Sponsored Content
Full Discussion: Modifying ARP frames
Special Forums IP Networking Modifying ARP frames Post 302255429 by lagigliaivan on Thursday 6th of November 2008 11:24:18 AM
Old 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???
 

7 More Discussions You Might Find Interesting

1. IP Networking

Frames problems

I'm using ethereal to analyse my network from my pc. There're too many TCP Bad checksum 1. between my PC and unix servers (checksum: 0x6660 ) 2. between my PC and other servers (windows, novell) checksum: 0x6644 ) There're too many NBNS and BOOTP/DHCP Malformed Packet(Exception occured) ... (0 Replies)
Discussion started by: nymus7
0 Replies

2. Web Development

Compatibility with different browsers for frames

Hi, I am writing a web application using Perl CGI. And I have defined an frame within like this "<iframe id=\"iframe01\" name=\"iframe01\" height=480 width=800 frameborder=0 scrolling=no></iframe>" My problem is that this iframe appears differently on different browsers - IE6, IE7, Mozilla... (0 Replies)
Discussion started by: garric
0 Replies

3. Linux

Ether header for tagged frames

Hi, Need Help! I'm porting VxWorks code to Linux. Here in VxWorks I have a structure called ether_tag_header. What is the equivalent structure in Linux? Note: struct ether_tag_header { u_char ether_dhost; u_char ether_shost; u_char etherTag; u_short... (0 Replies)
Discussion started by: ytrew
0 Replies

4. IP Networking

Interpreting [|llc] frames in enterprise traffic trace

The LBNL/ICSI Enterprise Tracing Project at LBNL/ICSI Enterprise Tracing Project - Project Overview provides a trace of an enterprise's network from 2005. Upon reading these files with tcpdump, along with regular packets that appear like- 12:04:51.696971 IP 128.3.189.248.netbios-ssn >... (0 Replies)
Discussion started by: sstatla
0 Replies

5. Shell Programming and Scripting

How to put html frames in for loop in perl?

Hi, I have to insert html frames in for loop. Here is the code. for($k=0;$k<3;$k++) { print<<HTML; <html> <head> <title> HTML Horizontal Frames </title> </head> <frameset cols="25%,75%"> <frame src="a.html"> <frame src="b.html"> </frameset> (0 Replies)
Discussion started by: vanitham
0 Replies

6. IP Networking

necessary ARP request?

Hello, I have 2 clients with Unix installed. host1: eth0 (192.168.5.10) & eth1 (192.168.10.10) host2: eth0 (192.168.10.20) I've connected host1-eth1 to host2-eth0. host1-eth0 isn't connected. I started 'tcpdump' on wonder that host2 got ARP requests for 192.168.5.10. Any idea why host1... (2 Replies)
Discussion started by: daWonderer
2 Replies

7. AIX

HMC Hardware Discovery does not work for p595 frames

Hi, I require help with hardware discovery while running a command from an HMC with firmware V7.3.5 SP 3. The two frames I am running the command for are p 5 595's. Command input: lshwres -m swdc-c02-9119-595-SN02780CF -r io --rsubtype slotchildren -F lpar_name Error output: The managed... (1 Reply)
Discussion started by: AIXNEWBIE62
1 Replies
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)
All times are GMT -4. The time now is 11:28 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy