[j-nsp] ssb NH: resolutions from x throttled

[Alex]

I am sure You realise "proxy-arp" is an ARP Response function:

Warning: If you configure unrestricted proxy ARP, the proxy router replies 
to ARP requests for the target IP address on the same interface as the 
incoming ARP request.
http://www.juniper.net/techpubs/software/junos/junos90/swconfig-network-interfaces/configuring-unrestricted-proxy-arp.html

So if You have another JUNOS box sitting on the same PE-CE subnet with M20, 
and M20 has traffic coming in from its core-facing interface and addressed 
to unassigned IP addresses on said subnet, You can always configure 
"proxy-arp" on that other JUNOS box in order to respond to M20 and keep poor 
old M20 happy...

Cheers
Alex

----- Original Message ----- 
From: <juniper at iber-x.com>
To: "Christoph Blecker" <admin at toph.ca>; <juniper-nsp at puck.nether.net>
Sent: Monday, May 17, 2010 10:45 AM
Subject: Re: [j-nsp] ssb NH: resolutions from x throttled


Hello,

Yes, we had read this upgrade recomendation but we are looking for an
alternative solution. How I said, we read that there is a possibility to
set a 'proxy-arp' option for a particular interface
(http://www.juniper.net/techpubs/software/junos/junos90/swconfig-network-interfaces/configuring-unrestricted-proxy-arp.html)
and maybe it exists a statement for the opposite because we think that
perhaps it will solve the 'problem'.

Set this statement is only one idea (probably it doesn't work) but, does
anyone have another idea?

Thanks for your help and time,


El 17/05/2010 10:18, Christoph Blecker escribió:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Hello,
> The issue appears to be a bug in the JUNOS version you are running. A
> quick Google search turned up the following:
>
> http://www.juniper.net/techpubs/software/junos/junos73/rn-sw-73/previous-releases.html
>
> "If a router receives rapid multicast traffic from various groups or
> sources that do not have entries in the forwarding table, the router
> might generate the ?router-name feb NH: resolutions from iif number
> throttled? system log message and might delay the installation of
> forwarding table entries for some of these multicast packets. [PR/46474:
> This issue has been resolved.]"
>
> Solution would be to review your hardware and upgrade your JUNOS version
> as applicable. ARP resolution is a normal and necessary funtion of the
> router, and you would not want to disable it (I'm not even sure there
> *is* a way to disable it withing JUNOS).
>
> Cheers,
> - -Christoph
>
> On 10-05-17 01:43 AM, juniper at iber-x.com wrote:
>
>> Hi there,
>>
>> We have a Juniper M20 with JUNOS 7.3R1.4, old version :( .. and since
>> few we have in our log these entries:
>>
>> May 10 23:49:48.177 2010  xxxxx ssb NH: resolutions from iif 73 throttled
>> May 10 23:50:41.168 2010  xxxxx ssb NH: resolutions from iif 88 throttled
>> ..
>>
>> Someone told us that maybe was a  port/ip scan on an Ethernet subnet and
>> this causes a flood of ARP requests.
>> We found that there is a statement to set the 'proxy-arp' option:
>>
>> [edit]
>> user at host# set interfaces interface-name unit logical-unit-number 
>> proxy-arp
>>
>> But we can't find the opposite statement, I mean that the router doesn't
>> register any arp resolution in one interface.
>>
>> Also we read that it was a problem [PR/46474] solved since the version
>> 7.3R3 but we have an older JUNOS version..
>>
>> Does anyone know how to solve this 'problem'?
>>
>> Thanks in advance,
>>
>>
>>
>> _______________________________________________
>> juniper-nsp mailing list juniper-nsp at puck.nether.net
>> https://puck.nether.net/mailman/listinfo/juniper-nsp
>>
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