[c-nsp] ICMP Mask Requests on 6500

[John Neiberger]

In our case they are broadcast requests. I'm 99.9% sure it's a bug
since we can see the requests coming in but the 6504 does not reply.
If we move the connection over to an old 7513 (is that redundant?) all
is well.

On Fri, Jan 7, 2011 at 3:19 PM,  <Christopher.Marget at usc-bt.com> wrote:
> Solaris 8 used ICMP mask requests as a part of the jumpstart process.  Newer versions might also.
>
> But they didn't send requests to a router, they sent directed requests to the jumpstart server IIRC.
>
> /chris
>
>> -----Original Message-----
>> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
>> bounces at puck.nether.net] On Behalf Of John Neiberger
>> Sent: Friday, January 07, 2011 5:10 PM
>> To: cisco-nsp at puck.nether.net
>> Subject: [c-nsp] ICMP Mask Requests on 6500
>>
>> This is an interesting one. I have a TAC case open, but I thought I'd
>> check to see if anyone had ever seen this before. We had some old
>> equipment that uses ICMP mask requests to get its subnet information.
>> When this equipment is connected to an old 7513 running 11.1 code, the
>> router replies to the mask request with an ICMP mask reply. When we
>> move that device to a 6513 (Sup720, 12.2 code) we can see the mask
>> request come in, but the 6500 never sends a reply. According to Cisco,
>> the code to do the reply is in the IOS, 12.2(18)SXF9, so it must be a
>> bug. However, it also didn't work in 12.2(33)SXI5.
>>
>> I'm beginning to think the code is actually being deprecated since no
>> one really uses this feature any more. Have any of you ever had to
>> deal with ICMP mask requests and replies before?
>>
>> Thanks!
>> John
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>