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Flushing the arp table

How do you flush the arp table.  Do you have to do it one entry at a time, or can you just ditch the whole thing at once?

Thanks,
Bret
0
badreece
Asked:
badreece
1 Solution
 
bhagawatulaCommented:
What OS?
On HPUX and Solaris :
try route -f
to flush the table.
I think you need to add your default route again after this.

-f Flush the routing tables of all  gateway  entries.
    If  this  is  used  in conjunction with one of the     commands described above, route  flushes the gate-ways before performing the command.  

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thacsiCommented:
arp -d hostname

You could build a wrapper script to first get all hostnames with arp -a and then remove them with arp -d.

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dsernaCommented:
What Unix are we talking about here? If you are interested to know on how to flush the arp table in Solaris, this is the way you would do it:

as root:

: root@ns:/export/home/dserna2: arp -a
Net to Media Table
Device   IP Address               Mask      Flags   Phys Addr
------ -------------------- --------------- ----- ---------------
le0    209.220.74.1         255.255.255.255       00:10:67:00:3f:80
le0    ns                   255.255.255.255 SP    08:00:20:75:e9:29
le0    BASE-ADDRESS.MCAST.NET 240.0.0.0       SM    01:00:5e:00:00:00
: root@ns:/export/home/dserna2: ifconfig -a
lo0: flags=849<UP,LOOPBACK,RUNNING,MULTICAST> mtu 8232
    inet 127.0.0.1 netmask ff000000
le0: flags=863<UP,BROADCAST,NOTRAILERS,RUNNING,MULTICAST> mtu 1500
    inet 209.220.74.121 netmask ffffff00 broadcast 209.220.74.255
    ether 8:0:20:75:e9:29
: root@ns:/export/home/dserna2: ifconfig le0 209.220.74.121 ; arp -a
Net to Media Table
Device   IP Address               Mask      Flags   Phys Addr
------ -------------------- --------------- ----- ---------------
le0    ns                   255.255.255.255 SP    08:00:20:75:e9:29
le0    BASE-ADDRESS.MCAST.NET 240.0.0.0       SM    01:00:5e:00:00:00
: root@ns:/export/home/dserna2:



I don't know about other Unix versions. Hope that helps.
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festiveCommented:
regardless of what version the following could be adapted:
 below should work for solaris on le0 interface

for arpent in `arp -a | grep "^le0" ` ; do
     arp -d $arpent
done

you could specify multiple/all interfaces by substituting grep with egrep and using the following:
egrep "^le0|^hme0|^net0"

etc...

0
 
festiveCommented:
regardless of what version the following could be adapted:
 below should work for solaris on le0 interface

for arpent in `arp -a | grep "^le0" | awk ''{ print $2 }' ` ; do
     arp -d $arpent
done

you could specify multiple/all interfaces by substituting grep with egrep and using the following:
egrep "^le0|^hme0|^net0"

etc...

0
 
festiveCommented:
regardless of what version the following could be adapted:
 below should work for solaris on le0 interface

for arpent in `arp -a | grep "^le0" | awk ''{ print $2 }' ` ; do
     arp -d $arpent
done

you could specify multiple/all interfaces by substituting grep with egrep and us
ing the following:
egrep "^le0|^hme0|^net0"

etc...
0
 
badreeceAuthor Commented:
That's going to work for me.
Thanks,
Bret
0

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