	Wally
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