ARP address resoluton

Thread Tools Search this Thread
Special Forums Cybersecurity ARP address resoluton
# 1  
Old 05-06-2002
Question ARP address resoluton

How does ARP take care of uniqueness of physical addresses?

How does an ISP allocate a MAC address when I do not have an NIC( Network interface Card)?
# 2  
Old 05-06-2002
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.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Red Hat

[RedHat] ARP issue

Hello, I am setting up a new RedHat server with two network interfaces. These interfaces are on different subnets, and connected to the same firewall. I'm trying to reach a remote IP. It works fine from the first interface. The second interface however, is making ARP requests instead of... (0 Replies)
Discussion started by: Wanou85
0 Replies

2. War Stories

What arp -s is good for

A customer appears to have drastically misunderstood our instructions for connecting to our WAN. He set his PC IP address to the same as one of the bridges. :mad: :wall: This caused much confusion on the network, to put it mildly. He called to complain about the poor performance of the network... (13 Replies)
Discussion started by: Corona688
13 Replies

3. IP Networking

necessary ARP request?

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

4. IP Networking

Protection against arp spoofing

Hi, I'm trying to find a way to protect my network against arp spoofing. What it is: An attacker sends fake arp packets in the network, identifying himself as the router. All network traffic is then redirected to this attacker. How to protect myself: In my opinion, the best possible... (2 Replies)
Discussion started by: chrisperry
2 Replies

5. UNIX for Advanced & Expert Users

arp questions

Can someone please explain this output to me. Why doesn't ifconfig show the same info? ~ $ arp -a ? ( at 00:1b:21:2b:eb:0c on eth0 (4 Replies)
Discussion started by: cokedude
4 Replies

6. Red Hat

Arp Problem

Dear All i have a linux proxy server which has RHEL-5 64 bit, it has two interfaces, it has the following details eth0= eth3= default gateway= one static route= gw i am facing a problem when i ping from... (2 Replies)
Discussion started by: surfer24
2 Replies

7. IP Networking

Modifying ARP frames

Hi All, Is there any way to modify or filter the ARP frames?? thanks! (2 Replies)
Discussion started by: lagigliaivan
2 Replies

8. HP-UX

HW Address and arp

I was checking nettl output for a unstable telnet to my server. this is part of output: ### ***********************************STREAMS/UX*******************************@#% Timestamp : Sun Jun 22 EETDST 2008 22:14:47.492899 Process ID : Subsystem ... (4 Replies)
Discussion started by: xramm
4 Replies

9. Solaris

ARP Cache

Dear all, We are testing two of our servers for mq series connectivity. The scenario is, when one machine is shutting down it's services there are some scripts that do a dns update, which removes the ip address and relates it to the ip address of the other node on our dns server, and the update... (7 Replies)
Discussion started by: earlysame55
7 Replies

10. IP Networking

multiple arp replies

Can someone tell me if I tweak the destination field in an arp request for TCP connection to match it with the the mac addresses of different recivers in an ethernet as the packet passes through them in short each one catches the arp request and replies, what would happen I mean will the sender of... (2 Replies)
Discussion started by: Rakesh Ranjan
2 Replies
Login or Register to Ask a Question