ARP requests on my net?

[Edward Krack]

 Mike McCarty: 

> I've been watching my LAN using tcpdump, and noticed
> that ARP is running repeatedly on my FC2 machine, and
> wonder why.

ARP is used by TCP/IP to resolve an IP address such as
172.17.205.79 to a unique hardware address, 00:11:95:0b:cc:28

Communicates between two computers on the same subnet as the host
server.

You can improve the connection speed to a server used most often is
to make the static entry in ARP cache.

Example:
router:~# arp -s 172.17.205.79 00:11:95:0b:cc:28
I think. That might be Windows.

arp -h      for help

Usage:
arp [-vn]  [<HW>] [-i <if>] [-a] [<hostname>]          <-Display ARP cache
arp [-v]          [-i <if>] -d  <hostname> [pub][nopub]   <-Delete ARP entry
arp [-vnD] [<HW>] [-i <if>] -f  [<filename>]     <-Add entry from file
arp [-v]   [<HW>] [-i <if>] -s  <hostname> <hwaddr> [temp][nopub] <-Add entry
arp [-v]   [<HW>] [-i <if>] -s  <hostname> <hwaddr> [netmask <nm>] pub  <-''-
arp [-v]   [<HW>] [-i <if>] -Ds <hostname> <if> [netmask <nm>] pub   <-''-

       -a                       display (all) hosts in alternative (BSD) style
       -s, --set                set a new ARP entry
       -d, --delete             delete a specified entry
       -v, --verbose            be verbose
       -n, --numeric            don't resolve names
       -i, --device             specify network interface (e.g. eth0)
       -D, --use-device         read <hwaddr> from given device
       -A, -p, --protocol       specify protocol family
       -f, --file               read new entries from file or from /etc/ethers


> Why should it care?

It has to know where to go. Can you drive cross country
without a road map?

I've read somewhere, to prevent ARP spoofing,
install a print server on the network.

Krack
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