[c-nsp] Strange behavior with 12008

[Erica]

Thanks, I'll have them check their config.  My annoucement is correct, but I
didn't think to look at their annoucements.

Erica

On 1/19/06, Dan Martin <dmartin at micromuse.com> wrote:
>
> you have a net mask somewhere that is almost right is my guess.  Is
> somebody summarizing your announcement?  make sure its right.
>
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Erica
> Sent: Thursday, January 19, 2006 2:42 PM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] Strange behavior with 12008
>
> Hi All
>
> Here's the situation.  Last week we suddenly lost connectivity to a
> website
> on provider A's network.  When we started investigating the issue we
> discovered that when they were trying to talk to us, they were stopped
> at
> our providers router, with what looked like a ACL blocking traffic from
> that
> particular IP.  We checked through all the ACL's on the interface and
> found
> nothing that should be blocking their IP's.  More investigation has
> found
> that we can get to all odd IP addresses in their blocks, but none of the
> even IP addresses.  For example, xxx.xxx.xxx.66 is not accesible to us,
> but
> xxx.xxx.xxx.67 is.  The route path also is currently symmetrical.  The
> router in question that we are passing through is a 12008 running 12.0
> (28)
> S with several GE-GBIC-SC-B= cards.
>
> My provider is completely stumped, as no one they know has ever seen
> this
> type of behavior.  I thought I would help them out and see if anyone
> here
> had come across this type of thing before.
>
> Many thanks for your input.
>
> Erica
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