11-06-2008
Thanks!
Thanks for your reply sysgate.
I have to deal with arp frames because I have a wired LAN configuration. I have a few devices that has the same IP address and it is impossible to be changed. All of them has different MAC address and they take its firmware from a tftp server.
The problem to be solved is the following:
While all the devices are connected to the same switch, and all of them have the same IP address, it has to be possible to upgrade every one (one by one) downloading its firmware from the ftp server.
I was thinking on blocking the tftp arp request to these devices and in some way (e.g. running a script, iptables, etc) when a device tries to connect to the tftp server, the last one automatically adds a fix rule in the arp cache so it does not send an arp request to devices an only response to only one.
Could you pleas help me???
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ARP(8C) ARP(8C)
NAME
arp - address resolution display and control
SYNOPSIS
arp hostname
arp -a [ vmunix ] [ kmem ]
arp -d hostname
arp -s hostname ether_addr [ temp ] [ pub ] [ trail ]
arp -f filename
DESCRIPTION
The arp program displays and modifies the Internet-to-Ethernet address translation tables used by the address resolution protocol
(arp(4p)).
With no flags, the program displays the current ARP entry for hostname. The host may be specified by name or by number, using Internet dot
notation. With the -a flag, the program displays all of the current ARP entries by reading the table from the file kmem (default
/dev/kmem) based on the kernel file vmunix (default /vmunix).
With the -d flag, a super-user may delete an entry for the host called hostname.
The -s flag is given to create an ARP entry for the host called hostname with the Ethernet address ether_addr. The Ethernet address is
given as six hex bytes separated by colons. The entry will be permanent unless the word temp is given in the command. If the word pub is
given, the entry will be "published"; i.e., this system will act as an ARP server, responding to requests for hostname even though the host
address is not its own. The word trail indicates that trailer encapsulations may be sent to this host.
The -f flag causes the file filename to be read and multiple entries to be set in the ARP tables. Entries in the file should be of the
form
hostname ether_addr [ temp ] [ pub ] [ trail ]
with argument meanings as given above.
SEE ALSO
inet(3N), arp(4P), ifconfig(8C)
4.3 Berkeley Distribution May 20, 1986 ARP(8C)