Re: ARP table notification

[Gilad Ben-Yossef]

Aviram Jenik wrote:
On Sunday 10 August 2003 09:42, Ran Milstein wrote:

Hi,
How can I get notification about a change in the ARP table ? is there a way
to register for a specific change ?
Search for arpwatch (comes with Redhat by default).

arpwatch is a daemon that uses pcap on the local Ethernet ports to 
listen for ARP packets and proccess them itself. It doesn't provide 
information on the internal ARP tables the kernel maintiains which Ran 
is intersted in.

You can get what you want by using netlink. man 7 rtnetlink and search 
for RTM_NEWNEIGH for the details.

And yes, it's supported in 2.2 :-)

Gilad



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Re: ARP table notification

[Gilad Ben-Yossef]

Ran Milstein wrote:
Actually what I mean is not a user space program that handles the ARP table
changes it self - I meant to ask if there is a way of getting notification
from Linux ARP table in the kernel.
man 7 rtnetlink:

Rtnetlink  allows  the  kernel's routing tables to be read and altered.
It is used within the kernel to communicate between various subsystems
Gilad :-)

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RE: ARP table notification

[Ran Milstein]

Actually what I mean is not a user space program that handles the ARP table
changes it self - I meant to ask if there is a way of getting notification
from Linux ARP table in the kernel.

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Aviram Jenik
Sent: Sunday, August 10, 2003 10:17 AM
To: Ran Milstein; Linux-Il
Subject: Re: ARP table notification


On Sunday 10 August 2003 09:42, Ran Milstein wrote:
 Hi,
 How can I get notification about a change in the ARP table ? is there a
way
 to register for a specific change ?

Search for arpwatch (comes with Redhat by default).

--
It was only a one liner. A semi-illiterate chipmunk could've written
it.  -- MBY about his 2.5.73 kernel patch in tpam_queues.c

- Aviram


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ARP table notification

[Ran Milstein]

Hi,
How can I get notification about a change in the ARP table ? is there a way
to register for a specific change ?

thanks,
Ran.


thanks,
Ran.

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