[c-nsp] Monday morning brain teaser

John Neiberger jneiberger at gmail.com
Mon Apr 1 12:39:12 EDT 2013


I'm leaning toward some sort of bug. I've expanded my testing and see that
any time I trace to something that is not replying, ICMP polls to the ASR9K
fail. As soon as I kill the failing trace, polling is immediately
successful.


On Mon, Apr 1, 2013 at 10:29 AM, John Neiberger <jneiberger at gmail.com>wrote:

> It should be sourced from the directly connected interface. I see nothing
> in the config that would cause it to be sourced from something else.
> However, this led to try a test that turned up something else really weird.
> If I ping the destination normally from Router A, the ping begins
> immediately. But if I ping the destination and source it from Router A's
> loopback0 interface, the ping waits about 7-8 seconds before it sends the
> pings. The RTT is the same, but there is always a 7-8 second pause after I
> hit enter if I source the pings from Loopback0. WTH? Something is very
> funky on this router.
>
>
> On Mon, Apr 1, 2013 at 10:10 AM, Harold 'Buz' Dale <buz.dale at usg.edu>wrote:
>
>> Is your traceroute sourced from a different IP?
>>
>> -----Original Message-----
>> From: cisco-nsp-bounces at puck.nether.net [mailto:
>> cisco-nsp-bounces at puck.nether.net] On Behalf Of John Neiberger
>> Sent: Monday, April 01, 2013 11:43
>> To: Rick Coloccia
>> Cc: cisco-nsp at puck.nether.net
>> Subject: Re: [c-nsp] Monday morning brain teaser
>>
>> I've verified that we have no policy maps or route maps in place. The
>> interfaces in question are plain L3 interfaces with barely more than an IP
>> address configured. I'm not nearly awake enough to deal with this sort of
>> weird behavior.  :)
>>
>>
>> On Mon, Apr 1, 2013 at 9:39 AM, Rick Coloccia <coloccia at geneseo.edu>
>> wrote:
>>
>> > On 4/1/2013 11:36 AM, John Neiberger wrote:
>> >
>> >> I honestly don't know what to think about this. I don't think I've
>> >> ever seen anything like it.
>> >>
>> > I didn't have an ACL in the way, but I did have a policy route map in
>> > place, which was a little too aggressive, one upon a time. Similar
>> > symptoms.  May be something to look at...
>> >
>> > --
>> > Rick Coloccia, Jr.
>> > Network Manager
>> > State University of NY College at Geneseo
>> > 1 College Circle, 119 South Hall
>> > Geneseo, NY 14454
>> > V: 585-245-5577
>> > F: 585-245-5579
>> >
>> >
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>
>


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