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From: Antonio Pinizzotto <antonio.pinizzotto@iit.cnr.it>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] problem with the "arp" command (using the pub flag)
Date: Thu, 02 Jun 2005 09:02:47 +0000	[thread overview]
Message-ID: <429ECB37.1060104@iit.cnr.it> (raw)
In-Reply-To: <428A218F.4010902@iit.cnr.it>


I've monitored the status of the arp table using
"arp -n"
and
"cat /proc/net/arp"
at the same time (for a long time, every 1 second).

The strange thing that I have found is that sometimes, in the "arp -n", 
the publishing entry (P flag) is missing, while in the "cat 
/proc/net/arp"  it is always present.
I have no idea why it happens, but I suppose (and hope :)) that if the 
entry is  present in the "cat /proc/net/arp" output then the arp proxy 
behavious is ok.

Is it right?

Antonio



Arkadiusz Binder wrote:
> and what shows 
> #ip ro sh cache
> ?
> It might be that you have not arp of some host who respond for icmp and arp's in case of some recieved icmp redirect packet.
> 
> 
> 
> -----Original Message-----
>     From: "gypsy"<gypsy@iswest.com>
>     Sent: 05-05-18 05:27:02
>     To: "Antonio Pinizzotto"<antonio.pinizzotto@iit.cnr.it>
>     Cc: "lartc@mailman.ds9a.nl"<lartc@mailman.ds9a.nl>
>     Subject: Re: [LARTC] problem with the "arp" command (using the pub flag)
>       Antonio Pinizzotto wrote:
>     >    ___PROBLEM___
>     > 
>     > The problems is that, sometimes, the second line (the one with the P
>     > Flag in the "arp -n" output) desappears for some time and then appears
>     > again... !!?
>     > 
>     > Note.
>     > Do you know if it is normal or if it could be a bug in "arp"?
>     > I didn't verify if, when the second line is not present, the host A
>     > continues to answer to ARP Request for 192.168.30.130 on eth0.
>     > In other words I didn't verify if it's just a problem in the output (of
>     > "arp -n" command) and not in the behaviour.
>     > 
>     > Antonio
>     
>     You got Trouble, Antonio!
>     
>     I've been running for 2+ months with no "disappearing" PUB arps.  arp -n
>     works flawlessly.
>     
>     Wondering:  Could it be a bad NIC or cable?
>     --
>     gypsy

> 


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      parent reply	other threads:[~2005-06-02  9:02 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-05-17 16:53 [LARTC] problem with the "arp" command (using the pub flag) Antonio Pinizzotto
2005-05-18  3:27 ` gypsy
2005-05-18  7:41 ` Arkadiusz Binder
2005-06-02  9:02 ` Antonio Pinizzotto [this message]

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