Questions tagged [arp]
ARP (Address Resolution Protocol) is a protocol used to find an address from the link layer (Ethernet, for example) from the network layer address (such as an IP address).
26
questions
26
votes
5
answers
98k
views
how does 'ping' command really work?
How does the ping command really work? Specifically where does the ARP (Address Resolution Protocol) come into picture?
I was asked this question in an interview and I was not able to come up with ...
- 596
6
votes
2
answers
6k
views
What are the purposes of the addresses in this ARP table?
I've seen this on my Windows 7 computer, and searches have turned up others in Vista/7 who have seen the same. However, I've not yet found (or perhaps have just missed) a good explanation for this.
...
- 13.9k
69
votes
2
answers
123k
views
What is the difference between ARP binding and DHCP address reservation?
In my TL-WR1043ND I have these functionalities and both of them pair an IP address to a MAC address. What is the difference?
I read that ARP is for security reasons, others say it is for Wake-on-LAN. ...
- 5,264
9
votes
2
answers
147k
views
How to get device name from scan like nmap on Linux
I know that I can use a tool like NMAP or arp-scan on Linux to identify the IP and MAC addresses of all devices on my local network. I also know that arp-scan will do a MAC address lookup to get the ...
- 203
2
votes
1
answer
15k
views
What is the default cache refresh rate of Windows 8 and Ubuntu?
Since sending an ARP request/reply for each IP data-gram is inefficient, hosts maintain a cache (ARP Cache)of current entries. The entries expire after
What is the default ARP cache refresh rate of ...
- 131
-2
votes
2
answers
18k
views
What layer of the TCP/IP network does ARP belong to? [closed]
I'm working my way through the Sams teach yourself TCP/IP book and it say's that the Address Resolution Protocol belongs at the Internet layer.
Is this true?
Other sources claim it is a Network ...
- 121
32
votes
2
answers
144k
views
Windows 7: The ARP entry addition failed: Access is denied
I'm on Windows 7 and am trying to assign a static arp entry for my default gateway using the command:
arp -s 172.24.7.254 00-05-01-f9-28-00 172.24.1.20
But I get the following error:
The ARP ...
- 1,941
29
votes
2
answers
33k
views
Does the order of entries in the routing table matter?
Does the routing order matter:
> route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
123.x.x.151 0.0.0.0 255.255.255.255 UH ...
- 1,367
20
votes
1
answer
37k
views
Where is the ARP cache on Linux?
Where, in memory, does the ARP cache exist? I tried searching it up online but didn't find anything.
- 323
16
votes
3
answers
29k
views
what's IPv6 analogue for IPv4 `arp -an` and "arp who-has"?
In the IPv4 world, when you want to talk to another computer, you ask which MAC address claims a given IPv4 address, the arp who-has ... tell ... exchange as per tcpdump, and a cache of such mappings ...
- 2,475
11
votes
3
answers
45k
views
arp requesting to another subnet, how?
I’m wondering if I have a computer in subnet A with IP address 192.168.123.1, and a computer with IP address 192.168.124.1 in a different subnet.
Both networks are connected with a router. If I want ...
- 125
7
votes
3
answers
4k
views
Given a PC's MAC address, can I find its IP?
Is there a way to get the IP address when all you have is the MAC of an item?
- 544
7
votes
3
answers
13k
views
Detect IP Conflicts on Network
I have a Wireless WAN network that I am managing devices on. We recently had an IP conflict that took us over 10 months to find (we had no idea there was even a conflict until we were pinging a ...
- 289
5
votes
1
answer
853
views
Can someone explain how this happened?
I seem to be having some odd results when running netdiscover on my home network. From the cable modem to my scanner (skipping a few peripherals), here's the basic layout:
The cable modem is ...
- 13.9k
4
votes
3
answers
5k
views
What adds these Multicast IPs to the ARP table, as static entries?
(Similar to my previous question, but addressing a separate aspect which has gone unanswered.)
I've seen this on my Windows 7 computer, and searches have turned up others in Vista/7 who have seen the ...
- 13.9k