[c-nsp] Monday morning brain teaser

[John Neiberger]

This has been confirmed as a known bug. I can't believe I haven't run into
it before. We're running this same code on several routers and I've never
noticed it. I guess that's yet another reason to upgrade.  :)


On Mon, Apr 1, 2013 at 10:39 AM, John Neiberger <jneiberger at gmail.com>wrote:

> 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
>>> >
>>> >
>>> _______________________________________________
>>> cisco-nsp mailing list  cisco-nsp at puck.nether.net
>>> https://puck.nether.net/mailman/listinfo/cisco-nsp
>>> archive at http://puck.nether.net/pipermail/cisco-nsp/
>>>
>>
>>
>