RE: Website contact for www.cisco.com

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1

I also ran into this problem yesterday, I contacted Cisco and
they said that they were not block any of my addresses or ranges which I
found to be strange since from what I could tell out of an entire /22
only one IP address was affected. As of around 0500 PDT this morning I
was able to access Cisco's website again though.

Chris Burton
Network Engineer
Walt Disney Internet Group - Network Services

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2

Burton, Chris wrote:

I also ran into this problem yesterday, I contacted Cisco and
they said that they were not block any of my addresses or ranges which I
found to be strange since from what I could tell out of an entire /22
only one IP address was affected. As of around 0500 PDT this morning I
was able to access Cisco's website again though.

"Content switching", when partially broken, can do fancy effects.

Pete

3

Or CEF/DCEF if a linecard 'loses' a forwarding entry.

4

joe mcguckin wrote:

Or CEF/DCEF if a linecard 'loses' a forwarding entry.

Would that affect just one /32 out of a /22 if the subnet is not directly connected?
(it probably would if you run some kind of ACL's that require flow state to be retained, but other than that, it should not)
Obviously load balancers count as content switching devices which can also cause random brokenness.

Pete