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TCP/IP utilities - If use the ARP -a

By frankk ·
Why I did not see all the servers in my network when using above command?
All of it does have static addressess.

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by Mehul Bhai In reply to TCP/IP utilities - If use ...

The ARP command gives the address resolution of the Machines which are at present communicating or communicated sometime back (sessions) with the computer from where you gave the ARP command.

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by Mehul Bhai In reply to

actually I ment simply "arp -a" command.

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by federico In reply to

Two considerations:
With arp -a you can see only the host that are on the same subnet/network.
The entries will clear up after some time.
Regards.

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by federico In reply to

Two considerations:
With arp -a you can see only the host that are on the same subnet/network.
The entries will clear up after some time.
Regards.

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by Nico Baggus In reply to TCP/IP utilities - If use ...

Unless you add the entries by hand (don't do
this..., unless you really need it.. (f.e. for a
printer/modem/router that needs reverse arp for
it's initial address) all entries will timeout
within mostly 1 minute after not being used.
So only the really active entries go in that
table. (think about it, you need to search that
table for EVERY packet that leaves your system
to another system. If there is no entry an ARP
resolution will provide it.
If you keep all possible entries in there and
you have thousands of entries you have to search
through all of them, wile you only communicate
with 1 or two systems actively.

Also some failover mechanisms use arp resolution
to provide automatic failover for one IP address
through two or more Ethernet ports, then there
would be no point in having all entries on your
host.

Kind Regards,

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