[c-nsp] issues with 6500 platform

[Jason Cardenas]

Good day, Cisco-NSP!

We've ran into an odd issue with Cisco 6504 with SUP720-3BXL running
122-33.SXH.

A system (or systems) with multiple IP addresses, same MAC or different MACs
for all IP addresses getting unusually slow download speeds and it seems to
be src-ip related.

#1 IP: xx.xx.xx.31 ; wget from a remote host grabs a file @ 8-10M/s speed
(optimal speed, let's pretend)
#2 IP: xx.xx.xx.32 ; @ 300K/s identical file - [FreeBSD ISO (432M)]
#3 IP: xx.xx.xx.33 ; @ 800K/s identical file, etc

We isolated this to a specific device, our core Cisco 6504. Forcing outgoing
traffic to go via alternative transit providers did not change overall
picture. Upstreams are not saturated in any way. Transfer rates stay at the
same levels for the above IP addresses. It looks like that across our entire
network. Pretty random stuff. Changing OS on the server - no change.
Changing MACs - no change either.

We also tried to wget from different locations as well, in terms of the
speed everything stays the same across all of the above IP addresses. We're
positive that this is related to src-ip.

Yet, what's weird is that within our internal network download speeds
80-90M/s+ are easily achieved from same IPs that are 'slow' from the
outside!

Could it be QoS-related, ISO bug? What else could it be?

Please, let me know what other information may be required to solve this
mystery. Thanks!

Jason