[wplug] Clearing arp cache

[Greg Simkins]

Thanks, Brandon.  The cat /proc/net/arp was helpful.  It gave me a better
view of arp cache than did the arp -a command.  The latter gave me an
unknown MAC address whereas the former gave me a valid MAC.  But, neither
showed any difference after the ip neigh flush all command.  I captured the
screen, but I can't send it to you because I am still trying to figure out
Samba.  

 

 

 

Greg Simkins

Pittsburgh, PA

Phone:  412-341-7926

FAX:  412-341-0790

Mobile:  412-478-2892

 

-----Original Message-----
From: Poyner, Brandon [mailto:wplug-bounces+gregsim=telerama.com at wplug.org]
On Behalf Of Poyner, Brandon
Sent: Monday, July 19, 2004 7:28 AM
To: General user list
Subject: RE: [wplug] Clearing arp cache

 

When you try the 'ip neigh flush all' what does 'arp -a' and 'cat
/proc/net/arp' respond with?  It's possible the cache is flushed but you're
seeing residual entries that show the IP address but do not have the mac
address.

-----Original Message----- 
From: Greg Simkins [mailto:gregsim at telerama.com] 
Sent: Mon 7/19/2004 6:30 AM 
To: 'General user list' 
Cc: 
Subject: RE: [wplug] Clearing arp cache 

I want to thank all those that offered helpful suggestions and comments
regarding the arp cache issue.  The discussion has been very interesting.
But, I have not been able to clear the cache. 

I tried the ip neigh flush all. 

I got the command line back suggesting that the command executed OK, but
when I then entered arp -a, the arp cache remained unchanged. 

Is there something else I need to do to ensure that the ip command is
working properly? 

Is there some way to use a wild card to name all hosts so that

arp -d <wildcard>

would work? 

arp -d <specific host name>

works OK to clear the named host from the cache. 

Greg Simkins
Pittsburgh, PA
Phone:  412-341-7926
FAX:  412-341-0790
Mobile:  412-478-2892


-----Original Message-----
From: wplug-bounces+gregsim=telerama.com at wplug.org
[mailto:wplug-bounces+gregsim=telerama.com at wplug.org] On Behalf Of Brian
Sammon
Sent: Wednesday, July 14, 2004 2:37 PM
To: General user list
Subject: Re: [wplug] Clearing arp cache

> It's completely possible, looking at the arp.c sources from FreeBSD and
> net-tools (Linux), to make arp -d -a work in Linux.  However I suspect
> the real reason it hasn't been implemented in net-tools' arp is because
> there is another command to flush the arp cache:
>
>       ip neigh flush all

What package is the "ip" command in?  I don't seem to have it on my
computer.


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